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digitalmars.D.bugs - [Issue 5278] New: DMD generates programs that immediately segfault.

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5278

           Summary: DMD generates programs that immediately segfault.
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: blocker
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: chadjoan gmail.com



My program is this:

void main() {}

My bash session looks like this:

$ dmd main.d -v
binary    dmd
version   v2.050
config    /usr/local/share/dcompilers/dmd/linux/bin/dmd.conf
parse     main
importall main
import    object       
(/usr/local/share/dcompilers/dmd/linux/bin/../../src/druntime/import/object.di)
semantic  main
semantic2 main
semantic3 main
code      main
function  main
gcc main.o -o main -m32 -Xlinker
-L/usr/local/share/dcompilers/dmd/linux/bin/../lib -Xlinker --export-dynamic
-lphobos2 -lpthread -lm 
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld:
warning: creating a DT_TEXTREL in object.
$ ./main
Segmentation fault


I'm on 64-bit Gentoo Linux, though I am creating 32-bit executables like
normal.  This is a problem for dmd v2.050 and v2.049.  v2.048 runs just fine,
though it also makes the linker complain about "creating a DT_TEXTREL in
object."

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Additional note: as far as I can tell this afflicts ALL programs I write with
DMD, not just the trivial do-nothing program.

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Brad Roberts <braddr puremagic.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |braddr puremagic.com



---
Something looks wrong with your 32 bit gcc installation.  Notice that gcc is
invoking the 64 bit linker.  Can you successfully build any 32 bit C apps with
gcc?  I'm going to guess no.

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 Something looks wrong with your 32 bit gcc installation.  Notice that gcc is
 invoking the 64 bit linker.  Can you successfully build any 32 bit C apps with
 gcc?  I'm going to guess no.


Good thought.  I still seem to be able to build 32 bit C apps though:

chad Hugin ~/cprojects/ctesting $ gcc trivial.c -o trivial
chad Hugin ~/cprojects/ctesting $ file trivial
trivial: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically
linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
chad Hugin ~/cprojects/ctesting $ ./trivial
chad Hugin ~/cprojects/ctesting $ gcc trivial.c -m32 -o trivial
chad Hugin ~/cprojects/ctesting $ file trivial
trivial: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV),
dynamically linked (uses shared libs), for GNU/Linux 2.6.9, not stripped
chad Hugin ~/cprojects/ctesting $ ./trivial
chad Hugin ~/cprojects/ctesting $ cat trivial.c
int main(int argc, char *argv[])
{
        return 0;
}

I checked dmd 2.050 at the same time just to make sure this isn't because I
changed my system config.  It still produces segfaulting executables.  I have
encountered another program that I didn't expect to segfault but did: the Gish
demo (http://www.chroniclogic.com/gish_download.htm).  I don't know if it's
related because the segfault is such a terribly vague error and I don't feel
like learning how to disassemble executables again right now :/  If someone
wants to point me in the right directions to do that though, I wouldn't mind.

So hey, maybe there is something special about my system that makes things
crashy, but it'd be nice if the D executables could run on my system without
crashing like all of the other executables on my system that don't crash.

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---
Try "gcc -v trivial.c -m32 -o trivial" to see which linker is being invoked in
the working 32 bit case.

Also try "gcc -v trivial.c -o trivial -m32" to closer match the way dmd is
invoking gcc.  Which linker is being invoked now?

I just tried those experiments on my box, and both forms correctly built 32 bit
binaries.

Another thing to do to try to gather more information, on the dmd command line,
add: -L-v.  That should be enough to show that collect2 is being invoked with
-m elf_i386.  For even more details, try running dmd with: -L-v -L-Wl,-v.  That
will add another -v down at the ld command which will give even more output,
showing that ld is being invoked with -m elf_i386 as well.

I assure you that dmd produces proper 32 bit executables on my linux x86_64
box.  So, the exercise here is to figure out what's different, why, and how to
resolve it.

