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annotate m4/include_next.m4 @ 17476:6057744acd2c default tip master

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author Karl Berry <karl@freefriends.org>
date Fri, 16 Aug 2013 06:32:22 -0700
parents e542fd46ad6f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1b99dc961823 Support for old NeXTstep 3.3 sed.
Bruno Haible <bruno@clisp.org>
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1 # include_next.m4 serial 23
17249
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Eric Blake <eblake@redhat.com>
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2 dnl Copyright (C) 2006-2013 Free Software Foundation, Inc.
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3 dnl This file is free software; the Free Software Foundation
1f6871379885 * modules/inttypes: New file.
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4 dnl gives unlimited permission to copy and/or distribute it,
1f6871379885 * modules/inttypes: New file.
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5 dnl with or without modifications, as long as this notice is preserved.
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6
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7 dnl From Paul Eggert and Derek Price.
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8
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9 dnl Sets INCLUDE_NEXT and PRAGMA_SYSTEM_HEADER.
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10 dnl
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11 dnl INCLUDE_NEXT expands to 'include_next' if the compiler supports it, or to
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12 dnl 'include' otherwise.
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13 dnl
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14 dnl INCLUDE_NEXT_AS_FIRST_DIRECTIVE expands to 'include_next' if the compiler
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15 dnl supports it in the special case that it is the first include directive in
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16 dnl the given file, or to 'include' otherwise.
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17 dnl
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18 dnl PRAGMA_SYSTEM_HEADER can be used in files that contain #include_next,
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19 dnl so as to avoid GCC warnings when the gcc option -pedantic is used.
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20 dnl '#pragma GCC system_header' has the same effect as if the file was found
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21 dnl through the include search path specified with '-isystem' options (as
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22 dnl opposed to the search path specified with '-I' options). Namely, gcc
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23 dnl does not warn about some things, and on some systems (Solaris and Interix)
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24 dnl __STDC__ evaluates to 0 instead of to 1. The latter is an undesired side
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25 dnl effect; we are therefore careful to use 'defined __STDC__' or '1' instead
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26 dnl of plain '__STDC__'.
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27 dnl
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28 dnl PRAGMA_COLUMNS can be used in files that override system header files, so
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29 dnl as to avoid compilation errors on HP NonStop systems when the gnulib file
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30 dnl is included by a system header file that does a "#pragma COLUMNS 80" (which
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31 dnl has the effect of truncating the lines of that file and all files that it
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32 dnl includes to 80 columns) and the gnulib file has lines longer than 80
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33 dnl columns.
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34
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35 AC_DEFUN([gl_INCLUDE_NEXT],
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36 [
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37 AC_LANG_PREPROC_REQUIRE()
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38 AC_CACHE_CHECK([whether the preprocessor supports include_next],
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39 [gl_cv_have_include_next],
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40 [rm -rf conftestd1a conftestd1b conftestd2
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41 mkdir conftestd1a conftestd1b conftestd2
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42 dnl IBM C 9.0, 10.1 (original versions, prior to the 2009-01 updates) on
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43 dnl AIX 6.1 support include_next when used as first preprocessor directive
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44 dnl in a file, but not when preceded by another include directive. Check
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45 dnl for this bug by including <stdio.h>.
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46 dnl Additionally, with this same compiler, include_next is a no-op when
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47 dnl used in a header file that was included by specifying its absolute
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48 dnl file name. Despite these two bugs, include_next is used in the
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49 dnl compiler's <math.h>. By virtue of the second bug, we need to use
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50 dnl include_next as well in this case.
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51 cat <<EOF > conftestd1a/conftest.h
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52 #define DEFINED_IN_CONFTESTD1
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53 #include_next <conftest.h>
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54 #ifdef DEFINED_IN_CONFTESTD2
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55 int foo;
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56 #else
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57 #error "include_next doesn't work"
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58 #endif
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59 EOF
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60 cat <<EOF > conftestd1b/conftest.h
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61 #define DEFINED_IN_CONFTESTD1
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62 #include <stdio.h>
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63 #include_next <conftest.h>
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64 #ifdef DEFINED_IN_CONFTESTD2
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65 int foo;
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66 #else
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67 #error "include_next doesn't work"
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68 #endif
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69 EOF
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70 cat <<EOF > conftestd2/conftest.h
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71 #ifndef DEFINED_IN_CONFTESTD1
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72 #error "include_next test doesn't work"
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73 #endif
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74 #define DEFINED_IN_CONFTESTD2
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75 EOF
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76 gl_save_CPPFLAGS="$CPPFLAGS"
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77 CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1b -Iconftestd2"
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78 dnl We intentionally avoid using AC_LANG_SOURCE here.
