* [Bug target/65581] [5 Regression] testsuite lto issue: multiple definition of `main', undefined reference to `WinMain'
2015-03-26 12:27 [Bug target/65581] New: testsuite lto issue: multiple definition of `main', undefined reference to `WinMain' rainer@emrich-ebersheim.de
@ 2015-03-26 12:33 ` rainer@emrich-ebersheim.de
2015-03-26 12:43 ` rguenth at gcc dot gnu.org
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From: rainer@emrich-ebersheim.de @ 2015-03-26 12:33 UTC (permalink / raw)
To: gcc-bugs
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Rainer Emrich <rainer@emrich-ebersheim.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|testsuite lto issue: |[5 Regression] testsuite
|multiple definition of |lto issue: multiple
|`main', undefined reference |definition of `main',
|to `WinMain' |undefined reference to
| |`WinMain'
--- Comment #1 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
New issue, gcc 5 regression.
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2015-03-26 12:33 ` [Bug target/65581] [5 Regression] " rainer@emrich-ebersheim.de
@ 2015-03-26 12:43 ` rguenth at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2015-03-26 12:43 UTC (permalink / raw)
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Can you try reducing to a minimal example? it would seem that int main() {
return 0; } should already fail this way?
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2015-03-26 12:27 [Bug target/65581] New: testsuite lto issue: multiple definition of `main', undefined reference to `WinMain' rainer@emrich-ebersheim.de
2015-03-26 12:33 ` [Bug target/65581] [5 Regression] " rainer@emrich-ebersheim.de
2015-03-26 12:43 ` rguenth at gcc dot gnu.org
@ 2015-03-26 12:43 ` rguenth at gcc dot gnu.org
2015-03-26 12:59 ` rainer@emrich-ebersheim.de
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From: rguenth at gcc dot gnu.org @ 2015-03-26 12:43 UTC (permalink / raw)
To: gcc-bugs
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |5.0
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2015-03-26 12:43 ` rguenth at gcc dot gnu.org
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From: rainer@emrich-ebersheim.de @ 2015-03-26 12:59 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #3 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
(In reply to Richard Biener from comment #2)
> Can you try reducing to a minimal example? it would seem that int main() {
> return 0; } should already fail this way?
test.c:
int main()
{
return 0;
}
Installed gcc:
gcc test.c -fno-diagnostics-show-caret -fdiagnostics-color=never -O2 -flto -lm
-o test.exe
D:\msys64\tmp\ccNrn9pc.lto.o:<artificial>:(.text.startup+0x0): multiple
definition of `main'
D:/x86_64-w64-trunk/mingw/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):D:/opt/devel/gnu/src/gcc-mingw-w64/mingw-w64-runtime.git/mingw-w64-crt/crt/crt0_c.c:17:
first defined here
D:/x86_64-w64-trunk/mingw/lib/../lib/libmingw32.a(lib64_libmingw32_a-crt0_c.o):
In function `main':
D:/opt/devel/gnu/src/gcc-mingw-w64/mingw-w64-runtime.git/mingw-w64-crt/crt/crt0_c.c:18:
undefined reference to `WinMain'
collect2.exe: error: ld returned 1 exit status
Yeah, there's a real problem!
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From: ktietz at gcc dot gnu.org @ 2015-03-26 15:49 UTC (permalink / raw)
To: gcc-bugs
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Kai Tietz <ktietz at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at ucw dot cz
--- Comment #6 from Kai Tietz <ktietz at gcc dot gnu.org> ---
As far as I understand this issue does LTO now handle stuff used from object
file different to prior versions. I add Jan. He might be able to give us some
more points
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From: rainer@emrich-ebersheim.de @ 2015-04-01 14:51 UTC (permalink / raw)
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--- Comment #7 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
(In reply to Kai Tietz from comment #6)
> As far as I understand this issue does LTO now handle stuff used from object
> file different to prior versions. I add Jan. He might be able to give us
> some more points
Any news on this issue. IMHO it would be a shame to not have lto working on
mingw-w64 targets for gcc 5.0, even mingw-w64 isn't primary/secondary platform.
