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digitalmars.D.learn - dmd -> ldmd2: /usr/bin/ld.gold: error: <source>.o: multiple definition

reply kdevel <kdevel vogtner.de> writes:
After replacing dmd with ldmd2 (LDC 1.25.1) I get tons of link 
errors all of
the form mentioned in the subject. Any idea what can be done 
about it?

(With a handcrafted single compile/link statement using ldc2 
everything compiles
but ideally I want to reuse my Makefile).
Mar 06 2021
next sibling parent reply Preetpal <preetpal.sohal gmail.com> writes:
On Saturday, 6 March 2021 at 22:14:26 UTC, kdevel wrote:

 After replacing dmd with ldmd2 (LDC 1.25.1) I get tons of link 
 errors all of
 the form mentioned in the subject. Any idea what can be done 
 about it?

 (With a handcrafted single compile/link statement using ldc2 
 everything compiles
 but ideally I want to reuse my Makefile).


Can you post more information? Like the full error that you are 
seeing, the command you are forced to use to allow everything to 
compile, the platform that you are on (Mac, BSD, Linux, etc.).
Mar 06 2021
parent reply kdevel <kdevel vogtner.de> writes:
On Sunday, 7 March 2021 at 01:29:50 UTC, Preetpal wrote:
[...]

 Can you post more information? Like the full error that you are 
 seeing,


[link cmd]
/usr/bin/ld.gold: error: pointless.o: multiple definition of 
'_D3ldc10attributes10assumeUsedySQBeQBd11_assumeUsed'
/usr/bin/ld.gold: localscop.o: previous definition here
/usr/bin/ld.gold: error: pointless.o: multiple definition of 
'_D3ldc10attributes11optStrategy11__xopEqualsFKxSQBuQBtQBkKxQmZb'
/usr/bin/ld.gold: localscop.o: previous definition here
/usr/bin/ld.gold: error: pointless.o: multiple definition of 
'_D3ldc10attributes11optStrategy9__xtoHashFNbNeKxSQBvQBuQBlZm'
/usr/bin/ld.gold: localscop.o: previous definition here
/usr/bin/ld.gold: error: pointless.o: multiple definition of 
'_D3ldc10attributes12__ModuleInfoZ'
/usr/bin/ld.gold: localscop.o: previous definition here
/usr/bin/ld.gold: error: pointless.o: multiple definition of 
'_D3ldc10attributes14dynamicCompileySQBiQBh15_dynamicCompile'
/usr/bin/ld.gold: localscop.o: previous definition here
/usr/bin/ld.gold: error: pointless.o: multiple definition of 
'_D3ldc10attributes16llvmFastMathFlag11__xopEqualsFKxSQBzQByQBpKxQmZb'
[...]


 the command you are forced to use to allow everything to 
 compile,


./dmd -i -I=tillyscop:tillyscop/msgpack-d/src -O -g 
-of=localscop.o -c tillyscop/scop.d tillyscop/scopserializer.d

and

./dmd -i -of=pointless.o -g -c pointless/package.d

"dmd" is a symlink to /opt/ldc2/bin/ldmd2


 the platform that you are on (Mac, BSD, Linux, etc.).


x86_64, Linux, OpenSUSE 42.2.

$ rpm -qi binutils
Name        : binutils
Version     : 2.29.1
Release     : 9.6.1
Architecture: x86_64

To check if the linker makes problems I have replaced ld.gold 
with the ld-new from hand-compiled binutils 2.36.1. Now the error 
messages look a bit different,
a bit more verbose:

/usr/bin/ld.gold: 
pointless.o:(.rodata._D3ldc10attributes10assumeUsedySQBeQBd11_assumeUsed+0x0):
multiple definition of $
_D3ldc10attributes10assumeUsedySQBeQBd11_assumeUsed'; 
/usr/bin/ld.gold: DWARF error: could not find variable 
specificatio
n at offset a0b
/usr/bin/ld.gold: DWARF error: could not find variable 
specification at offset 23de
localscop.o:(.rodata._D3ldc10attributes10assumeUsedySQBeQBd11_assumeUsed+0x0):
first defined here
/usr/bin/ld.gold: pointless.o: in function 
`_D3ldc10attributes11optStrategy11__xopEqualsFKxSQBuQBtQBkKxQmZb':
/opt/ldc2-1.25.1-linux-x86_64/bin/../import/ldc/attributes.d:(.text._D3ldc10attributes11optStrategy11__xopEqualsFKxSQBuQB
tQBkKxQmZb+0x0): multiple definition of 
`_D3ldc10attributes11optStrategy11__xopEqualsFKxSQBuQBtQBkKxQmZb';
localscop.o:/o
pt/ldc2-1.25.1-linux-x86_64/bin/../import/ldc/attributes.d:(.text._D3ldc10attributes11optStrategy11__xopEqualsFKxSQBuQBtQ
BkKxQmZb+0x0): first defined here
[...]
Mar 07 2021
parent reply kinke <noone nowhere.com> writes:
On Sunday, 7 March 2021 at 11:34:08 UTC, kdevel wrote:

 ./dmd -i -I=tillyscop:tillyscop/msgpack-d/src -O -g 
 -of=localscop.o -c tillyscop/scop.d tillyscop/scopserializer.d

 and

 ./dmd -i -of=pointless.o -g -c pointless/package.d

 "dmd" is a symlink to /opt/ldc2/bin/ldmd2


Ah, try using `-i=-ldc` instead of `-i` alone to manually exclude 
the ldc.* modules from being included.
Mar 07 2021
parent kdevel <kdevel vogtner.de> writes:
On Sunday, 7 March 2021 at 12:47:45 UTC, kinke wrote:
[...]

 ./dmd -i -of=pointless.o -g -c pointless/package.d

 "dmd" is a symlink to /opt/ldc2/bin/ldmd2


 Ah, try using `-i=-ldc` instead of `-i` alone to manually 
 exclude the ldc.* modules from being included.


Solved the issue. Many thanks!
Mar 07 2021
prev sibling parent reply z <z z.com> writes:
On Saturday, 6 March 2021 at 22:14:26 UTC, kdevel wrote:

 After replacing dmd with ldmd2 (LDC 1.25.1) I get tons of link 
 errors all of
 the form mentioned in the subject. Any idea what can be done 
 about it?

 (With a handcrafted single compile/link statement using ldc2 
 everything compiles
 but ideally I want to reuse my Makefile).


I think i had a similar error, can you try adding

version(LDC) pragma(LDC_no_moduleinfo)


to the affected modules? At the line just after the module 
declaration, particularly in all package.d files and the file 
that contains the main function.
However, your error seems to be with the files inside LDC... I'm 
not sure if this will solve it.
Mar 07 2021
parent kdevel <kdevel vogtner.de> writes:
On Sunday, 7 March 2021 at 11:50:45 UTC, z wrote:
[...]

 I think i had a similar error, can you try adding

version(LDC) pragma(LDC_no_moduleinfo)


 to the affected modules? At the line just after the module 
 declaration, particularly in all package.d files and the file 
 that contains the main function.


It seems to require editing each file in the codebase, package.d
does not suffice. The errors don't go away but now undefined 
references
show up:

/usr/bin/ld.gold: App.o:(.data._D3App12__ModuleInfoZ+0x128): 
undefined reference to 
`_D9tillyscop14scopserializer12__ModuleInfoZ'
Mar 07 2021