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79 AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[#include <conftest.h>]],
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80 [gl_cv_have_include_next=yes],
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81 [CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1a -Iconftestd2"
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82 AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[#include <conftest.h>]],
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83 [gl_cv_have_include_next=buggy],
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84 [gl_cv_have_include_next=no])
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85 ])
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86 CPPFLAGS="$gl_save_CPPFLAGS"
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87 rm -rf conftestd1a conftestd1b conftestd2
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88 ])
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89 PRAGMA_SYSTEM_HEADER=
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90 if test $gl_cv_have_include_next = yes; then
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91 INCLUDE_NEXT=include_next
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92 INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include_next
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93 if test -n "$GCC"; then
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94 PRAGMA_SYSTEM_HEADER='#pragma GCC system_header'
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95 fi
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96 else
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97 if test $gl_cv_have_include_next = buggy; then
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98 INCLUDE_NEXT=include
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99 INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include_next
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100 else
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101 INCLUDE_NEXT=include
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102 INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include
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103 fi
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104 fi
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105 AC_SUBST([INCLUDE_NEXT])
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106 AC_SUBST([INCLUDE_NEXT_AS_FIRST_DIRECTIVE])
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107 AC_SUBST([PRAGMA_SYSTEM_HEADER])
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108 AC_CACHE_CHECK([whether system header files limit the line length],
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109 [gl_cv_pragma_columns],
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110 [dnl HP NonStop systems, which define __TANDEM, have this misfeature.
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111 AC_EGREP_CPP([choke me],
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112 [
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113 #ifdef __TANDEM
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114 choke me
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115 #endif
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116 ],
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117 [gl_cv_pragma_columns=yes],
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118 [gl_cv_pragma_columns=no])
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119 ])
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120 if test $gl_cv_pragma_columns = yes; then
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121 PRAGMA_COLUMNS="#pragma COLUMNS 10000"
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122 else
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123 PRAGMA_COLUMNS=
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124 fi
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125 AC_SUBST([PRAGMA_COLUMNS])
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126 ])
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127
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128 # gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...)
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129 # ------------------------------------------
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130 # For each arg foo.h, if #include_next works, define NEXT_FOO_H to be
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131 # '<foo.h>'; otherwise define it to be
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132 # '"///usr/include/foo.h"', or whatever other absolute file name is suitable.
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133 # Also, if #include_next works as first preprocessing directive in a file,
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134 # define NEXT_AS_FIRST_DIRECTIVE_FOO_H to be '<foo.h>'; otherwise define it to
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135 # be
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136 # '"///usr/include/foo.h"', or whatever other absolute file name is suitable.
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137 # That way, a header file with the following line:
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138 # #@INCLUDE_NEXT@ @NEXT_FOO_H@
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139 # or
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140 # #@INCLUDE_NEXT_AS_FIRST_DIRECTIVE@ @NEXT_AS_FIRST_DIRECTIVE_FOO_H@
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141 # behaves (after sed substitution) as if it contained
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142 # #include_next <foo.h>
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143 # even if the compiler does not support include_next.
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144 # The three "///" are to pacify Sun C 5.8, which otherwise would say
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145 # "warning: #include of /usr/include/... may be non-portable".
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146 # Use '""', not '<>', so that the /// cannot be confused with a C99 comment.
9782
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147 # Note: This macro assumes that the header file is not empty after
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148 # preprocessing, i.e. it does not only define preprocessor macros but also
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149 # provides some type/enum definitions or function/variable declarations.
14211
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150 #
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151 # This macro also checks whether each header exists, by invoking
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152 # AC_CHECK_HEADERS_ONCE or AC_CHECK_HEADERS on each argument.
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153 AC_DEFUN([gl_CHECK_NEXT_HEADERS],
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154 [
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155 gl_NEXT_HEADERS_INTERNAL([$1], [check])
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156 ])
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157
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158 # gl_NEXT_HEADERS(HEADER1 HEADER2 ...)
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159 # ------------------------------------
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160 # Like gl_CHECK_NEXT_HEADERS, except do not check whether the headers exist.
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161 # This is suitable for headers like <stddef.h> that are standardized by C89
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162 # and therefore can be assumed to exist.
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163 AC_DEFUN([gl_NEXT_HEADERS],
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164 [
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165 gl_NEXT_HEADERS_INTERNAL([$1], [assume])
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166 ])
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167
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168 # The guts of gl_CHECK_NEXT_HEADERS and gl_NEXT_HEADERS.
