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Diffstat (limited to 'm4/include_next.m4')
-rw-r--r-- | m4/include_next.m4 | 244 |
1 files changed, 0 insertions, 244 deletions
diff --git a/m4/include_next.m4 b/m4/include_next.m4 deleted file mode 100644 index b3c784918..000000000 --- a/m4/include_next.m4 +++ /dev/null | |||
@@ -1,244 +0,0 @@ | |||
1 | # include_next.m4 serial 18 | ||
2 | dnl Copyright (C) 2006-2011 Free Software Foundation, Inc. | ||
3 | dnl This file is free software; the Free Software Foundation | ||
4 | dnl gives unlimited permission to copy and/or distribute it, | ||
5 | dnl with or without modifications, as long as this notice is preserved. | ||
6 | |||
7 | dnl From Paul Eggert and Derek Price. | ||
8 | |||
9 | dnl Sets INCLUDE_NEXT and PRAGMA_SYSTEM_HEADER. | ||
10 | dnl | ||
11 | dnl INCLUDE_NEXT expands to 'include_next' if the compiler supports it, or to | ||
12 | dnl 'include' otherwise. | ||
13 | dnl | ||
14 | dnl INCLUDE_NEXT_AS_FIRST_DIRECTIVE expands to 'include_next' if the compiler | ||
15 | dnl supports it in the special case that it is the first include directive in | ||
16 | dnl the given file, or to 'include' otherwise. | ||
17 | dnl | ||
18 | dnl PRAGMA_SYSTEM_HEADER can be used in files that contain #include_next, | ||
19 | dnl so as to avoid GCC warnings when the gcc option -pedantic is used. | ||
20 | dnl '#pragma GCC system_header' has the same effect as if the file was found | ||
21 | dnl through the include search path specified with '-isystem' options (as | ||
22 | dnl opposed to the search path specified with '-I' options). Namely, gcc | ||
23 | dnl does not warn about some things, and on some systems (Solaris and Interix) | ||
24 | dnl __STDC__ evaluates to 0 instead of to 1. The latter is an undesired side | ||
25 | dnl effect; we are therefore careful to use 'defined __STDC__' or '1' instead | ||
26 | dnl of plain '__STDC__'. | ||
27 | dnl | ||
28 | dnl PRAGMA_COLUMNS can be used in files that override system header files, so | ||
29 | dnl as to avoid compilation errors on HP NonStop systems when the gnulib file | ||
30 | dnl is included by a system header file that does a "#pragma COLUMNS 80" (which | ||
31 | dnl has the effect of truncating the lines of that file and all files that it | ||
32 | dnl includes to 80 columns) and the gnulib file has lines longer than 80 | ||
33 | dnl columns. | ||
34 | |||
35 | AC_DEFUN([gl_INCLUDE_NEXT], | ||
36 | [ | ||
37 | AC_LANG_PREPROC_REQUIRE() | ||
38 | AC_CACHE_CHECK([whether the preprocessor supports include_next], | ||
39 | [gl_cv_have_include_next], | ||
40 | [rm -rf conftestd1a conftestd1b conftestd2 | ||
41 | mkdir conftestd1a conftestd1b conftestd2 | ||
42 | dnl IBM C 9.0, 10.1 (original versions, prior to the 2009-01 updates) on | ||
43 | dnl AIX 6.1 support include_next when used as first preprocessor directive | ||
44 | dnl in a file, but not when preceded by another include directive. Check | ||
45 | dnl for this bug by including <stdio.h>. | ||
46 | dnl Additionally, with this same compiler, include_next is a no-op when | ||
47 | dnl used in a header file that was included by specifying its absolute | ||
48 | dnl file name. Despite these two bugs, include_next is used in the | ||
49 | dnl compiler's <math.h>. By virtue of the second bug, we need to use | ||
50 | dnl include_next as well in this case. | ||
51 | cat <<EOF > conftestd1a/conftest.h | ||
52 | #define DEFINED_IN_CONFTESTD1 | ||
53 | #include_next <conftest.h> | ||
54 | #ifdef DEFINED_IN_CONFTESTD2 | ||
55 | int foo; | ||
56 | #else | ||
57 | #error "include_next doesn't work" | ||
58 | #endif | ||
59 | EOF | ||
60 | cat <<EOF > conftestd1b/conftest.h | ||
61 | #define DEFINED_IN_CONFTESTD1 | ||
62 | #include <stdio.h> | ||
63 | #include_next <conftest.h> | ||
64 | #ifdef DEFINED_IN_CONFTESTD2 | ||
65 | int foo; | ||
66 | #else | ||
67 | #error "include_next doesn't work" | ||
