[Bug fortran/68744] FAIL: gfortran.dg/backtrace_1.f90 -O0 execution test

[dave.anglin at bell dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68744

--- Comment #2 from dave.anglin at bell dot net ---
> WORKSFORME (x86_64-apple-darwin14) and for others (see x86_64-apple-darwin14).
> Is this a regression? If yes, what was your last working revision and did
> anything change in your system: new lib, ... ?


It is likely a regression as there are no gfortran test failures on this target
with 5.2.1:
https://gcc.gnu.org/ml/gcc-testresults/2015-12/msg00496.html

What has changed is the use of __sync functions in libgfortran:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68115

There is a patch which fixes the build of libbacktrace.  However, libbacktrace
thread support
is now disabled because of the lack of __sync support.  Patch is here:
https://gcc.gnu.org/ml/gcc-patches/2015-12/msg00658.html

Effectively, this makes libbacktrace unusable...

--
John David Anglin       dave.anglin@bell.net