Commit b6fff391 authored by Ian Lynagh's avatar Ian Lynagh

Add a configure test for the visibility hidden attribute

parent 7267a786
......@@ -35,6 +35,24 @@ AC_DEFUN([FPTOOLS_SET_C_LD_FLAGS],
])
# FP_VISIBILITY_HIDDEN
# ----------------------------------
# Is the visibility hidden attribute supported?
AC_DEFUN([FP_VISIBILITY_HIDDEN],
[
AC_MSG_CHECKING([whether __attribute__((visibility("hidden"))) is supported])
echo '__attribute__((visibility("hidden"))) void foo(void) {}' > conftest.c
if $CC -Wall -Werror -c conftest.c > /dev/null 2>&1
then
AC_MSG_RESULT([yes])
AC_DEFINE(HAS_VISIBILITY_HIDDEN, 1, [Has visibility hidden])
else
AC_MSG_RESULT([no])
fi
rm -f conftest.c conftest.o
])
# FPTOOLS_FLOAT_WORD_ORDER_BIGENDIAN
# ----------------------------------
# Little endian Arm on Linux with some ABIs has big endian word order
......
......@@ -835,6 +835,8 @@ AC_COMPILE_IFELSE(
[AC_MSG_RESULT(no)])
CFLAGS="$CFLAGS2"
FP_VISIBILITY_HIDDEN
dnl ** check for librt
AC_CHECK_LIB(rt, clock_gettime)
AC_CHECK_FUNCS(clock_gettime timer_create timer_settime)
......
......@@ -51,7 +51,7 @@ extern "C" {
// Symbols that are extern, but private to the RTS, are declared
// with visibility "hidden" to hide them outside the RTS shared
// library.
#if !defined(mingw32_HOST_OS)
#if defined(HAS_VISIBILITY_HIDDEN)
#define RTS_PRIVATE GNUC3_ATTRIBUTE(visibility("hidden"))
#else
#define RTS_PRIVATE /* disabled: RTS_PRIVATE */
......
......@@ -5,6 +5,6 @@
/* On Windows, with gcc 4.5.0-1, using visibility hidden gives:
error: visibility attribute not supported in this configuration; ignored
*/
#if __GNUC__ >= 4 && !defined(freebsd_HOST_OS) && !defined(mingw32_HOST_OS)
#if defined(HAS_VISIBILITY_HIDDEN) && !defined(freebsd_HOST_OS)
#pragma GCC visibility push(hidden)
#endif
#if __GNUC__ >= 4 && !defined(freebsd_HOST_OS) && !defined(mingw32_HOST_OS)
#if defined(HAS_VISIBILITY_HIDDEN) && !defined(freebsd_HOST_OS)
#pragma GCC visibility pop
#endif
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