68 | #endif | ||
69 | EOF | ||
70 | cat <<EOF > conftestd2/conftest.h | ||
71 | #ifndef DEFINED_IN_CONFTESTD1 | ||
72 | #error "include_next test doesn't work" | ||
73 | #endif | ||
74 | #define DEFINED_IN_CONFTESTD2 | ||
75 | EOF | ||
76 | gl_save_CPPFLAGS="$CPPFLAGS" | ||
77 | CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1b -Iconftestd2" | ||
78 | dnl We intentionally avoid using AC_LANG_SOURCE here. | ||
79 | AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[#include <conftest.h>]], | ||
80 | [gl_cv_have_include_next=yes], | ||
81 | [CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1a -Iconftestd2" | ||
82 | AC_COMPILE_IFELSE([AC_LANG_DEFINES_PROVIDED[#include <conftest.h>]], | ||
83 | [gl_cv_have_include_next=buggy], | ||
84 | [gl_cv_have_include_next=no]) | ||
85 | ]) | ||
86 | CPPFLAGS="$gl_save_CPPFLAGS" | ||
87 | rm -rf conftestd1a conftestd1b conftestd2 | ||
88 | ]) | ||
89 | PRAGMA_SYSTEM_HEADER= | ||
90 | if test $gl_cv_have_include_next = yes; then | ||
91 | INCLUDE_NEXT=include_next | ||
92 | INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include_next | ||
93 | if test -n "$GCC"; then | ||
94 | PRAGMA_SYSTEM_HEADER='#pragma GCC system_header' | ||
95 | fi | ||
96 | else | ||
97 | if test $gl_cv_have_include_next = buggy; then | ||
98 | INCLUDE_NEXT=include | ||
99 | INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include_next | ||
100 | else | ||
101 | INCLUDE_NEXT=include | ||
102 | INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include | ||
103 | fi | ||
104 | fi | ||
105 | AC_SUBST([INCLUDE_NEXT]) | ||
106 | AC_SUBST([INCLUDE_NEXT_AS_FIRST_DIRECTIVE]) | ||
107 | AC_SUBST([PRAGMA_SYSTEM_HEADER]) | ||
108 | AC_CACHE_CHECK([whether system header files limit the line length], | ||
109 | [gl_cv_pragma_columns], | ||
110 | [dnl HP NonStop systems, which define __TANDEM, have this misfeature. | ||
111 | AC_EGREP_CPP([choke me], | ||
112 | [ | ||
113 | #ifdef __TANDEM | ||
114 | choke me | ||
115 | #endif | ||
116 | ], | ||
117 | [gl_cv_pragma_columns=yes], | ||
118 | [gl_cv_pragma_columns=no]) | ||
119 | ]) | ||
120 | if test $gl_cv_pragma_columns = yes; then | ||
121 | PRAGMA_COLUMNS="#pragma COLUMNS 10000" | ||
122 | else | ||
123 | PRAGMA_COLUMNS= | ||
124 | fi | ||
125 | AC_SUBST([PRAGMA_COLUMNS]) | ||
126 | ]) | ||
127 | |||
128 | # gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...) | ||
129 | # ------------------------------------------ | ||
130 | # For each arg foo.h, if #include_next works, define NEXT_FOO_H to be | ||
131 | # '<foo.h>'; otherwise define it to be | ||
132 | # '"///usr/include/foo.h"', or whatever other absolute file name is suitable. | ||
133 | # Also, if #include_next works as first preprocessing directive in a file, | ||
134 | # define NEXT_AS_FIRST_DIRECTIVE_FOO_H to be '<foo.h>'; otherwise define it to | ||
135 | # be | ||
136 | # '"///usr/include/foo.h"', or whatever other absolute file name is suitable. | ||
137 | # That way, a header file with the following line: | ||
138 | # #@INCLUDE_NEXT@ @NEXT_FOO_H@ | ||
139 | # or | ||
140 | # #@INCLUDE_NEXT_AS_FIRST_DIRECTIVE@ @NEXT_AS_FIRST_DIRECTIVE_FOO_H@ | ||
141 | # behaves (after sed substitution) as if it contained | ||
142 | # #include_next <foo.h> | ||
143 | # even if the compiler does not support include_next. | ||
144 | # The three "///" are to pacify Sun C 5.8, which otherwise would say | ||
145 | # "warning: #include of /usr/include/... may be non-portable". | ||
146 | # Use `""', not `<>', so that the /// cannot be confused with a C99 comment. | ||
147 | # Note: This macro assumes that the header file is not empty after | ||
148 | # preprocessing, i.e. it does not only define preprocessor macros but also | ||
149 | # provides some type/enum definitions or function/variable declarations. | ||
150 | # | ||
151 | # This macro also checks whether each header exists, by invoking | ||
