* [Bug lto/97524] Compiling with -flto=auto fails in make is not installed
2020-10-21 19:19 [Bug lto/97524] New: Compiling with -flto=auto fails in make is not installed tstellar at redhat dot com
@ 2020-10-22 6:32 ` marxin at gcc dot gnu.org
2020-10-22 7:15 ` jakub at gcc dot gnu.org
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From: marxin at gcc dot gnu.org @ 2020-10-22 6:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97524
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-10-22
Ever confirmed|0 |1
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
Status|UNCONFIRMED |ASSIGNED
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed. When make is not installed, no fallback is possible as LTO uses make
to do the parallel execution.
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2020-10-21 19:19 [Bug lto/97524] New: Compiling with -flto=auto fails in make is not installed tstellar at redhat dot com
2020-10-22 6:32 ` [Bug lto/97524] " marxin at gcc dot gnu.org
@ 2020-10-22 7:15 ` jakub at gcc dot gnu.org
2020-10-22 7:22 ` rguenth at gcc dot gnu.org
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From: jakub at gcc dot gnu.org @ 2020-10-22 7:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97524
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Well, can't it fall back to serial compilation?
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2020-10-21 19:19 [Bug lto/97524] New: Compiling with -flto=auto fails in make is not installed tstellar at redhat dot com
2020-10-22 6:32 ` [Bug lto/97524] " marxin at gcc dot gnu.org
2020-10-22 7:15 ` jakub at gcc dot gnu.org
@ 2020-10-22 7:22 ` rguenth at gcc dot gnu.org
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From: rguenth at gcc dot gnu.org @ 2020-10-22 7:22 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> Well, can't it fall back to serial compilation?
It could, maybe with some diagnostic. It could also use fork-based
parallelism.
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From: marxin at gcc dot gnu.org @ 2020-10-22 7:25 UTC (permalink / raw)
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
> It could, maybe with some diagnostic. It could also use fork-based
> parallelism.
It seems to me extra work.
Expecting make for parallel execution seems to be a reasonable request.
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From: marxin at gcc dot gnu.org @ 2020-10-22 12:09 UTC (permalink / raw)
To: gcc-bugs
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |11.0
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Btw. the following also fails probably since the beginning:
$ echo "void main() { }" | MAKE=mymake gcc -x c -flto=16 -
lto-wrapper: fatal error: execvp: No such file or directory
compilation terminated.
/usr/lib64/gcc/x86_64-suse-linux/10/../../../../x86_64-suse-linux/bin/ld:
error: lto-wrapper failed
collect2: error: ld returned 1 exit status
I've got a patch for both cases.
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From: tstellar at redhat dot com @ 2020-10-22 14:05 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #6 from Tom Stellard <tstellar at redhat dot com> ---
If I have make installed on my system, but am using something else (e.g. ninja)
to build my project, will I still get parallel execution?
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From: marxin at gcc dot gnu.org @ 2020-10-23 7:03 UTC (permalink / raw)
To: gcc-bugs
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Tom Stellard from comment #6)
> If I have make installed on my system, but am using something else (e.g.
> ninja) to build my project, will I still get parallel execution?
No, we construct an artificial Make file that we pass to make.
Anyway, a system w/o make is quite awkward, it's such an essential tool :)
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2020-10-21 19:19 [Bug lto/97524] New: Compiling with -flto=auto fails in make is not installed tstellar at redhat dot com
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From: cvs-commit at gcc dot gnu.org @ 2020-10-23 7:48 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97524
--- Comment #8 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Martin Liska <marxin@gcc.gnu.org>:
https://gcc.gnu.org/g:6fade5a6044b7102758f4ca66c8715ebc12a6306
commit r11-4279-g6fade5a6044b7102758f4ca66c8715ebc12a6306
Author: Martin Liska <mliska@suse.cz>
Date: Thu Oct 22 14:07:29 2020 +0200
LTO: check that make command works
gcc/ChangeLog:
PR lto/97524
* lto-wrapper.c (make_exists): New function.
(run_gcc): Use it to check that make is present and working
for parallel execution.
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From: marxin at gcc dot gnu.org @ 2020-10-23 7:55 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97524
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Known to work| |11.0
Resolution|--- |FIXED
Known to fail| |10.2.0
--- Comment #9 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed, not planning to backport it.
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