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2015-04-01 14:51 ` rainer@emrich-ebersheim.de
@ 2015-04-01 23:18 ` hubicka at gcc dot gnu.org
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From: hubicka at gcc dot gnu.org @ 2015-04-01 23:18 UTC (permalink / raw)
To: gcc-bugs
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Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |hubicka at gcc dot gnu.org
--- Comment #8 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Hmm, is it still a problem and if so, why it is marked as resolved/invalid?
crtbegin/crtend should be compiled without LTO even with LTO bootstrap.
Can you post the callgraph and resolution file created by compiling the
testcase with --save-temps and -fdump-ipa-cgraph?
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--- Comment #9 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
Created attachment 35210
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35210&action=edit
Test case including temporaries
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From: rainer@emrich-ebersheim.de @ 2015-04-02 9:07 UTC (permalink / raw)
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--- Comment #10 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
(In reply to Jan Hubicka from comment #8)
> Hmm, is it still a problem and if so, why it is marked as resolved/invalid?
>
> crtbegin/crtend should be compiled without LTO even with LTO bootstrap.
> Can you post the callgraph and resolution file created by compiling the
> testcase with --save-temps and -fdump-ipa-cgraph?
The attached test case is compiled with gcc version 5.0.0 20150326
(experimental) [trunk revision 221697] (GCC).
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2015-04-02 9:07 ` rainer@emrich-ebersheim.de
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From: hubicka at gcc dot gnu.org @ 2015-04-02 16:29 UTC (permalink / raw)
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--- Comment #11 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Thanks!
The resolution file is wrong:
1
test.o 1
172 795d441a PREEMPTED_REG main
the resolution of main() should be PREVAILING_DEF_IRONLY. PREEMTED_REG is
defined as follows:
PREEMPTED_REG (this definition was pre-empted by a definition in a regular
object file)
This is linker bug. It basicaly instructs GCC to drop the definition of main
because it is defined elsewhere.
However GCC is not ready for non-weak symbol to be preemted and produces the
function into final binary anyway:
.file "<artificial>"
.def __main; .scl 2; .type 32; .endef
.text
.globl main
.def main; .scl 2; .type 32; .endef
.seh_proc main
main:
subq $40, %rsp
.seh_stackalloc 40
.seh_endprologue
call __main
movl $0, %eax
addq $40, %rsp
ret
.seh_endproc
.ident "GCC: (GNU) 5.0.0 20150326 (experimental) [trunk revision
221697]"
Is something wrong with this assembly? How does the testecase comile w/o LTO?
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From: rainer@emrich-ebersheim.de @ 2015-04-02 18:42 UTC (permalink / raw)
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--- Comment #12 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
Created attachment 35218
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35218&action=edit
Test case compiled without -flto.
This without -flto.
By the way ld is:
GNU ld (GNU Binutils) 2.25.51.20150326
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From: hubicka at gcc dot gnu.org @ 2015-04-02 23:31 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #13 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Rainer,
the compiled code (test.s) is identical to what LTO path produces, so I am
convinced this is a bug at binutils side. Would you please mind filling up the
PR?
There are two issues at least - first is that the resolution of main should be
PREVAILING_DEF and second that it should not fail with undefined symbol.
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From: rainer@emrich-ebersheim.de @ 2015-04-03 9:23 UTC (permalink / raw)
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--- Comment #14 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Am 03.04.2015 01:31, schrieb hubicka at gcc dot gnu.org:
> --- Comment #13 from Jan Hubicka <hubicka at gcc dot gnu.org> --- the
> compiled code (test.s) is identical to what LTO path produces, so I am
> convinced this is a bug at binutils side. Would you please mind filling up
> the PR?
Yes, of course. I will do this later today or on the weekend. I'm trying
binutils 2.25 at the moment, to check if this version is ok.
>
> There are two issues at least - first is that the resolution of main should
> be PREVAILING_DEF and second that it should not fail with undefined
> symbol.
>
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From: rainer@emrich-ebersheim.de @ 2015-04-04 21:59 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #15 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
Bug report opened for ld.
https://sourceware.org/bugzilla/show_bug.cgi?id=18199
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--- Comment #16 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
Indeed this seems to be a linker bug in ld on binutils head.
Doesn't reproduce with binutils 2.25.
^ permalink raw reply [flat|nested] 16+ messages in thread