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add -latomic configure check...

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...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>
This commit is contained in:
Rene Engelhard 2019-08-30 21:00:55 +02:00 committed by Stephan Bergmann
parent ae5fc99491
commit 098bf3b243
3 changed files with 50 additions and 0 deletions
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1
config_host.mk.in
View file

@ -30,6 +30,7 @@ export AR=@AR@
export ASSERT_ALWAYS_ABORT=@ASSERT_ALWAYS_ABORT@
export ATL_INCLUDE=@ATL_INCLUDE@
export ATL_LIB=@ATL_LIB@
export ATOMIC_LIB=@ATOMIC_LIB@
export AVAHI_CFLAGS=$(gb_SPACE)@AVAHI_CFLAGS@
export AVAHI_LIBS=$(gb_SPACE)@AVAHI_LIBS@
export LIBATOMIC_OPS_CFLAGS=$(gb_SPACE)@LIBATOMIC_OPS_CFLAGS@

8
configure.ac
View file

@ -6537,6 +6537,14 @@ else
fi
AC_SUBST(CXXFLAGS_CXX11)
if test "$GCC" = "yes"; then
save_CXXFLAGS=$CXXFLAGS
CXXFLAGS="$CXXFLAGS $CXXFLAGS_CXX11"
CHECK_L_ATOMIC
CXXFLAGS=$save_CXXFLAGS
AC_SUBST(ATOMIC_LIB)
fi
dnl Test for temporarily incompatible libstdc++ 4.7.{0,1}, where
dnl <https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=179528> introduced
dnl an additional member _M_size into C++11 std::list towards 4.7.0 and

41
m4/l_atomic.m4 Normal file
View file

@ -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
])