152 | # AC_CHECK_HEADERS_ONCE or AC_CHECK_HEADERS on each argument. | ||
153 | AC_DEFUN([gl_CHECK_NEXT_HEADERS], | ||
154 | [ | ||
155 | gl_NEXT_HEADERS_INTERNAL([$1], [check]) | ||
156 | ]) | ||
157 | |||
158 | # gl_NEXT_HEADERS(HEADER1 HEADER2 ...) | ||
159 | # ------------------------------------ | ||
160 | # Like gl_CHECK_NEXT_HEADERS, except do not check whether the headers exist. | ||
161 | # This is suitable for headers like <stddef.h> that are standardized by C89 | ||
162 | # and therefore can be assumed to exist. | ||
163 | AC_DEFUN([gl_NEXT_HEADERS], | ||
164 | [ | ||
165 | gl_NEXT_HEADERS_INTERNAL([$1], [assume]) | ||
166 | ]) | ||
167 | |||
168 | # The guts of gl_CHECK_NEXT_HEADERS and gl_NEXT_HEADERS. | ||
169 | AC_DEFUN([gl_NEXT_HEADERS_INTERNAL], | ||
170 | [ | ||
171 | AC_REQUIRE([gl_INCLUDE_NEXT]) | ||
172 | AC_REQUIRE([AC_CANONICAL_HOST]) | ||
173 | |||
174 | m4_if([$2], [check], | ||
175 | [AC_CHECK_HEADERS_ONCE([$1]) | ||
176 | ]) | ||
177 | |||
178 | m4_foreach_w([gl_HEADER_NAME], [$1], | ||
179 | [AS_VAR_PUSHDEF([gl_next_header], | ||
180 | [gl_cv_next_]m4_defn([gl_HEADER_NAME])) | ||
181 | if test $gl_cv_have_include_next = yes; then | ||
182 | AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) | ||
183 | else | ||
184 | AC_CACHE_CHECK( | ||
185 | [absolute name of <]m4_defn([gl_HEADER_NAME])[>], | ||
186 | m4_defn([gl_next_header]), | ||
187 | [m4_if([$2], [check], | ||
188 | [AS_VAR_PUSHDEF([gl_header_exists], | ||
189 | [ac_cv_header_]m4_defn([gl_HEADER_NAME])) | ||
190 | if test AS_VAR_GET(gl_header_exists) = yes; then | ||
191 | AS_VAR_POPDEF([gl_header_exists]) | ||
192 | ]) | ||
193 | AC_LANG_CONFTEST( | ||
194 | [AC_LANG_SOURCE( | ||
195 | [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]] | ||
196 | )]) | ||
197 | dnl AIX "xlc -E" and "cc -E" omit #line directives for header | ||
198 | dnl files that contain only a #include of other header files and | ||
199 | dnl no non-comment tokens of their own. This leads to a failure | ||
200 | dnl to detect the absolute name of <dirent.h>, <signal.h>, | ||
201 | dnl <poll.h> and others. The workaround is to force preservation | ||
202 | dnl of comments through option -C. This ensures all necessary | ||
203 | dnl #line directives are present. GCC supports option -C as well. | ||
204 | case "$host_os" in | ||
205 | aix*) gl_absname_cpp="$ac_cpp -C" ;; | ||
206 | *) gl_absname_cpp="$ac_cpp" ;; | ||
207 | esac | ||
208 | dnl eval is necessary to expand gl_absname_cpp. | ||
209 | dnl Ultrix and Pyramid sh refuse to redirect output of eval, | ||
210 | dnl so use subshell. | ||
211 | AS_VAR_SET([gl_next_header], | ||
212 | ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | | ||
213 | sed -n '\#/]m4_defn([gl_HEADER_NAME])[#{ | ||
214 | s#.*"\(.*/]m4_defn([gl_HEADER_NAME])[\)".*#\1# | ||
215 | s#^/[^/]#//&# | ||
216 | p | ||
217 | q | ||
218 | }'`'"']) | ||
219 | m4_if([$2], [check], | ||
220 | [else | ||
221 | AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) | ||
222 | fi | ||
223 | ]) | ||
224 | ]) | ||
225 | fi | ||
226 | AC_SUBST( | ||
227 | AS_TR_CPP([NEXT_]m4_defn([gl_HEADER_NAME])), | ||
228 | [AS_VAR_GET([gl_next_header])]) | ||
229 | if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then | ||
230 | # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next' | ||
231 | gl_next_as_first_directive='<'gl_HEADER_NAME'>' | ||
232 | else | ||
233 | # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include' | ||
234 | gl_next_as_first_directive=AS_VAR_GET([gl_next_header]) | ||
235 | fi | ||
236 | AC_SUBST( | ||
237 | AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])), | ||
238 | [$gl_next_as_first_directive]) | ||
239 | AS_VAR_POPDEF([gl_next_header])]) | ||
240 | ]) | ||
241 | |||
242 | # Autoconf 2.68 added warnings for our use of AC_COMPILE_IFELSE; | ||
243 | # this fallback is safe for all earlier autoconf versions. | ||
244 | m4_define_default([AC_LANG_DEFINES_PROVIDED]) | ||