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Alright, here goes:

chad Hugin ~/cprojects/ctesting $ gcc -v trivial.c -m32 -o trivial
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/specs
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-4.3.2-r3/work/gcc-4.3.2/configure --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.3.2
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --enable-nls --without-included-gettext
--with-system-zlib --disable-werror --enable-secureplt --enable-multilib
--enable-libmudflap --disable-libssp --disable-libgomp
--enable-checking=release --disable-libgcj --enable-languages=c,c++,treelang
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --with-bugurl=http://bugs.gentoo.org/
--with-pkgversion='Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5'
Thread model: posix
gcc version 4.3.2 (Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5) 
COLLECT_GCC_OPTIONS='-v' '-m32' '-o' 'trivial' '-mtune=generic'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/cc1 -quiet -v -imultilib 32
trivial.c -fPIE -fno-strict-overflow -quiet -dumpbase trivial.c -m32
-mtune=generic -auxbase trivial -version -o /tmp/cc4qEg6K.s
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include-fixed
 /usr/include
End of search list.
GNU C (Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5) version 4.3.2
(x86_64-pc-linux-gnu)
        compiled by GNU C version 4.3.2, GMP version 4.3.2, MPFR version
2.4.2-p3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: e8faf928abdbcb1acb2166e18d14ae3d
COLLECT_GCC_OPTIONS='-v' '-m32' '-o' 'trivial' '-mtune=generic'
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/as
-V -Qy --32 -o /tmp/ccEd2Qcf.o /tmp/cc4qEg6K.s
GNU assembler version 2.20.1 (x86_64-pc-linux-gnu) using BFD version (GNU
Binutils) 2.20.1.20100303
COMPILER_PATH=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/:/lib/../lib32/:/usr/lib/../lib32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-m32' '-o' 'trivial' '-mtune=generic'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/collect2 --eh-frame-hdr -m elf_i386
-dynamic-linker /lib/ld-linux.so.2 -pie -z now -o trivial
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32
-L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. /tmp/ccEd2Qcf.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o
chad Hugin ~/cprojects/ctesting $ ./trivial
chad Hugin ~/cprojects/ctesting $








chad Hugin ~/cprojects/ctesting $ gcc -v trivial.c -o trivial -m32
Reading specs from /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/specs
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-4.3.2-r3/work/gcc-4.3.2/configure --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/4.3.2
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/4.3.2/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include/g++-v4
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --disable-altivec
--disable-fixed-point --enable-nls --without-included-gettext
--with-system-zlib --disable-werror --enable-secureplt --enable-multilib
--enable-libmudflap --disable-libssp --disable-libgomp
--enable-checking=release --disable-libgcj --enable-languages=c,c++,treelang
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --with-bugurl=http://bugs.gentoo.org/
--with-pkgversion='Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5'
Thread model: posix
gcc version 4.3.2 (Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5) 
COLLECT_GCC_OPTIONS='-v' '-o' 'trivial' '-m32' '-mtune=generic'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/cc1 -quiet -v -imultilib 32
trivial.c -fPIE -fno-strict-overflow -quiet -dumpbase trivial.c -m32
-mtune=generic -auxbase trivial -version -o /tmp/cckuthAp.s
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/local/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/include-fixed
 /usr/include
End of search list.
GNU C (Gentoo Hardened 4.3.2-r3 p1.6, pie-10.1.5) version 4.3.2
(x86_64-pc-linux-gnu)
        compiled by GNU C version 4.3.2, GMP version 4.3.2, MPFR version
2.4.2-p3.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: e8faf928abdbcb1acb2166e18d14ae3d
COLLECT_GCC_OPTIONS='-v' '-o' 'trivial' '-m32' '-mtune=generic'
 /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/as
-V -Qy --32 -o /tmp/cceQ7W8N.o /tmp/cckuthAp.s
GNU assembler version 2.20.1 (x86_64-pc-linux-gnu) using BFD version (GNU
Binutils) 2.20.1.20100303
COMPILER_PATH=/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/libexec/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/:/lib/../lib32/:/usr/lib/../lib32/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib/:/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '-o' 'trivial' '-m32' '-mtune=generic'
 /usr/libexec/gcc/x86_64-pc-linux-gnu/4.3.2/collect2 --eh-frame-hdr -m elf_i386
-dynamic-linker /lib/ld-linux.so.2 -pie -z now -o trivial
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32
-L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. /tmp/cceQ7W8N.o -lgcc
--as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o
chad Hugin ~/cprojects/ctesting $ ./trivial
chad Hugin ~/cprojects/ctesting $




