Hello,
I would like to fix the -fprofile-update=atomic implementation so that
it works on all targets. Currently, it works only on targets with 64-bit
atomic operations in hardware (and some special cases). I tried to fix
it like this:
https://gcc.gnu.org/pipermail/gcc-patches/2022-December/608620.html
The problem with this patch is that it falls back to use functions
provided by libatomic. The libatomic is currently not supported on all
targets, for example:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77466
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77378
Why is there no libatomic default implementation using gthr.h?
The C++ library already depends on gthr.h and installs the headers in
"bits/gthr.h" etc. For this the libstdc++-v3 configure/Makefile
duplicates some logic from libgcc. Why is the gthr.h stuff not installed
by libgcc itself?
In libatomic, the POSIX implementation could be easily rewritten to use
the gthr interface.
Any objections to do the following?
1. Install gthr.h to "bits/gthr.h" by libgcc (including the other gthr
headers).
2. Remove the gthr configure/Makefile support from libstdc++-v3.
3. Use gthr as the default implementation of libatomic.
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