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169 AC_DEFUN([gl_NEXT_HEADERS_INTERNAL],
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170 [
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171 AC_REQUIRE([gl_INCLUDE_NEXT])
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172 AC_REQUIRE([AC_CANONICAL_HOST])
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173
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174 m4_if([$2], [check],
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175 [AC_CHECK_HEADERS_ONCE([$1])
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176 ])
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177
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178 dnl FIXME: gl_next_header and gl_header_exists must be used unquoted
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179 dnl until we can assume autoconf 2.64 or newer.
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180 m4_foreach_w([gl_HEADER_NAME], [$1],
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181 [AS_VAR_PUSHDEF([gl_next_header],
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182 [gl_cv_next_]m4_defn([gl_HEADER_NAME]))
9004
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183 if test $gl_cv_have_include_next = yes; then
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184 AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>'])
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185 else
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186 AC_CACHE_CHECK(
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187 [absolute name of <]m4_defn([gl_HEADER_NAME])[>],
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188 m4_defn([gl_next_header]),
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189 [m4_if([$2], [check],
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190 [AS_VAR_PUSHDEF([gl_header_exists],
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191 [ac_cv_header_]m4_defn([gl_HEADER_NAME]))
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192 if test AS_VAR_GET(gl_header_exists) = yes; then
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193 AS_VAR_POPDEF([gl_header_exists])
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194 ])
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195 AC_LANG_CONFTEST(
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196 [AC_LANG_SOURCE(
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197 [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]]
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198 )])
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199 dnl AIX "xlc -E" and "cc -E" omit #line directives for header
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200 dnl files that contain only a #include of other header files and
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201 dnl no non-comment tokens of their own. This leads to a failure
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202 dnl to detect the absolute name of <dirent.h>, <signal.h>,
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203 dnl <poll.h> and others. The workaround is to force preservation
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204 dnl of comments through option -C. This ensures all necessary
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205 dnl #line directives are present. GCC supports option -C as well.
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diff changeset
206 case "$host_os" in
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diff changeset
207 aix*) gl_absname_cpp="$ac_cpp -C" ;;
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208 *) gl_absname_cpp="$ac_cpp" ;;
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diff changeset
209 esac
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210 changequote(,)
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diff changeset
211 case "$host_os" in
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diff changeset
212 mingw*)
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213 dnl For the sake of native Windows compilers (excluding gcc),
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214 dnl treat backslash as a directory separator, like /.
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215 dnl Actually, these compilers use a double-backslash as
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216 dnl directory separator, inside the
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diff changeset
217 dnl # line "filename"
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diff changeset
218 dnl directives.
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219 gl_dirsep_regex='[/\\]'
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220 ;;
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221 *)
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222 gl_dirsep_regex='\/'
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223 ;;
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224 esac
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225 dnl A sed expression that turns a string into a basic regular
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diff changeset
226 dnl expression, for use within "/.../".
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227 gl_make_literal_regex_sed='s,[]$^\\.*/[],\\&,g'
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228 changequote([,])
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229 gl_header_literal_regex=`echo ']m4_defn([gl_HEADER_NAME])[' \
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diff changeset
230 | sed -e "$gl_make_literal_regex_sed"`
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231 gl_absolute_header_sed="/${gl_dirsep_regex}${gl_header_literal_regex}/"'{
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232 s/.*"\(.*'"${gl_dirsep_regex}${gl_header_literal_regex}"'\)".*/\1/
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233 changequote(,)dnl
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234 s|^/[^/]|//&|
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235 changequote([,])dnl
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diff changeset
236 p
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diff changeset
237 q
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diff changeset
238 }'
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239 dnl eval is necessary to expand gl_absname_cpp.
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240 dnl Ultrix and Pyramid sh refuse to redirect output of eval,
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diff changeset
241 dnl so use subshell.
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diff changeset
242 AS_VAR_SET(gl_next_header,
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243 ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
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244 sed -n "$gl_absolute_header_sed"`'"'])
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245 m4_if([$2], [check],
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246 [else
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247 AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>'])
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248 fi
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249 ])
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250 ])
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251 fi
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252 AC_SUBST(
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253 AS_TR_CPP([NEXT_]m4_defn([gl_HEADER_NAME])),
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254 [AS_VAR_GET(gl_next_header)])
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255 if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then
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256 # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next'
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257 gl_next_as_first_directive='<'gl_HEADER_NAME'>'
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258 else
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259 # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include'
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260 gl_next_as_first_directive=AS_VAR_GET(gl_next_header)
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261 fi
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262 AC_SUBST(
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263 AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])),
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parents: 11170
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264 [$gl_next_as_first_directive])
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265 AS_VAR_POPDEF([gl_next_header])])
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266 ])
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267
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268 # Autoconf 2.68 added warnings for our use of AC_COMPILE_IFELSE;
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269 # this fallback is safe for all earlier autoconf versions.
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270 m4_define_default([AC_LANG_DEFINES_PROVIDED])