chad Hugin ~/dprojects/dtesting $ dmd trivial.d -L-v
collect2 version 4.3.2 (x86-64 Linux/ELF)
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld
--eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -pie -z now -o
trivial /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32
-L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. trivial.o -v
-L/usr/local/share/dcompilers/dmd/linux/bin/../lib --export-dynamic -lphobos2
-lpthread -lm -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed
-lgcc_s --no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o
GNU ld (GNU Binutils) 2.20.1.20100303
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld:
warning: creating a DT_TEXTREL in object.
chad Hugin ~/dprojects/dtesting $ ./trivial
Segmentation fault


The -L-Wl,-v flag doesn't seem to work:

chad Hugin ~/dprojects/dtesting $ dmd trivial.d -L-v -L-Wl,-v
collect2 version 4.3.2 (x86-64 Linux/ELF)
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld
--eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -pie -z now -o
trivial /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32
-L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. trivial.o -v -Wl,-v
-L/usr/local/share/dcompilers/dmd/linux/bin/../lib --export-dynamic -lphobos2
-lpthread -lm -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed
-lgcc_s --no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o
GNU ld (GNU Binutils) 2.20.1.20100303
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld:
unrecognized option '-Wl,-v'
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld:
use the --help option for usage information
collect2: ld returned 1 exit status
--- errorlevel 1

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---
Does this bug report shed any light, specifically the part about changing the
CHOST towards the bottom of the report?  (I'm not a gentoo user, just using
google to investigate similar issues).

    http://bugs.gentoo.org/show_bug.cgi?id=332663

If that's not it, then I'm running out of obvious things to check.

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 Does this bug report shed any light, specifically the part about changing the
 CHOST towards the bottom of the report?  (I'm not a gentoo user, just using
 google to investigate similar issues).
 
     http://bugs.gentoo.org/show_bug.cgi?id=332663
 
 If that's not it, then I'm running out of obvious things to check.


I'm afraid not.  I haven't changed my CHOST; it's "x86_64-pc-linux-gnu" like
always.

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22:21:57 PST ---

 I don't know if it's
 related because the segfault is such a terribly vague error and I don't feel
 like learning how to disassemble executables again right now


If dmd can generate debug info, you shouldn't need to disassemble. At least
you'll know, where it crashes.

d2 is a sophisticated system, it can use nifty functions in trivial cases.
AFAIK, Gentoo is compiled from the source, did you use any special options like
strong optimization etc?

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 I don't know if it's
 related because the segfault is such a terribly vague error and I don't feel
 like learning how to disassemble executables again right now


 
 If dmd can generate debug info, you shouldn't need to disassemble. At least
 you'll know, where it crashes.
 
 d2 is a sophisticated system, it can use nifty functions in trivial cases.
 AFAIK, Gentoo is compiled from the source, did you use any special options like
 strong optimization etc?


