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authorRincewindsHat <12514511+RincewindsHat@users.noreply.github.com>2023-01-31 13:46:01 (GMT)
committerRincewindsHat <12514511+RincewindsHat@users.noreply.github.com>2023-01-31 13:46:01 (GMT)
commite8bd88d1fcded01ccd066572eeaae1b507989cb3 (patch)
treec8e7be6c07c6f635f6e803e6a6ba9e7a95fee7c0 /gl/m4/stddef_h.m4
parent2ad962c13473607ca0d974bfaa516a0ed53ec73d (diff)
downloadmonitoring-plugins-e8bd88d1fcded01ccd066572eeaae1b507989cb3.tar.gz
Sync with the latest Gnulib code 668c0b8ffa
Diffstat (limited to 'gl/m4/stddef_h.m4')
-rw-r--r--gl/m4/stddef_h.m481
1 files changed, 69 insertions, 12 deletions
diff --git a/gl/m4/stddef_h.m4 b/gl/m4/stddef_h.m4
index 5da8ab1..a2322eb 100644
--- a/gl/m4/stddef_h.m4
+++ b/gl/m4/stddef_h.m4
@@ -1,19 +1,61 @@
1dnl A placeholder for POSIX 2008 <stddef.h>, for platforms that have issues. 1# stddef_h.m4 serial 13
2# stddef_h.m4 serial 4 2dnl Copyright (C) 2009-2023 Free Software Foundation, Inc.
3dnl Copyright (C) 2009-2013 Free Software Foundation, Inc.
4dnl This file is free software; the Free Software Foundation 3dnl This file is free software; the Free Software Foundation
5dnl gives unlimited permission to copy and/or distribute it, 4dnl gives unlimited permission to copy and/or distribute it,
6dnl with or without modifications, as long as this notice is preserved. 5dnl with or without modifications, as long as this notice is preserved.
7 6
8AC_DEFUN([gl_STDDEF_H], 7dnl A placeholder for <stddef.h>, for platforms that have issues.
8
9AC_DEFUN_ONCE([gl_STDDEF_H],
9[ 10[
10 AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) 11 AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
11 AC_REQUIRE([gt_TYPE_WCHAR_T]) 12 AC_REQUIRE([gt_TYPE_WCHAR_T])
12 STDDEF_H= 13
14 dnl Persuade OpenBSD <stddef.h> to declare max_align_t.
15 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
16
17 GL_GENERATE_STDDEF_H=false
18
19 dnl Test whether the type max_align_t exists and whether its alignment
20 dnl "is as great as is supported by the implementation in all contexts".
21 AC_CACHE_CHECK([for good max_align_t],
22 [gl_cv_type_max_align_t],
23 [AC_COMPILE_IFELSE(
24 [AC_LANG_PROGRAM(
25 [[/* On FreeBSD 12.0/x86, max_align_t defined by <stddef.h> has
26 the correct alignment with the default (wrong) definition of
27 _Alignof, but a wrong alignment as soon as we activate an
28 ISO C compliant _Alignof definition. */
29 #if ((defined __GNUC__ && 4 <= __GNUC__) || defined __clang__) && !defined __cplusplus
30 #define _Alignof(type) __builtin_offsetof (struct { char __a; type __b; }, __b)
31 #endif
32 #include <stddef.h>
33 unsigned int s = sizeof (max_align_t);
34 #if defined __GNUC__ || defined __clang__ || defined __IBM__ALIGNOF__
35 int check1[2 * (__alignof__ (double) <= __alignof__ (max_align_t)) - 1];
36 int check2[2 * (__alignof__ (long double) <= __alignof__ (max_align_t)) - 1];
37 #endif
38 typedef struct { char a; max_align_t b; } max_helper;
39 typedef struct { char a; long b; } long_helper;
40 typedef struct { char a; double b; } double_helper;
41 typedef struct { char a; long double b; } long_double_helper;
