diff options
| author | Rene Engelhard <rene@debian.org> | 2019-08-30 21:00:55 +0200 |
|---|---|---|
| committer | Stephan Bergmann <sbergman@redhat.com> | 2019-09-02 19:11:38 +0200 |
| commit | 098bf3b243bdbb3257fda97a54caa6c403f63df6 (patch) | |
| tree | 9321a240ffac932b7dcde6732549a80e98dd4d3d /m4 | |
| parent | ae5fc99491cf61b02b8dc1c666c88435beadf3e5 (diff) | |
add -latomic configure check...
...in preparation for <https://gerrit.libreoffice.org/#/c/78380/> "Add -latomic to the end of Linux C++ linker command lines"
(copied from https://github.com/zelcash/zelcash/blob/master/build-aux/m4/l_atomic.m4)
Change-Id: I8879a72d730cc08a72c2d8b132ff9f5d2efe7b9f
Reviewed-on: https://gerrit.libreoffice.org/78336
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/l_atomic.m4 | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/m4/l_atomic.m4 b/m4/l_atomic.m4 new file mode 100644 index 000000000000..6e011ebabe3d --- /dev/null +++ b/m4/l_atomic.m4 @@ -0,0 +1,41 @@ +# Some versions of gcc/libstdc++ require linking with -latomic if +# using the C++ atomic library. +# +# Sourced from http://bugs.debian.org/797228 + +m4_define([_CHECK_L_ATOMIC_testbody], [[ + #include <atomic> + #include <cstdint> + + int main() { + std::atomic<int64_t> a{}; + + int64_t v = 5; + int64_t r = a.fetch_add(v); + return static_cast<int>(r); + } +]]) + +AC_DEFUN([CHECK_L_ATOMIC], [ + + AC_LANG_PUSH(C++) + + AC_MSG_CHECKING([whether std::atomic can be used without link library]) + + AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_L_ATOMIC_testbody])],[ + AC_MSG_RESULT([yes]) + ],[ + AC_MSG_RESULT([no]) + LIBS="$LIBS -latomic" + AC_MSG_CHECKING([whether std::atomic needs -latomic]) + AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_L_ATOMIC_testbody])],[ + AC_MSG_RESULT([yes]) + ATOMIC_LIB=-latomic + ],[ + AC_MSG_RESULT([no]) + AC_MSG_FAILURE([cannot figure our how to use std::atomic]) + ]) + ]) + + AC_LANG_POP +]) |