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dnl Detection and configuration of the visibility feature of gcc
dnl Vincent Torri 2006-02-11
dnl
dnl GCC_CHECK_VISIBILITY([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
dnl Check the visibility feature of gcc
dnl
AC_DEFUN([GCC_CHECK_VISIBILITY],
[AC_MSG_CHECKING([whether ${CC} supports symbol visibility])
save_CFLAGS=${CFLAGS}
CFLAGS="$CFLAGS -fvisibility=hidden -fvisibility-inlines-hidden"
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[
#pragma GCC visibility push(hidden)
extern void f(int);
#pragma GCC visibility pop
]],
[[]]
)],
[AC_DEFINE(
GCC_HAS_VISIBILITY,
[],
[Defined if GCC supports the visibility feature])
m4_if([$1], [], [:], [$1])
AC_MSG_RESULT(yes)],
[m4_if([$2], [], [:], [$2])
AC_MSG_RESULT(no)])
CFLAGS=${save_CFLAGS}
])
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