diff options
| author | Anthony Towns <aj@erisian.com.au> | 2016-08-23 16:55:15 +1000 |
|---|---|---|
| committer | Luke Dashjr <luke-jr+git@utopios.org> | 2016-09-21 02:43:47 +0000 |
| commit | 147003c73edb5a949ca403ecf8883c1b8bfaa6c1 (patch) | |
| tree | aed40c392423dbc094f3edbf07d6e0d4ebc148a1 /build-aux | |
| parent | 091cdebfb823734559f9694c4c45eba1598b05ff (diff) | |
Add configure check for -latomic
Github-Pull: #8563
Rebased-From: 878faacd7b3daac437cc689b13422f6432fb5cd0
Diffstat (limited to 'build-aux')
| -rw-r--r-- | build-aux/m4/l_atomic.m4 | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/build-aux/m4/l_atomic.m4 b/build-aux/m4/l_atomic.m4 new file mode 100644 index 0000000000..906724b640 --- /dev/null +++ b/build-aux/m4/l_atomic.m4 @@ -0,0 +1,40 @@ +# 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_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_ATOMIC], [ + + AC_LANG_PUSH(C++) + + AC_MSG_CHECKING([whether std::atomic can be used without link library]) + + AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_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_ATOMIC_testbody])],[ + AC_MSG_RESULT([yes]) + ],[ + AC_MSG_RESULT([no]) + AC_MSG_FAILURE([cannot figure our how to use std::atomic]) + ]) + ]) + + AC_LANG_POP +]) |