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Code Issues Releases Wiki Activity

Use -latomic if needed with gcc

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This commit is contained in:
Jay Berkenbilt 2020-04-10 13:30:00 -04:00
parent 578c5ac66c
commit 66198f447f
3 changed files with 70 additions and 1 deletions
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2
autofiles.sums
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@ -1,4 +1,4 @@
e764290be37a921ecba94755b6da22dd9e9b98644b8fdfdd0fa7f1331ce56a05 configure.ac
c9b8555013e70c93572e0be5f5c7c03c6b7e0680de4870010945357a02909eaa configure.ac
d3f9ee6f6f0846888d9a10fd3dad2e4b1258be84205426cf04d7cef02d61dad7 aclocal.m4
b0ce6d1dba8effa47d25154b2bb56eddafc997254a0f3f903cf9b6abffc03616 libqpdf/qpdf/qpdf-config.h.in
5297971a0ef90bcd5563eb3f7127a032bb76d3ae2af7258bf13479caf8983a60 m4/ax_cxx_compile_stdcxx.m4

43
configure vendored
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@ -16975,6 +16975,49 @@ ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $
ac_compiler_gnu=$ac_cv_c_compiler_gnu
ac_ext=cpp
ac_cpp='$CXXCPP $CPPFLAGS'
ac_compile='$CXX -c $CXXFLAGS $CPPFLAGS conftest.$ac_ext >&5'
ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to use -latomic" >&5
$as_echo_n "checking whether to use -latomic... " >&6; }
oLDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--as-needed -latomic"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <atomic>
int main()
{
static std::atomic<int> a{0};
a = a.fetch_add(1);
return 0;
}
_ACEOF
if ac_fn_cxx_try_link "$LINENO"; then :
qpdf_USE_ATOMIC=1
else
qpdf_USE_ATOMIC=0
fi
rm -f core conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
if test "$qpdf_USE_ATOMIC" = "1"; then
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
$as_echo "yes" >&6; }
else
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
$as_echo "no" >&6; }
LDFLAGS="$oLDFLAGS"
fi
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'
ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
ac_compiler_gnu=$ac_cv_c_compiler_gnu
if test "x$qpdf_OS_SECURE_RANDOM" = "x1"; then
OLIBS=$LIBS
LIBS="$LIBS Advapi32.lib"

26
configure.ac
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@ -240,6 +240,32 @@ for i in 0 1; do
done
AC_LANG_POP
AC_LANG_PUSH([C++])
AC_MSG_CHECKING(whether to use -latomic)
dnl On some platforms with some versions of gcc, you have to link with
dnl -latomic in order for std::atomic to work. Passing --as-needed
dnl prevents unnecessary linking with -latomic.
oLDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--as-needed -latomic"
AC_LINK_IFELSE([AC_LANG_SOURCE(
[[#include <atomic>
int main()
{
static std::atomic<int> a{0};
a = a.fetch_add(1);
return 0;
}
]])],
[qpdf_USE_ATOMIC=1],
[qpdf_USE_ATOMIC=0])
if test "$qpdf_USE_ATOMIC" = "1"; then
AC_MSG_RESULT(yes)
else
AC_MSG_RESULT(no)
LDFLAGS="$oLDFLAGS"
fi
AC_LANG_POP
if test "x$qpdf_OS_SECURE_RANDOM" = "x1"; then
OLIBS=$LIBS
LIBS="$LIBS Advapi32.lib"