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Add configure check for -latomic

pull/1/head
Anthony Towns 6 years ago
parent
commit
878faacd7b
  1. 40
      build-aux/m4/l_atomic.m4
  2. 3
      configure.ac

40
build-aux/m4/l_atomic.m4

@ -0,0 +1,40 @@ @@ -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
])

3
configure.ac

@ -57,6 +57,9 @@ case $host in @@ -57,6 +57,9 @@ case $host in
esac
dnl Require C++11 compiler (no GNU extensions)
AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])
dnl Check if -latomic is required for <std::atomic>
CHECK_ATOMIC
dnl Libtool init checks.
LT_INIT([pic-only])

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