digitalmars.D.learn - Undefined reference error when array size is given
- tcak (43/43) Jan 19 2015 Code is as follows:
- ketmar via Digitalmars-d-learn (8/9) Jan 19 2015 "core.sys.posix.poll.d" module is not compiled into druntime. as it is
- Steven Schveighoffer (7/13) Jan 19 2015 I think this not the root cause. Of course poll.d should be in druntime,...
- ketmar via Digitalmars-d-learn (6/22) Jan 19 2015 On Mon, 19 Jan 2015 16:27:51 -0500
- Steven Schveighoffer (9/30) Jan 19 2015 I figured it out, poll.d is missing from here:
- ketmar via Digitalmars-d-learn (9/20) Jan 19 2015 On Mon, 19 Jan 2015 16:49:34 -0500
- Steven Schveighoffer (7/26) Jan 19 2015 I want to make a PR, but I'm considering whether I should PR ALL the
- ketmar via Digitalmars-d-learn (7/10) Jan 19 2015 On Mon, 19 Jan 2015 17:05:22 -0500
- Steven Schveighoffer (6/13) Jan 20 2015 And the answer:
- ketmar via Digitalmars-d-learn (9/28) Jan 20 2015 On Tue, 20 Jan 2015 07:00:31 -0500
- Steven Schveighoffer (4/14) Jan 20 2015 A good point. It certainly would make this less of an issue.
- Steven Schveighoffer (4/17) Jan 19 2015 I take it back, this happens on my system OSX where it shouldn't.
- ketmar via Digitalmars-d-learn (10/10) Jan 19 2015 On Mon, 19 Jan 2015 21:00:55 +0000
Code is as follows:
main.d
=========================
import core.sys.posix.poll;
void main(){
core.sys.posix.poll.pollfd[2] pollList;
}
=========================
Error:
main.d:(.text._Dmain+0x15): undefined reference to
`_D4core3sys5posix4poll6pollfd6__initZ'
Remove "2" and it works.
main.d
==========================
import core.sys.posix.poll;
void main(){
core.sys.posix.poll.pollfd[] pollList;
}
=========================
The error points to "__init". Struct is defined very simply.
struct pollfd
{
int fd;
short events;
short revents;
}
I defined same struct in main file, and defined a similar array.
There is no problem with that.
main.d
=========================
import core.sys.posix.poll;
struct pollfd2
{
int fd;
short events;
short revents;
}
void main(){
core.sys.posix.poll.pollfd[] pollList;
pollfd2[2] blah;
}
=========================
What is the reason of this error exactly?
Jan 19 2015
On Mon, 19 Jan 2015 21:00:55 +0000 tcak via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:What is the reason of this error exactly?"core.sys.posix.poll.d" module is not compiled into druntime. as it is in "include" path, compiler sees it and you can use `pollfd` struct. but as it's not in link library, there is no `.init` section for it. as a workaroun you can either manually add that module to dmd command line, or use `pollfd[2] pollList =3D void;` (and don't forget to manually initialise ALL pollfd fields for all array elements then).
Jan 19 2015
On 1/19/15 4:16 PM, ketmar via Digitalmars-d-learn wrote:On Mon, 19 Jan 2015 21:00:55 +0000 tcak via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:I think this not the root cause. Of course poll.d should be in druntime, if applicable. What I likely think is that he is compiling on a platform where poll.d is not supported. Can you give more info on your build environment? -SteveWhat is the reason of this error exactly?"core.sys.posix.poll.d" module is not compiled into druntime. as it is in "include" path, compiler sees it and you can use `pollfd` struct. but as it's not in link library, there is no `.init` section for it.
