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relocatable-prog: Update documentation. * doc/relocatable-maint.texi (Supporting Relocation): Update to match the recent changes.
author Bruno Haible <bruno@clisp.org>
date Sun, 24 Feb 2019 01:49:15 +0100
parents b06060465f09
children
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06d818b9ca43 stddef: support C11's max_align_t
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1 dnl A placeholder for <stddef.h>, for platforms that have issues.
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2 # stddef_h.m4 serial 6
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3 dnl Copyright (C) 2009-2019 Free Software Foundation, Inc.
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4 dnl This file is free software; the Free Software Foundation
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5 dnl gives unlimited permission to copy and/or distribute it,
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6 dnl with or without modifications, as long as this notice is preserved.
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7
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8 AC_DEFUN([gl_STDDEF_H],
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9 [
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10 AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
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11 AC_REQUIRE([gt_TYPE_WCHAR_T])
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12 STDDEF_H=
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13
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14 dnl Test whether the type max_align_t exists and whether its alignment
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15 dnl "is as great as is supported by the implementation in all contexts".
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16 AC_CACHE_CHECK([for good max_align_t],
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17 [gl_cv_type_max_align_t],
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18 [AC_COMPILE_IFELSE(
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19 [AC_LANG_PROGRAM(
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20 [[#include <stddef.h>
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21 unsigned int s = sizeof (max_align_t);
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22 #if defined __GNUC__ || defined __IBM__ALIGNOF__
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23 int check1[2 * (__alignof__ (double) <= __alignof__ (max_align_t)) - 1];
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24 int check2[2 * (__alignof__ (long double) <= __alignof__ (max_align_t)) - 1];
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25 #endif
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26 ]])],
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27 [gl_cv_type_max_align_t=yes],
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28 [gl_cv_type_max_align_t=no])
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29 ])
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30 if test $gl_cv_type_max_align_t = no; then
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31 HAVE_MAX_ALIGN_T=0
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32 STDDEF_H=stddef.h
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33 fi
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34
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35 if test $gt_cv_c_wchar_t = no; then
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36 HAVE_WCHAR_T=0
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37 STDDEF_H=stddef.h
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38 fi
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39
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40 AC_CACHE_CHECK([whether NULL can be used in arbitrary expressions],
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41 [gl_cv_decl_null_works],
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42 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stddef.h>
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43 int test[2 * (sizeof NULL == sizeof (void *)) -1];
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44 ]])],
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45 [gl_cv_decl_null_works=yes],
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46 [gl_cv_decl_null_works=no])])
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47 if test $gl_cv_decl_null_works = no; then
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48 REPLACE_NULL=1
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49 STDDEF_H=stddef.h
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50 fi
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51
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52 AC_SUBST([STDDEF_H])
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53 AM_CONDITIONAL([GL_GENERATE_STDDEF_H], [test -n "$STDDEF_H"])
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54 if test -n "$STDDEF_H"; then
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55 gl_NEXT_HEADERS([stddef.h])
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56 fi
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57 ])
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58
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59 AC_DEFUN([gl_STDDEF_MODULE_INDICATOR],
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60 [
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61 dnl Use AC_REQUIRE here, so that the default settings are expanded once only.
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62 AC_REQUIRE([gl_STDDEF_H_DEFAULTS])
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63 gl_MODULE_INDICATOR_SET_VARIABLE([$1])
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64 ])
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65
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66 AC_DEFUN([gl_STDDEF_H_DEFAULTS],
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67 [
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68 dnl Assume proper GNU behavior unless another module says otherwise.
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69 REPLACE_NULL=0; AC_SUBST([REPLACE_NULL])
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70 HAVE_MAX_ALIGN_T=1; AC_SUBST([HAVE_MAX_ALIGN_T])
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71 HAVE_WCHAR_T=1; AC_SUBST([HAVE_WCHAR_T])
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72 ])