1 # Check for stdbool.h that conforms to C99. 2 3 dnl Copyright (C) 2002-2006, 2009-2012 Free Software Foundation, Inc. 4 dnl This file is free software; the Free Software Foundation 5 dnl gives unlimited permission to copy and/or distribute it, 6 dnl with or without modifications, as long as this notice is preserved. 7 8 #serial 5 9 10 # Prepare for substituting <stdbool.h> if it is not supported. 11 12 AC_DEFUN([AM_STDBOOL_H], 13 [ 14 AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) 15 16 # Define two additional variables used in the Makefile substitution. 17 18 if test "$ac_cv_header_stdbool_h" = yes; then 19 STDBOOL_H='' 20 else 21 STDBOOL_H='stdbool.h' 22 fi 23 AC_SUBST([STDBOOL_H]) 24 AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"]) 25 26 if test "$ac_cv_type__Bool" = yes; then 27 HAVE__BOOL=1 28 else 29 HAVE__BOOL=0 30 fi 31 AC_SUBST([HAVE__BOOL]) 32 ]) 33 34 # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future. 35 AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H]) 36 37 # This version of the macro is needed in autoconf <= 2.68. 38 39 AC_DEFUN([AC_CHECK_HEADER_STDBOOL], 40 [AC_CACHE_CHECK([for stdbool.h that conforms to C99], 41 [ac_cv_header_stdbool_h], 42 [AC_COMPILE_IFELSE( 43 [AC_LANG_PROGRAM( 44 [[ 45 #include <stdbool.h> 46 #ifndef bool 47 "error: bool is not defined" 48 #endif 49 #ifndef false 50 "error: false is not defined" 51 #endif 52 #if false 53 "error: false is not 0" 54 #endif 55 #ifndef true 56 "error: true is not defined" 57 #endif 58 #if true != 1 59 "error: true is not 1" 60 #endif 61 #ifndef __bool_true_false_are_defined 62 "error: __bool_true_false_are_defined is not defined" 63 #endif 64 65 struct s { _Bool s: 1; _Bool t; } s; 66 67 char a[true == 1 ? 1 : -1]; 68 char b[false == 0 ? 1 : -1]; 69 char c[__bool_true_false_are_defined == 1 ? 1 : -1]; 70 char d[(bool) 0.5 == true ? 1 : -1]; 71 /* See body of main program for 'e'. */ 72 char f[(_Bool) 0.0 == false ? 1 : -1]; 73 char g[true]; 74 char h[sizeof (_Bool)]; 75 char i[sizeof s.t]; 76 enum { j = false, k = true, l = false * true, m = true * 256 }; 77 /* The following fails for 78 HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ 79 _Bool n[m]; 80 char o[sizeof n == m * sizeof n[0] ? 1 : -1]; 81 char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; 82 /* Catch a bug in an HP-UX C compiler. See 83 http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html 84 http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html 85 */ 86 _Bool q = true; 87 _Bool *pq = &q; 88 ]], 89 [[ 90 bool e = &s; 91 *pq |= q; 92 *pq |= ! q; 93 /* Refer to every declared value, to avoid compiler optimizations. */ 94 return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l 95 + !m + !n + !o + !p + !q + !pq); 96 ]])], 97 [ac_cv_header_stdbool_h=yes], 98 [ac_cv_header_stdbool_h=no])]) 99 AC_CHECK_TYPES([_Bool]) 100 ]) 101
