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1 | office | 1 | # include_next.m4 serial 20 |
2 | dnl Copyright (C) 2006-2011 Free Software Foundation, Inc. |
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3 | dnl This file is free software; the Free Software Foundation |
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4 | dnl gives unlimited permission to copy and/or distribute it, |
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5 | dnl with or without modifications, as long as this notice is preserved. |
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6 | |||
7 | dnl From Paul Eggert and Derek Price. |
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8 | |||
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 | |||
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 | |||
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. |
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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. |
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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 | |||
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 | |||
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 | |||
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 | |||
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])) |
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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([$2], [check], |
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190 | [AS_VAR_PUSHDEF([gl_header_exists], |
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191 | [ac_cv_header_]m4_defn([gl_HEADER_NAME])) |
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192 | if test AS_VAR_GET(gl_header_exists) = yes; then |
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193 | AS_VAR_POPDEF([gl_header_exists]) |
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194 | ]) |
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195 | AC_LANG_CONFTEST( |
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196 | [AC_LANG_SOURCE( |
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197 | [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]] |
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198 | )]) |
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199 | dnl AIX "xlc -E" and "cc -E" omit #line directives for header |
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200 | dnl files that contain only a #include of other header files and |
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201 | dnl no non-comment tokens of their own. This leads to a failure |
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202 | dnl to detect the absolute name of <dirent.h>, <signal.h>, |
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203 | dnl <poll.h> and others. The workaround is to force preservation |
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204 | dnl of comments through option -C. This ensures all necessary |
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205 | dnl #line directives are present. GCC supports option -C as well. |
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206 | case "$host_os" in |
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207 | aix*) gl_absname_cpp="$ac_cpp -C" ;; |
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208 | *) gl_absname_cpp="$ac_cpp" ;; |
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209 | esac |
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210 | dnl eval is necessary to expand gl_absname_cpp. |
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211 | dnl Ultrix and Pyramid sh refuse to redirect output of eval, |
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212 | dnl so use subshell. |
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213 | AS_VAR_SET(gl_next_header, |
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214 | ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | |
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215 | sed -n '\#/]m4_defn([gl_HEADER_NAME])[#{ |
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216 | s#.*"\(.*/]m4_defn([gl_HEADER_NAME])[\)".*#\1# |
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217 | s#^/[^/]#//&# |
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218 | p |
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219 | q |
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220 | }'`'"']) |
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221 | m4_if([$2], [check], |
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222 | [else |
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223 | AS_VAR_SET(gl_next_header, ['<'gl_HEADER_NAME'>']) |
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224 | fi |
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225 | ]) |
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226 | ]) |
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227 | fi |
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228 | AC_SUBST( |
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229 | AS_TR_CPP([NEXT_]m4_defn([gl_HEADER_NAME])), |
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230 | [AS_VAR_GET(gl_next_header)]) |
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231 | if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then |
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232 | # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next' |
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233 | gl_next_as_first_directive='<'gl_HEADER_NAME'>' |
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234 | else |
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235 | # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include' |
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236 | gl_next_as_first_directive=AS_VAR_GET(gl_next_header) |
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237 | fi |
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238 | AC_SUBST( |
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239 | AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])), |
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240 | [$gl_next_as_first_directive]) |
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241 | AS_VAR_POPDEF([gl_next_header])]) |
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242 | ]) |
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243 | |||
244 | # Autoconf 2.68 added warnings for our use of AC_COMPILE_IFELSE; |
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245 | # this fallback is safe for all earlier autoconf versions. |
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246 | m4_define_default([AC_LANG_DEFINES_PROVIDED]) |