Jan 19 2015
On Mon, 19 Jan 2015 16:27:51 -0500 Steven Schveighoffer via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:On 1/19/15 4:16 PM, ketmar via Digitalmars-d-learn wrote:=20On Mon, 19 Jan 2015 21:00:55 +0000 tcak via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:=20 I think this not the root cause. Of course poll.d should be in druntime,=What is the reason of this error exactly?"core.sys.posix.poll.d" module is not compiled into druntime. as it is in "include" path, compiler sees it and you can use `pollfd` struct. but as it's not in link library, there is no `.init` section for it.if applicable. =20 What I likely think is that he is compiling on a platform where poll.d=20 is not supported. =20 Can you give more info on your build environment?i tried that on my 32-bit GNU/Linux box, and the result is the same. but `poll (2)` is certainly supported here. dmd git head, as usual. ;-)
Jan 19 2015
On 1/19/15 4:33 PM, ketmar via Digitalmars-d-learn wrote:On Mon, 19 Jan 2015 16:27:51 -0500 Steven Schveighoffer via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:I figured it out, poll.d is missing from here: https://github.com/D-Programming-Language/druntime/blob/master/mak/SRCS So it's for some reason not purposely included. I think there's an expectation (I'm probably guilty of this too) that if you include a file somewhere in druntime's core subdirectory, it gets compiled in. There are actually quite a few files not included... not sure why. -SteveOn 1/19/15 4:16 PM, ketmar via Digitalmars-d-learn wrote:i tried that on my 32-bit GNU/Linux box, and the result is the same. but `poll (2)` is certainly supported here. dmd git head, as usual. ;-)On Mon, 19 Jan 2015 21:00:55 +0000 tcak via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:I think this not the root cause. Of course poll.d should be in druntime, if applicable. What I likely think is that he is compiling on a platform where poll.d is not supported. Can you give more info on your build environment?What is the reason of this error exactly?"core.sys.posix.poll.d" module is not compiled into druntime. as it is in "include" path, compiler sees it and you can use `pollfd` struct. but as it's not in link library, there is no `.init` section for it.
Jan 19 2015
On Mon, 19 Jan 2015 16:49:34 -0500 Steven Schveighoffer via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:I figured it out, poll.d is missing from here: =20 https://github.com/D-Programming-Language/druntime/blob/master/mak/SRCS =20 So it's for some reason not purposely included. =20 I think there's an expectation (I'm probably guilty of this too) that if==20you include a file somewhere in druntime's core subdirectory, it gets=20 compiled in. =20 There are actually quite a few files not included... not sure why.i believe that they are just accidentally left out. besides, if some file defines only extern functions and constants, it can be safely ommited. yet including it will not hurt too (and will add some sanity checks on build time -- like ensuring that it is syntactically correct). so i believe that this is an accidental omission that worth a PR.
Jan 19 2015
On 1/19/15 4:54 PM, ketmar via Digitalmars-d-learn wrote:On Mon, 19 Jan 2015 16:49:34 -0500 Steven Schveighoffer via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:I want to make a PR, but I'm considering whether I should PR ALL the missing modules, or just this one :) I will consult the devs mailing list... BTW, I've seen linker errors happen when you don't include a module, even if there's seemingly nothing to deal with in there. To the point where I just include all modules even if I think I can omit them. -SteveI figured it out, poll.d is missing from here: https://github.com/D-Programming-Language/druntime/blob/master/mak/SRCS So it's for some reason not purposely included. I think there's an expectation (I'm probably guilty of this too) that if you include a file somewhere in druntime's core subdirectory, it gets compiled in. There are actually quite a few files not included... not sure why.i believe that they are just accidentally left out. besides, if some file defines only extern functions and constants, it can be safely ommited. yet including it will not hurt too (and will add some sanity checks on build time -- like ensuring that it is syntactically correct). so i believe that this is an accidental omission that worth a PR.
Jan 19 2015
ketmar via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> On Mon, 19 Jan 2015 17:05:22 -0500 Steven Schveighoffer via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:BTW, I've seen linker errors happen when you don't include a module,=20 even if there's seemingly nothing to deal with in there. To the point=20 where I just include all modules even if I think I can omit them.this is good for all-at-once compilation, but separate compilation is a different story... it's often hard/burdensome to convince a build tool to include given module in a command line. and most non D-specific build tools are written with separate compilation model in mind.
