acattribute.m4

gcc的组建

dnl modified AC_C_INLINE from autoconf/c.m4

AN_IDENTIFIER([attribute], [AC_C_ATTRIBUTE])
AC_DEFUN([AC_C_ATTRIBUTE],
[AC_CACHE_CHECK([for __attribute__], ac_cv_c_attribute,
[
AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[void foo(void) __attribute__ ((__noreturn__));]
)],
[ac_cv_c_attribute=yes],
[ac_cv_c_attribute=no]
)
])
AH_VERBATIM([attribute],
[/* Define to `__attribute__' to nothing if it's not supported.  */
#undef __attribute__])
case $ac_cv_c_attribute in
  yes) ;;
  no)
    cat >>confdefs.h <<_ACEOF
#define __attribute__(x)    /* nothing */
_ACEOF
    ;;
esac
])# AC_C_ATTRIBUTE