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Merge #8563: Add configure check for -latomic

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878faac Add configure check for -latomic (Anthony Towns)
This commit is contained in:
Wladimir J. van der Laan 2016-09-09 08:57:08 +02:00 committed by Alexander Block
parent c2a601f507
commit b90d7611ab
2 changed files with 42 additions and 0 deletions
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40
build-aux/m4/l_atomic.m4 Normal file
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@ -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
])

2
configure.ac
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@ -56,6 +56,8 @@ case $host in
esac esac
dnl Require C++11 compiler (no GNU extensions) dnl Require C++11 compiler (no GNU extensions)
AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory], [nodefault]) AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory], [nodefault])
dnl Check if -latomic is required for <std::atomic>
CHECK_ATOMIC
dnl Unless the user specified OBJCXX, force it to be the same as CXX. This ensures dnl Unless the user specified OBJCXX, force it to be the same as CXX. This ensures
dnl that we get the same -std flags for both. dnl that we get the same -std flags for both.