save_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -fmerge-constants"
AC_COMPILE_IFELSE([const char *s = "foo";],
- [have_merge_constants=yes],
- [have_merge_constants=no])
+ [gold_cv_merge_constants=yes],
+ [gold_cv_merge_constants=no])
CFLAGS="$save_CFLAGS"])
AC_SUBST([MERGE_CONSTANTS_FLAG])
AS_IF([test "$gold_cv_merge_constants" = yes],
AM_CONDITIONAL(OMP_SUPPORT, test "$gold_cv_c_threadprivate" = "yes")
dnl Test for the -ftls-dialect=gnu2 option.
+dnl Use -Werror in case of compilers that make unknown -m options warnings.
+dnl They would pass the test here, but fail in actual use when $WARN_CFLAGS
+dnl gets set later by default Autoconf magic to include -Werror. (We are
+dnl assuming here that there is no compiler that groks -mtls-dialect=gnu2
+dnl but does not grok -Werror.)
save_CFLAGS="$CFLAGS"
-CFLAGS="$CFLAGS -fpic -mtls-dialect=gnu2"
+CFLAGS="$CFLAGS -Werror -fpic -mtls-dialect=gnu2"
AC_COMPILE_IFELSE([
__thread int i;
void foo (void)
AC_CHECK_HEADERS(byteswap.h)
dnl When plugins enabled dynamic loader interface is required. Check headers
-dnl which may provide this interface. In case of dlfcn.h add libdl to link.
+dnl which may provide this interface. Add the necessary library to link.
AC_CHECK_HEADERS(windows.h)
-AC_CHECK_HEADERS(dlfcn.h, [DLOPEN_LIBS="-ldl"], [DLOPEN_LIBS=""])
+AC_CHECK_HEADERS(dlfcn.h)
+AC_SEARCH_LIBS(dlopen, [dl dld])
+case "$ac_cv_search_dlopen" in
+ no*) DLOPEN_LIBS="";;
+ *) DLOPEN_LIBS="$ac_cv_search_dlopen";;
+esac
AC_SUBST(DLOPEN_LIBS)
AC_CHECK_FUNCS(mallinfo posix_fallocate fallocate readv sysconf times)
fi
dnl Check if gcc supports the -gpubnames option.
+dnl Use -Werror in case of compilers that make unknown -g options warnings.
+dnl They would pass the test here, but fail in actual use when $WARN_CFLAGS
+dnl gets set later by default Autoconf magic to include -Werror. (We are
+dnl assuming here that there is no compiler that groks -gpubnames
+dnl but does not grok -Werror.)
save_CXXFLAGS="$CXXFLAGS"
-CXXFLAGS="$CXXFLAGS -gpubnames"
+CXXFLAGS="$CXXFLAGS -Werror -gpubnames"
AC_COMPILE_IFELSE([int i;], [have_pubnames=yes], [have_pubnames=no])
CXXFLAGS="$save_CXXFLAGS"
AM_CONDITIONAL(HAVE_PUBNAMES, test "$have_pubnames" = "yes")