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Annotation of embedaddon/libiconv/srcm4/stddef_h.m4, revision 1.1.1.1

1.1       misho       1: dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues.
                      2: # stddef_h.m4 serial 4
                      3: dnl Copyright (C) 2009-2011 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: AC_DEFUN([gl_STDDEF_H],
                      9: [
                     10:   AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
                     11:   AC_REQUIRE([gt_TYPE_WCHAR_T])
                     12:   STDDEF_H=
                     13:   if test $gt_cv_c_wchar_t = no; then
                     14:     HAVE_WCHAR_T=0
                     15:     STDDEF_H=stddef.h
                     16:   fi
                     17:   AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],
                     18:     [gl_cv_decl_null_works],
                     19:     [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>
                     20:       int test[2 * (sizeof NULL == sizeof (void *)) -1];
                     21: ]])],
                     22:       [gl_cv_decl_null_works=yes],
                     23:       [gl_cv_decl_null_works=no])])
                     24:   if test $gl_cv_decl_null_works = no; then
                     25:     REPLACE_NULL=1
                     26:     STDDEF_H=stddef.h
                     27:   fi
                     28:   AC_SUBST([STDDEF_H])
                     29:   AM_CONDITIONAL([GL_GENERATE_STDDEF_H], [test -n "$STDDEF_H"])
                     30:   if test -n "$STDDEF_H"; then
                     31:     gl_NEXT_HEADERS([stddef.h])
                     32:   fi
                     33: ])
                     34: 
                     35: AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
                     36: [
                     37:   dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
                     38:   AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
                     39:   gl_MODULE_INDICATOR_SET_VARIABLE([$1])
                     40: ])
                     41: 
                     42: AC_DEFUN([gl_STDDEF_H_DEFAULTS],
                     43: [
                     44:   dnl Assume proper GNU behavior unless another module says otherwise.
                     45:   REPLACE_NULL=0;                AC_SUBST([REPLACE_NULL])
                     46:   HAVE_WCHAR_T=1;                AC_SUBST([HAVE_WCHAR_T])
                     47: ])