42 int check3[2 * (offsetof (long_helper, b) <= offsetof (max_helper, b)) - 1];
43 int check4[2 * (offsetof (double_helper, b) <= offsetof (max_helper, b)) - 1];
44 int check5[2 * (offsetof (long_double_helper, b) <= offsetof (max_helper, b)) - 1];
45 ]])],
46 [gl_cv_type_max_align_t=yes],
47 [gl_cv_type_max_align_t=no])
48 ])
49 if test $gl_cv_type_max_align_t = no; then
50 HAVE_MAX_ALIGN_T=0
51 GL_GENERATE_STDDEF_H=true
52 fi
53
13 if test $gt_cv_c_wchar_t = no; then 54 if test $gt_cv_c_wchar_t = no; then
14 HAVE_WCHAR_T=0 55 HAVE_WCHAR_T=0
15 STDDEF_H=stddef.h 56 GL_GENERATE_STDDEF_H=true
16 fi 57 fi
58
17 AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions], 59 AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],
18 [gl_cv_decl_null_works], 60 [gl_cv_decl_null_works],
19 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h> 61 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>
@@ -23,25 +65,40 @@ AC_DEFUN([gl_STDDEF_H],
23 [gl_cv_decl_null_works=no])]) 65 [gl_cv_decl_null_works=no])])
24 if test $gl_cv_decl_null_works = no; then 66 if test $gl_cv_decl_null_works = no; then
25 REPLACE_NULL=1 67 REPLACE_NULL=1
26 STDDEF_H=stddef.h 68 GL_GENERATE_STDDEF_H=true
27 fi 69 fi
28 AC_SUBST([STDDEF_H]) 70
29 AM_CONDITIONAL([GL_GENERATE_STDDEF_H], [test -n "$STDDEF_H"]) 71 if $GL_GENERATE_STDDEF_H; then
30 if test -n "$STDDEF_H"; then
31 gl_NEXT_HEADERS([stddef.h]) 72 gl_NEXT_HEADERS([stddef.h])
32 fi 73 fi
33]) 74])
34 75
76# gl_STDDEF_MODULE_INDICATOR([modulename])
77# sets the shell variable that indicates the presence of the given module
78# to a C preprocessor expression that will evaluate to 1.
79# This macro invocation must not occur in macros that are AC_REQUIREd.
35AC_DEFUN([gl_STDDEF_MODULE_INDICATOR], 80AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
36[ 81[
37 dnl Use AC_REQUIRE here, so that the default settings are expanded once only. 82 dnl Ensure to expand the default settings once only.
38 AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) 83 gl_STDDEF_H_REQUIRE_DEFAULTS
39 gl_MODULE_INDICATOR_SET_VARIABLE([$1]) 84 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
40]) 85])
41 86
87# Initializes the default values for AC_SUBSTed shell variables.
88# This macro must not be AC_REQUIREd. It must only be invoked, and only
89# outside of macros or in macros that are not AC_REQUIREd.
90AC_DEFUN([gl_STDDEF_H_REQUIRE_DEFAULTS],
91[
92 m4_defun(GL_MODULE_INDICATOR_PREFIX[_STDDEF_H_MODULE_INDICATOR_DEFAULTS], [
93 ])
94 m4_require(GL_MODULE_INDICATOR_PREFIX[_STDDEF_H_MODULE_INDICATOR_DEFAULTS])
95 AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
96])
97
42AC_DEFUN([gl_STDDEF_H_DEFAULTS], 98AC_DEFUN([gl_STDDEF_H_DEFAULTS],
43[ 99[
44 dnl Assume proper GNU behavior unless another module says otherwise. 100 dnl Assume proper GNU behavior unless another module says otherwise.
45 REPLACE_NULL=0; AC_SUBST([REPLACE_NULL]) 101 REPLACE_NULL=0; AC_SUBST([REPLACE_NULL])
102 HAVE_MAX_ALIGN_T=1; AC_SUBST([HAVE_MAX_ALIGN_T])
46 HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T]) 103 HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T])
47]) 104])