Sure, but this bug is unique to cygwin. Why would that be there bug?
On Sun, Apr 12, 2020 at 2:57 AM JonY via Cygwin <cygwin@cygwin.com> wrote: > 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 > slash > > used. > > > > Here's a sample run where profile guided optimization is getting enabled > > for a simple little C++ program: > > > > jselbie@IRONMAIDEN ~/bench > > $ g++ bench.cpp -o bench -fprofile-generate > > -fprofile-dir=/home/jselbie/bench/profile -O3 > > > > jselbie@IRONMAIDEN ~/bench > > $ ./bench.exe > > > > profiling:/home/jselbie/bench/profile/#home#jselbie#bench\bench.gcda:Skip > > > > 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). > > > > Doing a strings search on the binary reveals the same thing: > > > > jselbie@IRONMAIDEN ~/bench > > $ strings bench.exe | grep jselbie > > /home/jselbie/bench/profile/#home#jselbie#bench\bench.gcda > > > > 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 > > > > jselbie@IRONMAIDEN:~/bench$ g++ bench.cpp -o bench > -fprofile-generate > > -fprofile-dir=/home/jselbie/bench/profile -O3 > > > > jselbie@IRONMAIDEN:~/bench$ ./bench > > > > jselbie@IRONMAIDEN:~/bench$ ls profile/ > > bench.gcda > > > > jselbie@IRONMAIDEN:~/bench$ strings bench | grep jselbie > > /home/jselbie/bench/profile/bench.gcda > > > > > > The workaround is to just skip the -fprofile-dir flag altogether. > > > > Seems like there is a bug in Cygwin's build of gcc/g++ that puts the > wrong > > path separator into the executable > > > > Can this be fixed? Or a place where I can file a bug? > > > > Try filing the issue on https://gcc.gnu.org/bugzilla/, include a minimal > test case that shows the problem, thanks. > > > -- > Problem reports: https://cygwin.com/problems.html > FAQ: https://cygwin.com/faq/ > Documentation: https://cygwin.com/docs.html > Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple > -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
