Index: bison/src/bison/2.4.1/bison-2.4.1-src/m4/stdbool.m4 |
=================================================================== |
--- bison/src/bison/2.4.1/bison-2.4.1-src/m4/stdbool.m4 (revision 0) |
+++ bison/src/bison/2.4.1/bison-2.4.1-src/m4/stdbool.m4 (revision 0) |
@@ -0,0 +1,115 @@ |
+# Check for stdbool.h that conforms to C99. |
+ |
+dnl Copyright (C) 2002-2006 Free Software Foundation, Inc. |
+dnl This file is free software; the Free Software Foundation |
+dnl gives unlimited permission to copy and/or distribute it, |
+dnl with or without modifications, as long as this notice is preserved. |
+ |
+# Prepare for substituting <stdbool.h> if it is not supported. |
+ |
+AC_DEFUN([AM_STDBOOL_H], |
+[ |
+ AC_REQUIRE([AC_HEADER_STDBOOL]) |
+ |
+ # Define two additional variables used in the Makefile substitution. |
+ |
+ if test "$ac_cv_header_stdbool_h" = yes; then |
+ STDBOOL_H='' |
+ else |
+ STDBOOL_H='stdbool.h' |
+ fi |
+ AC_SUBST([STDBOOL_H]) |
+ |
+ if test "$ac_cv_type__Bool" = yes; then |
+ HAVE__BOOL=1 |
+ else |
+ HAVE__BOOL=0 |
+ fi |
+ AC_SUBST([HAVE__BOOL]) |
+]) |
+ |
+# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future. |
+AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H]) |
+ |
+# This macro is only needed in autoconf <= 2.59. Newer versions of autoconf |
+# have this macro built-in. |
+ |
+AC_DEFUN([AC_HEADER_STDBOOL], |
+ [AC_CACHE_CHECK([for stdbool.h that conforms to C99], |
+ [ac_cv_header_stdbool_h], |
+ [AC_TRY_COMPILE( |
+ [ |
+ #include <stdbool.h> |
+ #ifndef bool |
+ "error: bool is not defined" |
+ #endif |
+ #ifndef false |
+ "error: false is not defined" |
+ #endif |
+ #if false |
+ "error: false is not 0" |
+ #endif |
+ #ifndef true |
+ "error: true is not defined" |
+ #endif |
+ #if true != 1 |
+ "error: true is not 1" |
+ #endif |
+ #ifndef __bool_true_false_are_defined |
+ "error: __bool_true_false_are_defined is not defined" |
+ #endif |
+ |
+ struct s { _Bool s: 1; _Bool t; } s; |
+ |
+ char a[true == 1 ? 1 : -1]; |
+ char b[false == 0 ? 1 : -1]; |
+ char c[__bool_true_false_are_defined == 1 ? 1 : -1]; |
+ char d[(bool) 0.5 == true ? 1 : -1]; |
+ bool e = &s; |
+ char f[(_Bool) 0.0 == false ? 1 : -1]; |
+ char g[true]; |
+ char h[sizeof (_Bool)]; |
+ char i[sizeof s.t]; |
+ enum { j = false, k = true, l = false * true, m = true * 256 }; |
+ _Bool n[m]; |
+ char o[sizeof n == m * sizeof n[0] ? 1 : -1]; |
+ char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; |
+ #if defined __xlc__ || defined __GNUC__ |
+ /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0 |
+ reported by James Lemley on 2005-10-05; see |
+ http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html |
+ This test is not quite right, since xlc is allowed to |
+ reject this program, as the initializer for xlcbug is |
+ not one of the forms that C requires support for. |
+ However, doing the test right would require a run-time |
+ test, and that would make cross-compilation harder. |
+ Let us hope that IBM fixes the xlc bug, and also adds |
+ support for this kind of constant expression. In the |
+ meantime, this test will reject xlc, which is OK, since |
+ our stdbool.h substitute should suffice. We also test |
+ this with GCC, where it should work, to detect more |
+ quickly whether someone messes up the test in the |
+ future. */ |
+ char digs[] = "0123456789"; |
+ int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1); |
+ #endif |
+ /* Catch a bug in an HP-UX C compiler. See |
+ http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html |
+ http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html |
+ */ |
+ _Bool q = true; |
+ _Bool *pq = &q; |
+ ], |
+ [ |
+ *pq |= q; |
+ *pq |= ! q; |
+ /* Refer to every declared value, to avoid compiler optimizations. */ |
+ return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l |
+ + !m + !n + !o + !p + !q + !pq); |
+ ], |
+ [ac_cv_header_stdbool_h=yes], |
+ [ac_cv_header_stdbool_h=no])]) |
+ AC_CHECK_TYPES([_Bool]) |
+ if test $ac_cv_header_stdbool_h = yes; then |
+ AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.]) |
+ fi]) |