Jan 19 2015
On 1/19/15 4:49 PM, Steven Schveighoffer wrote:I figured it out, poll.d is missing from here: https://github.com/D-Programming-Language/druntime/blob/master/mak/SRCS So it's for some reason not purposely included. I think there's an expectation (I'm probably guilty of this too) that if you include a file somewhere in druntime's core subdirectory, it gets compiled in. There are actually quite a few files not included... not sure why.And the answer: http://forum.dlang.org/thread/1FE961B1-8454-4298-AD8F-16069971EFA1 yahoo.com#post-54BE1AF6.7040805:40dawg.eu https://issues.dlang.org/show_bug.cgi?id=14014 So it looks like it's a DMD bug and we should not include that module. -Steve
Jan 20 2015
On Tue, 20 Jan 2015 07:00:31 -0500 Steven Schveighoffer via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:On 1/19/15 4:49 PM, Steven Schveighoffer wrote: =20com#post-54BE1AF6.7040805:40dawg.eu oh, i see, i wasn't thought about moduleinfo and other data.I figured it out, poll.d is missing from here: https://github.com/D-Programming-Language/druntime/blob/master/mak/SRCS So it's for some reason not purposely included. I think there's an expectation (I'm probably guilty of this too) that if you include a file somewhere in druntime's core subdirectory, it gets compiled in. There are actually quite a few files not included... not sure why.=20 And the answer: http://forum.dlang.org/thread/1FE961B1-8454-4298-AD8F-16069971EFA1 yahoo.=https://issues.dlang.org/show_bug.cgi?id=3D14014 =20 So it looks like it's a DMD bug and we should not include that module.sorry, i can't see how this bug is related to non-inclusion. actually, it's about the exact opposite! p.s. it it even necessary to generate moduleinfo for modules without initializers and without complex data structures with references?
Jan 20 2015
On 1/20/15 9:07 AM, ketmar via Digitalmars-d-learn wrote:On Tue, 20 Jan 2015 07:00:31 -0500 Steven Schveighoffer via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:The point is, it generates moduleinfo needlessly.https://issues.dlang.org/show_bug.cgi?id=14014 So it looks like it's a DMD bug and we should not include that module.sorry, i can't see how this bug is related to non-inclusion. actually, it's about the exact opposite!p.s. it it even necessary to generate moduleinfo for modules without initializers and without complex data structures with references?A good point. It certainly would make this less of an issue. -Steve
Jan 20 2015
On 1/19/15 4:27 PM, Steven Schveighoffer wrote:On 1/19/15 4:16 PM, ketmar via Digitalmars-d-learn wrote:I take it back, this happens on my system OSX where it shouldn't. I will investigate, seems like a build bug. -SteveOn Mon, 19 Jan 2015 21:00:55 +0000 tcak via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote:I think this not the root cause. Of course poll.d should be in druntime, if applicable. What I likely think is that he is compiling on a platform where poll.d is not supported. Can you give more info on your build environment?What is the reason of this error exactly?"core.sys.posix.poll.d" module is not compiled into druntime. as it is in "include" path, compiler sees it and you can use `pollfd` struct. but as it's not in link library, there is no `.init` section for it.
Jan 19 2015
On Mon, 19 Jan 2015 21:00:55 +0000 tcak via Digitalmars-d-learn <digitalmars-d-learn puremagic.com> wrote: p.s. i love new binutils! % dmd z00.d z00.o: In function `D main': z00.d:(.text._Dmain+0xa): undefined reference to `core.sys.posix.poll.pollf= d.init$' z00.d:(.text._Dmain+0x10): undefined reference to `core.sys.posix.poll.poll= fd.init$' collect2: error: ld returned 1 exit status
Jan 19 2015