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AC_DEFUN([RTEMS_CHECK_GCC_WEAK],[
AC_CACHE_CHECK([whether $CC supports function __attribute__((weak))],
[rtems_cv_cc_attribute_weak],[
AS_IF([test x"$GCC" = xyes],[
save_CFLAGS=$CFLAGS
CFLAGS=-Werror])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM(
[void myfunc(char c) __attribute__ ((weak));
void myfunc(char c) {}],
[])],
[rtems_cv_cc_attribute_weak=yes],
[rtems_cv_cc_attribute_weak=no])
AS_IF([test x"$GCC" = xyes],[
CFLAGS=$save_CFLAGS])
])
])
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