For DMD I just grab the binary releases.  I've never been very confident in the
D-related ebuilds :(

As for my system configuration and its optimization, I don't think I have
anything too exotic.  Here are my CFLAGS:
CFLAGS="-march=nocona -O2 -finline-functions -fgcse-after-reload -pipe"

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So I thought it'd be wise to try it with both the working compiler version and
the not working compiler version and see what changed in the linker string.
Here it is:

chad Hugin /mnt/sharedhd/dprojects/dtesting $ dmd trivial.d -L-v 2>
dmd2048.link
GNU ld (GNU Binutils) 2.20.1.20100303
chad Hugin /mnt/sharedhd/dprojects/dtesting $ dmd trivial.d -L-v 2>
dmd2050.link
GNU ld (GNU Binutils) 2.20.1.20100303
chad Hugin /mnt/sharedhd/dprojects/dtesting $ diff dmd2048.link dmd2050.link 
2c2
< /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld
--eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -pie -z now -o
trivial /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32
-L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. trivial.o -v
-L/usr/local/share/dcompilers/dmd/linux/bin/../lib -lphobos2 -lpthread -lm
-lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
--no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o
---

 /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld
--eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -pie -z now -o
trivial /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32
-L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. trivial.o -v
-L/usr/local/share/dcompilers/dmd/linux/bin/../lib --export-dynamic -lphobos2
-lpthread -lm -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed
-lgcc_s --no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o



Note the that --export-dynamic is only present in the one that segfaults.  
I'm in a bit of a rush at the moment and I don't remember how to mess with
--export-dynamic, so that's all for now.

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 So I thought it'd be wise to try it with both the working compiler version and
 the not working compiler version and see what changed in the linker string.
 Here it is:
 
 ...


Whoops, diff formatting messed things up on that second line.  Here it is
again, minus the angle brackets:

-------------- dmd 2.048 --------------
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld
--eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -pie -z now -o
trivial /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32
-L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. trivial.o -v
-L/usr/local/share/dcompilers/dmd/linux/bin/../lib -lphobos2 -lpthread -lm
-lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s
--no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o

-------------- dmd 2.050 --------------
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/bin/ld
--eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -pie -z now -o
trivial /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/Scrt1.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crti.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtbeginS.o
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32 -L/lib/../lib32
-L/usr/lib/../lib32 -L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../x86_64-pc-linux-gnu/lib
-L/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../.. trivial.o -v
-L/usr/local/share/dcompilers/dmd/linux/bin/../lib --export-dynamic -lphobos2
-lpthread -lm -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed
-lgcc_s --no-as-needed /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/32/crtendS.o
/usr/lib/gcc/x86_64-pc-linux-gnu/4.3.2/../../../../lib32/crtn.o

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Vladimir <thecybershadow gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |thecybershadow gmail.com



PST ---
I just thought I'd mention that I had some similar problems with DMD on Gentoo
due to bad permissions of certain libraries. Do your programs run under root?
If so, check permissions for libphobos and whatever 32-bit libraries your
program / libphobos uses (glibc? libstdc++?).

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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I have taken another crack at this.

After some compiling of D on a roommate's non-hardened Gentoo system I found
that if I recompile my gcc without the hardened useflag and then compile my D
programs, the D programs won't segfault.  This round of testing was done with
64-bit DMD.  

In short: using hardened GCC will trigger this.

I was pointed in this direction by observing the last line of the output of
compiling with dmd -v:
gcc main.o -o main -m64 -Xlinker
-L/usr/local/share/dcompilers/dmd/linux/bin64/../lib64 -Xlinker
-L/usr/local/share/dcompilers/dmd/linux/bin64/../lib32 -Xlinker
--no-warn-search-mismatch -Xlinker --export-dynamic -lrt -lphobos2 -lpthread
-lm 

Notably, it is using gcc for its linking step.

