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Subject:	Re: g++ with -fprofile-dir flag has a bug (backslash instead of
	forward-slash issue)
To:	cygwin AT cygwin DOT com
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From: JonY <10walls AT gmail DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <53361671-369b-0fac-039c-65150ea859ac AT gmail DOT com>
Subject: Re: g++ with -fprofile-dir flag has a bug (backslash instead of
 forward-slash issue)
References: <CAJn6YFC-brTm=nkC9_MdgZp3rj+NeMSctUYxk-8wsUThxQmRfQ AT mail DOT gmail DOT com>
In-Reply-To: <CAJn6YFC-brTm=nkC9_MdgZp3rj+NeMSctUYxk-8wsUThxQmRfQ AT mail DOT gmail DOT com>

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On 4/12/20 7:27 AM, John Selbie via Cygwin wrote:
> TLDR: With gcc/g++ 9.2.0 and 9.30 on Cygwin, when you use
> -fprofile-generate and -fprofile-dir together, the target path for the
> .gcda file is corrupted with a backslash instead of having a forward sl=
ash
> used.
>=20
> Here's a sample run where profile guided optimization is getting enable=
d
> for a simple little C++ program:
>=20
>     jselbie AT IRONMAIDEN ~/bench
>     $ g++ bench.cpp -o bench -fprofile-generate
> -fprofile-dir=3D/home/jselbie/bench/profile -O3
>=20
>     jselbie AT IRONMAIDEN ~/bench
>     $ ./bench.exe
>=20
> profiling:/home/jselbie/bench/profile/#home#jselbie#bench\bench.gcda:Sk=
ip
>=20
> That "profiling...Skip" line is an error indicating that the profiling
> library can't save the gcda file. If you look closely,there's backslash=

> between the encoded path and the filename (bench.gcda).
>=20
> Doing a strings search on the binary reveals the same thing:
>=20
>     jselbie AT IRONMAIDEN ~/bench
>     $ strings bench.exe | grep jselbie
>     /home/jselbie/bench/profile/#home#jselbie#bench\bench.gcda
>=20
> If I switch back to Linux and do the same steps, it not only works, but=
 you
> can see there is no backslash embedded into the binary either
>=20
>     jselbie AT IRONMAIDEN:~/bench$ g++ bench.cpp -o bench -fprofile-genera=
te
> -fprofile-dir=3D/home/jselbie/bench/profile -O3
>=20
>     jselbie AT IRONMAIDEN:~/bench$ ./bench
>=20
>     jselbie AT IRONMAIDEN:~/bench$ ls profile/
>     bench.gcda
>=20
>     jselbie AT IRONMAIDEN:~/bench$ strings bench | grep jselbie
>     /home/jselbie/bench/profile/bench.gcda
>=20
>=20
> The workaround is to just skip the -fprofile-dir flag altogether.
>=20
> Seems like there is a bug in Cygwin's build of gcc/g++ that puts the wr=
ong
> path separator into the executable
>=20
> Can this be fixed?  Or a place where I can file a bug?
>=20

Try filing the issue on https://gcc.gnu.org/bugzilla/, include a minimal
test case that shows the problem, thanks.



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