Commit | Line | Data |
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f6ea5628 | 1 | # include_next.m4 serial 4 |
4c38e0a4 | 2 | dnl Copyright (C) 2006, 2007, 2009, 2010 Free Software Foundation, Inc. |
f6ea5628 DJ |
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 | AC_DEFUN([gl_INCLUDE_NEXT], | |
10 | [ | |
11 | AC_LANG_PREPROC_REQUIRE() | |
12 | AC_CACHE_CHECK([whether the preprocessor supports include_next], | |
13 | [gl_cv_have_include_next], | |
14 | [rm -rf conftestd1 conftestd2 | |
15 | mkdir conftestd1 conftestd2 | |
16 | cat <<EOF > conftestd1/conftest.h | |
17 | #define DEFINED_IN_CONFTESTD1 | |
18 | #include_next <conftest.h> | |
19 | #ifdef DEFINED_IN_CONFTESTD2 | |
20 | int foo; | |
21 | #else | |
22 | #error "include_next doesn't work" | |
23 | #endif | |
24 | EOF | |
25 | cat <<EOF > conftestd2/conftest.h | |
26 | #ifndef DEFINED_IN_CONFTESTD1 | |
27 | #error "include_next test doesn't work" | |
28 | #endif | |
29 | #define DEFINED_IN_CONFTESTD2 | |
30 | EOF | |
31 | save_CPPFLAGS="$CPPFLAGS" | |
32 | CPPFLAGS="$CPPFLAGS -Iconftestd1 -Iconftestd2" | |
33 | AC_COMPILE_IFELSE([#include <conftest.h>], | |
34 | [gl_cv_have_include_next=yes], | |
35 | [gl_cv_have_include_next=no]) | |
36 | CPPFLAGS="$save_CPPFLAGS" | |
37 | rm -rf conftestd1 conftestd2 | |
38 | ]) | |
39 | if test $gl_cv_have_include_next = yes; then | |
40 | ||
41 | dnl FIXME: Remove HAVE_INCLUDE_NEXT and update everything that uses it | |
42 | dnl to use @INCLUDE_NEXT@ instead. | |
43 | AC_DEFINE([HAVE_INCLUDE_NEXT], 1, | |
44 | [Define if your compiler supports the #include_next directive.]) | |
45 | ||
46 | INCLUDE_NEXT=include_next | |
47 | else | |
48 | INCLUDE_NEXT=include | |
49 | fi | |
50 | AC_SUBST([INCLUDE_NEXT]) | |
51 | ]) | |
52 | ||
53 | # gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...) | |
54 | # ------------------------------------------ | |
55 | # For each arg foo.h, if #include_next works, define NEXT_FOO_H to be | |
56 | # '<foo.h>'; otherwise define it to be | |
57 | # '"///usr/include/foo.h"', or whatever other absolute file name is suitable. | |
58 | # That way, a header file with the following line: | |
59 | # #@INCLUDE_NEXT@ @NEXT_FOO_H@ | |
60 | # behaves (after sed substitution) as if it contained | |
61 | # #include_next <foo.h> | |
62 | # even if the compiler does not support include_next. | |
63 | # The three "///" are to pacify Sun C 5.8, which otherwise would say | |
64 | # "warning: #include of /usr/include/... may be non-portable". | |
65 | # Use `""', not `<>', so that the /// cannot be confused with a C99 comment. | |
66 | AC_DEFUN([gl_CHECK_NEXT_HEADERS], | |
67 | [ | |
68 | AC_REQUIRE([gl_INCLUDE_NEXT]) | |
69 | AC_CHECK_HEADERS_ONCE([$1]) | |
70 | ||
71 | AC_FOREACH([gl_HEADER_NAME], [$1], | |
72 | [AS_VAR_PUSHDEF([gl_next_header], | |
73 | [gl_cv_next_]m4_quote(m4_defn([gl_HEADER_NAME]))) | |
74 | if test $gl_cv_have_include_next = yes; then | |
75 | AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) | |
76 | else | |
77 | AC_CACHE_CHECK( | |
78 | [absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>], | |
79 | m4_quote(m4_defn([gl_next_header])), | |
80 | [AS_VAR_PUSHDEF([gl_header_exists], | |
81 | [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME]))) | |
82 | if test AS_VAR_GET(gl_header_exists) = yes; then | |
83 | AC_LANG_CONFTEST( | |
84 | [AC_LANG_SOURCE( | |
85 | [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]] | |
86 | )]) | |
87 | dnl eval is necessary to expand ac_cpp. | |
88 | dnl Ultrix and Pyramid sh refuse to redirect output of eval, | |
89 | dnl so use subshell. | |
90 | AS_VAR_SET([gl_next_header], | |
91 | ['"'`(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | | |
92 | sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{ | |
93 | s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1# | |
94 | s#^/[^/]#//&# | |
95 | p | |
96 | q | |
97 | }'`'"']) | |
98 | else | |
99 | AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) | |
100 | fi | |
101 | AS_VAR_POPDEF([gl_header_exists])]) | |
102 | fi | |
103 | AC_SUBST( | |
104 | AS_TR_CPP([NEXT_]m4_quote(m4_defn([gl_HEADER_NAME]))), | |
105 | [AS_VAR_GET([gl_next_header])]) | |
106 | AS_VAR_POPDEF([gl_next_header])]) | |
107 | ]) |