After a bit of browsing in the DMD sources, a workaround presents itself.  DMD
just uses the CC environment variable to determine what to use for linking, so
it is possible to build an isolated non-hardened GCC and then use that to
compile D programs.  It would look like this:
CC=custom-gcc dmd -v main.d -ofmain

At some point I may bisect the older changes in DMD to find out where this
regression was introduced.  I can see this ending up in the backend though, so
I'm not sure I'll be able to understand the code I end up in.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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 I just thought I'd mention that I had some similar problems with DMD on Gentoo
 due to bad permissions of certain libraries. Do your programs run under root?
 If so, check permissions for libphobos and whatever 32-bit libraries your
 program / libphobos uses (glibc? libstdc++?).


I almost forgot to mention this...

My programs still segfault under root.

Permissions are fine.

Everything works if I use a non-hardened GCC.

Thanks for the suggestions!

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Brad Roberts <braddr puremagic.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|DMD generates programs that |gentoo's 'hardended' gcc
                   |immediately segfault.       |doesn't work with dmd



PDT ---
I recall some changes going in that addressed some hardening issues along the
way.  I don't have a gentoo based system to test this on.  Please try the most
recent beta to see if the problem still exists.

http://ftp.digitalmars.com/dmd2beta.zip

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I'm afraid it doesn't seem to be working.

It went something like this:

chad Hugin /mnt/bulk/dprojects/helloD2 $ ls
main.d
chad Hugin /mnt/bulk/dprojects/helloD2 $ cat main.d
import std.stdio;

void main()
{
        writefln("hello world!");
}
chad Hugin /mnt/bulk/dprojects/helloD2 $ dmd
DMD64 D Compiler v2.056
Copyright (c) 1999-2011 by Digital Mars written by Walter Bright
Documentation: http://www.digitalmars.com/d/2.0/index.html
Usage:
  dmd files.d ... { -switch }

  files.d        D source files
   cmdfile       read arguments from cmdfile
  -c             do not link
  -cov           do code coverage analysis
  -D             generate documentation
  -Dddocdir      write documentation file to docdir directory
  -Dffilename    write documentation file to filename
  -d             allow deprecated features
  -debug         compile in debug code
  -debug=level   compile in debug code <= level
  -debug=ident   compile in debug code identified by ident
  -debuglib=name    set symbolic debug library to name
  -defaultlib=name  set default library to name
  -deps=filename write module dependencies to filename
  -fPIC          generate position independent code
  -g             add symbolic debug info
  -gc            add symbolic debug info, pretend to be C
  -gs            always emit stack frame
  -H             generate 'header' file
  -Hddirectory   write 'header' file to directory
  -Hffilename    write 'header' file to filename
  --help         print help
  -Ipath         where to look for imports
  -ignore        ignore unsupported pragmas
  -inline        do function inlining
  -Jpath         where to look for string imports
  -Llinkerflag   pass linkerflag to link
  -lib           generate library rather than object files
  -man           open web browser on manual page
  -map           generate linker .map file
  -noboundscheck turns off array bounds checking for all functions
  -nofloat       do not emit reference to floating point
  -O             optimize
  -o-            do not write object file
  -odobjdir      write object & library files to directory objdir
  -offilename    name output file to filename
  -op            do not strip paths from source file
  -profile       profile runtime performance of generated code
  -property      enforce property syntax
  -quiet         suppress unnecessary messages
  -release       compile release version
  -run srcfile args...   run resulting program, passing args
  -unittest      compile in unit tests
  -v             verbose
  -version=level compile in version code >= level
  -version=ident compile in version code identified by ident
  -vtls          list all variables going into thread local storage
  -w             enable warnings
  -wi            enable informational warnings
  -X             generate JSON file
  -Xffilename    write JSON file to filename
chad Hugin /mnt/bulk/dprojects/helloD2 $ dmd main.d -ofmain
/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/../../../../x86_64-pc-linux-gnu/bin/ld:
main.o: relocation R_X86_64_32 against `.data' can not be used when making a
shared object; recompile with -fPIC
main.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
--- errorlevel 1
chad Hugin /mnt/bulk/dprojects/helloD2 $ ls
main.d  main.o
chad Hugin /mnt/bulk/dprojects/helloD2 $ dmd main.d -ofmain -m32
/usr/lib/gcc/x86_64-pc-linux-gnu/4.4.5/../../../../x86_64-pc-linux-gnu/bin/ld:
warning: creating a DT_TEXTREL in object.
chad Hugin /mnt/bulk/dprojects/helloD2 $ ls
main  main.d  main.o
chad Hugin /mnt/bulk/dprojects/helloD2 $ main
main: error while loading shared libraries: cannot make segment writable for
relocation: Permission denied
chad Hugin /mnt/bulk/dprojects/helloD2 $ sudo paxctl -m main
chad Hugin /mnt/bulk/dprojects/helloD2 $ main
Segmentation fault
chad Hugin /mnt/bulk/dprojects/helloD2 $ ls
main  main.d  main.o
chad Hugin /mnt/bulk/dprojects/helloD2 $


