projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 4a626d0a | 1 | dnl A placeholder for <stddef.h>, for platforms that have issues. |
| c0c3707f CB |
2 | # stddef_h.m4 serial 6 |
| 3 | dnl Copyright (C) 2009-2019 Free Software Foundation, Inc. | |
| f434ba03 PA |
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]) | |
| 770d76d7 | 12 | STDDEF_H= |
| c0c3707f CB |
13 | |
| 14 | dnl Test whether the type max_align_t exists and whether its alignment | |
| 15 | dnl "is as great as is supported by the implementation in all contexts". | |
| 16 | AC_CACHE_CHECK([for good max_align_t], | |
| 17 | [gl_cv_type_max_align_t], | |
| 18 | [AC_COMPILE_IFELSE( | |
| 19 | [AC_LANG_PROGRAM( | |
| 20 | [[#include <stddef.h> | |
| 21 | unsigned int s = sizeof (max_align_t); | |
| 22 | #if defined __GNUC__ || defined __IBM__ALIGNOF__ | |
| 23 | int check1[2 * (__alignof__ (double) <= __alignof__ (max_align_t)) - 1]; | |
| 24 | int check2[2 * (__alignof__ (long double) <= __alignof__ (max_align_t)) - 1]; | |
| 25 | #endif | |
| 26 | ]])], | |
| 27 | [gl_cv_type_max_align_t=yes], | |
| 28 | [gl_cv_type_max_align_t=no]) | |
| 29 | ]) | |
| 30 | if test $gl_cv_type_max_align_t = no; then | |
| 31 | HAVE_MAX_ALIGN_T=0 | |
| 32 | STDDEF_H=stddef.h | |
| 33 | fi | |
| 34 | ||
| f434ba03 PA |
35 | if test $gt_cv_c_wchar_t = no; then |
| 36 | HAVE_WCHAR_T=0 | |
| 37 | STDDEF_H=stddef.h | |
| 38 | fi | |
| c0c3707f | 39 | |
| f434ba03 PA |
40 | AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions], |
| 41 | [gl_cv_decl_null_works], | |
| 42 | [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h> | |
| 43 | int test[2 * (sizeof NULL == sizeof (void *)) -1]; | |
| 44 | ]])], | |
| 45 | [gl_cv_decl_null_works=yes], | |
| 46 | [gl_cv_decl_null_works=no])]) | |
| 47 | if test $gl_cv_decl_null_works = no; then | |
| 48 | REPLACE_NULL=1 | |
| 49 | STDDEF_H=stddef.h | |
| 50 | fi | |
| c0c3707f | 51 | |
| 770d76d7 PA |
52 | AC_SUBST([STDDEF_H]) |
| 53 | AM_CONDITIONAL([GL_GENERATE_STDDEF_H], [test -n "$STDDEF_H"]) | |
| f434ba03 | 54 | if test -n "$STDDEF_H"; then |
| 770d76d7 | 55 | gl_NEXT_HEADERS([stddef.h]) |
| f434ba03 PA |
56 | fi |
| 57 | ]) | |
| 58 | ||
| 59 | AC_DEFUN([gl_STDDEF_MODULE_INDICATOR], | |
| 60 | [ | |
| 61 | dnl Use AC_REQUIRE here, so that the default settings are expanded once only. | |
| 62 | AC_REQUIRE([gl_STDDEF_H_DEFAULTS]) | |
| 63 | gl_MODULE_INDICATOR_SET_VARIABLE([$1]) | |
| 64 | ]) | |
| 65 | ||
| 66 | AC_DEFUN([gl_STDDEF_H_DEFAULTS], | |
| 67 | [ | |
| 68 | dnl Assume proper GNU behavior unless another module says otherwise. | |
| 69 | REPLACE_NULL=0; AC_SUBST([REPLACE_NULL]) | |
| 4a626d0a | 70 | HAVE_MAX_ALIGN_T=1; AC_SUBST([HAVE_MAX_ALIGN_T]) |
| f434ba03 | 71 | HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T]) |
| f434ba03 | 72 | ]) |