(I don't have any other 2.056 D compilers on my system; so the part where I ran
dmd to get the help text should confirm that the correct compiler is in use.)

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Created an attachment (id=1043)
More detailed info of dmd run on hardened gentoo 64-bit.

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Here is the output of dmd -v for both 32-bit (-m32) and 64-bit runs, just
in-case it helps.

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Well, I tried bisecting dmd to find which change caused this.  It didn't work
because this problem does not care which version of dmd I am using, it cares
which RELEASE I am using.

I narrowed it down to the "-L--export-dynamic" flag in 
$DPATH/linux/bin64/dmd.conf

If I remove that export-dynamic flag AND rebuild druntime/phobos from scratch,
everything is fine.  

Of course, if I remove -L--export-dynamic AND I do NOT rebuild druntime/phobos
from scratch, I get this:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.3/../../../../x86_64-pc-linux-gnu/bin/ld:
main.o: relocation R_X86_64_32 against `.data' can not be used when making a
shared object; recompile with -fPIC
main.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
--- errorlevel 1

I take it this means that the executable and the library must agree on whether
or not to use -L--export-dynamic.  I guess it makes sense.

By removing -L--export-dynamic and building dmd/druntime/phobos all from git at
v2.057, I was able to get the recent release of dmd to run on my machine
without using a special GCC.

Any chance we can remove -L--export-dynamic or fix it so that it does not do
this?  (I have no idea how to fix it, but removing it is easy enough!)

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dawg dawgfoto.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dawg dawgfoto.de



The core issue is that your gcc is linking PIE by default but
PIC support for dmd still has some bug and probably would need
more that -fPIC to support PIE. Currently you should pass
-fno-pie to gcc for linking.

Please help to find out why --export-dynamic is involved.
Does it trigger alter the PIE behavior?
What's the backtrace of your segfault core dumps?
Please list any linker warnings you get
(-Wl,--verbose for gcc or -L--verbose for dmd).

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 The core issue is that your gcc is linking PIE by default but
 PIC support for dmd still has some bug and probably would need
 more that -fPIC to support PIE. Currently you should pass
 -fno-pie to gcc for linking.
 
 Please help to find out why --export-dynamic is involved.
 Does it trigger alter the PIE behavior?


How do I find this out?


 What's the backtrace of your segfault core dumps?


Also, how do I find this out?
Running the program just makes it print "Segmentation fault"; there is no
backtrace for me to copy.  Maybe I am missing something (where would I find a
core dump for this?).


 Please list any linker warnings you get
 (-Wl,--verbose for gcc or -L--verbose for dmd).


Stock DMD v2.057
64-bit:
chad Hugin /mnt/bulk/dprojects/helloD2 $ which dmd
/usr/local/share/dcompilers/dmd/linux/bin64/dmd

chad Hugin /mnt/bulk/dprojects/helloD2 $ cat main.d
import std.stdio;

void main()
{
        writefln("hello world!");
}

Without -m32 it isn't able to compile my program:
http://pastebin.com/GqP5JC3z

With -m32 it does, but segfaults:
http://pastebin.com/hd5zEtD2

32-bit dmd:
chad Hugin /mnt/bulk/dprojects/helloD2 $ which dmd
/usr/local/share/dcompilers/dmd/linux/bin32/dmd

Segfaults:
http://pastebin.com/d7miSKtH

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What's linker flags are passed by gcc if you use --export-dynamic vs. not using
it?

dmd -c main
----------
gcc main.o -o main -m32 -Xlinker
-L/usr/local/share/dcompilers/dmd/linux/bin32/../lib32 -Xlinker
-L/usr/local/share/dcompilers/dmd/linux/bin32/../lib64 -Xlinker
--no-warn-search-mismatch -Xlinker --export-dynamic -lphobos2 -lpthread -lm
-lrt -v
----------
vs.
----------
gcc main.o -o main -m32 -Xlinker
-L/usr/local/share/dcompilers/dmd/linux/bin32/../lib32 -Xlinker
-L/usr/local/share/dcompilers/dmd/linux/bin32/../lib64 -Xlinker
--no-warn-search-mismatch -lphobos2 -lpthread -lm -lrt -v
----------

Also did passing -fno-pie to gcc resolve your problems?

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Thank you for clarifying.


 What's linker flags are passed by gcc if you use --export-dynamic vs. not using
 it?
 
 dmd -c main
 ----------
 gcc main.o -o main -m32 -Xlinker
 -L/usr/local/share/dcompilers/dmd/linux/bin32/../lib32 -Xlinker
 -L/usr/local/share/dcompilers/dmd/linux/bin32/../lib64 -Xlinker
 --no-warn-search-mismatch -Xlinker --export-dynamic -lphobos2 -lpthread -lm
 -lrt -v


http://pastebin.com/BD52Kkp2


 ----------
 vs.
 ----------
 gcc main.o -o main -m32 -Xlinker
 -L/usr/local/share/dcompilers/dmd/linux/bin32/../lib32 -Xlinker
 -L/usr/local/share/dcompilers/dmd/linux/bin32/../lib64 -Xlinker
 --no-warn-search-mismatch -lphobos2 -lpthread -lm -lrt -v


(no segfault)
http://pastebin.com/0yA29by1


 ----------
 
 Also did passing -fno-pie to gcc resolve your problems?


Yes.
http://pastebin.com/yLQacSuf

Those were all 32-bit.

I suppose the natural next thing to try is 64-bit:
http://pastebin.com/utYgp7YA
And yep, -fno-pie makes it run.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5278






Additional info:
I can get basic stack traces now.  Yay!  And I don't have to use paxctl -m
anymore.  Also yay!
http://pastebin.com/tt784wYr

More line numbers in the stack trace would be nice though.  

I suspect this -fno-pie thing will make shared libraries impossible on my setup
until this gets resolved though, right?

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Jan 22 2012
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5278


dawg dawgfoto.de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED




I suspect this -fno-pie thing will make shared libraries impossible on my setup
until this gets resolved though, right?


No, it doesn't.
PIE simply means randomized address space for the executable.
I do even think that PIE should work out of the box if you
compile phobos and you executables with -fPIC.

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prev sibling next sibling parent d-bugmail puremagic.com writes:
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I suspect this -fno-pie thing will make shared libraries impossible on my setup
until this gets resolved though, right?


 No, it doesn't.
 PIE simply means randomized address space for the executable.
 I do even think that PIE should work out of the box if you
 compile phobos and you executables with -fPIC.


Oh, my bad.  I confused PIE with PIC.  

So, just to be clear, -fpie is not passed by default on most systems, but it is
on mine (a feature of the hardened GCC).  DMD's binary release of phobos is
then compiled WITHOUT -fpie because that's the usual course of things, thus
causing it to complain when I link it with something that compiles WITH -fpie.  

Is there any chance that -fno-pie could make it into the list of things DMD
passes to GCC by default?  

Assuming I understand this all correctly, then other systems won't care if
-fno-pie gets passed because they don't use PIE anyways.  On my system it will
convert a dead-on-arrival binary release into something that works.  

If someone still wanted to build with PIE then the ideal, I suppose, would be
to have portage (the package manager) build everything from source, adding
-fpie and -fPIC as necessary and adjusting the dmd.conf file to reflect it.

Also, is it even possible to get -fno-pie in there through dmd.conf?

When I add -L-fno-pie in dmd.conf it adds "-Xlinker -fno-pie" instead of just
"-fno-pie" to the GCC args and it seems to end up going to the wrong place. 
Then I get linker errors and stuff won't build: http://pastebin.com/wEcuyUqp

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Jan 25 2012
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5278


Chad Joan <chadjoan gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |



I'm reopening this because DMD won't work on my system unless -fno-pie is
passed to GCC by DMD itself.  

I can't even fix this without recompiling DMD because if I add "-L-fno-pie" to
dmd.conf then will put "-Xlinker" before that and GCC itself never sees the
"-fno-pie".  (See my previous comment for more detail.)

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Feb 04 2012
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=5278






 Yeah, it's a limitation that dmd doesn't let you pass flags to gcc. It's a
 different bug though.
 
 Have you actually tried to build PIE using dmd's -fPIC flag.
 You'd need to rebuild druntime and phobos with the fPIC too.
 I think PIE will work without further changes.


It seemed like it was working before, but I did it again with more rigor to try
and confirm that all of the flags are what I think they are.  It didn't work
too well.

Here's what happened:
druntime compile: http://pastebin.com/e5HjcVRb
phobos compile: http://pastebin.com/4uATCBt1
executable compile: 

chad Hugin /mnt/bulk/dprojects/helloD2 $ dmd -fPIC -c main.d
chad Hugin /mnt/bulk/dprojects/helloD2 $ gcc main.o -o main -m32 -Xlinker
-L/usr/local/share/dcompilers/dmd/linux/bin/../lib -lphobos2 -lpthread -lm -lrt
-fPIC -pie
/usr/lib/gcc/x86_64-pc-linux-gnu/4.5.3/../../../../x86_64-pc-linux-gnu/bin/ld:
warning: creating a DT_TEXTREL in object.
chad Hugin /mnt/bulk/dprojects/helloD2 $ main
main: error while loading shared libraries: cannot make segment writable for
relocation: Permission denied
chad Hugin /mnt/bulk/dprojects/helloD2 $ sudo paxctl -m main
chad Hugin /mnt/bulk/dprojects/helloD2 $ main
Killed
chad Hugin /mnt/bulk/dprojects/helloD2 $

If I did something wrong, please let me know a better way.



It's actually really easy to write a patch for that.  In fact, I did it so that
I could continue working on my system.  Otherwise there is no way for me to
have DMD work on my system without hardcoding "-fno-pie" into dmd/src/link.c
and compiling from git.

Now, this is probably the wrong place for it, and I could stand to improve it
slightly and make sure it works off of the latest git sources (I was working
offline with this), but here is the patch for adding a -cflags parameter in
DMD, just in case anyone wants it:
http://pastebin.com/U6cTmryQ

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Feb 05 2012
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Chad Joan <chadjoan gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |7678
           Severity|blocker                     |major


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Mar 09 2012
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla digitalmars.com



12:44:00 PDT ---
Does this pull resolve the issue for you?

https://github.com/D-Programming-Language/dmd/pull/794

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Jun 28 2012
prev sibling parent d-bugmail puremagic.com writes:
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 Does this pull resolve the issue for you?
 
 https://github.com/D-Programming-Language/dmd/pull/794


Hey, I didn't even realize this response was here.

Yes it does.  Or at least it gives me a reasonable workaround until the codegen
issues are fixed.

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