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4a626d0a | 1 | # absolute-header.m4 serial 16 |
49e4877c | 2 | dnl Copyright (C) 2006-2016 Free Software Foundation, Inc. |
4a626d0a PA |
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 Derek Price. | |
8 | ||
9 | # gl_ABSOLUTE_HEADER(HEADER1 HEADER2 ...) | |
10 | # --------------------------------------- | |
11 | # Find the absolute name of a header file, testing first if the header exists. | |
12 | # If the header were sys/inttypes.h, this macro would define | |
13 | # ABSOLUTE_SYS_INTTYPES_H to the '""' quoted absolute name of sys/inttypes.h | |
14 | # in config.h | |
15 | # (e.g. '#define ABSOLUTE_SYS_INTTYPES_H "///usr/include/sys/inttypes.h"'). | |
16 | # The three "///" are to pacify Sun C 5.8, which otherwise would say | |
17 | # "warning: #include of /usr/include/... may be non-portable". | |
18 | # Use '""', not '<>', so that the /// cannot be confused with a C99 comment. | |
19 | # Note: This macro assumes that the header file is not empty after | |
20 | # preprocessing, i.e. it does not only define preprocessor macros but also | |
21 | # provides some type/enum definitions or function/variable declarations. | |
22 | AC_DEFUN([gl_ABSOLUTE_HEADER], | |
23 | [AC_REQUIRE([AC_CANONICAL_HOST]) | |
24 | AC_LANG_PREPROC_REQUIRE()dnl | |
25 | dnl FIXME: gl_absolute_header and ac_header_exists must be used unquoted | |
26 | dnl until we can assume autoconf 2.64 or newer. | |
27 | m4_foreach_w([gl_HEADER_NAME], [$1], | |
28 | [AS_VAR_PUSHDEF([gl_absolute_header], | |
29 | [gl_cv_absolute_]m4_defn([gl_HEADER_NAME]))dnl | |
30 | AC_CACHE_CHECK([absolute name of <]m4_defn([gl_HEADER_NAME])[>], | |
31 | m4_defn([gl_absolute_header]), | |
32 | [AS_VAR_PUSHDEF([ac_header_exists], | |
33 | [ac_cv_header_]m4_defn([gl_HEADER_NAME]))dnl | |
34 | AC_CHECK_HEADERS_ONCE(m4_defn([gl_HEADER_NAME]))dnl | |
35 | if test AS_VAR_GET(ac_header_exists) = yes; then | |
36 | gl_ABSOLUTE_HEADER_ONE(m4_defn([gl_HEADER_NAME])) | |
37 | fi | |
38 | AS_VAR_POPDEF([ac_header_exists])dnl | |
39 | ])dnl | |
40 | AC_DEFINE_UNQUOTED(AS_TR_CPP([ABSOLUTE_]m4_defn([gl_HEADER_NAME])), | |
41 | ["AS_VAR_GET(gl_absolute_header)"], | |
42 | [Define this to an absolute name of <]m4_defn([gl_HEADER_NAME])[>.]) | |
43 | AS_VAR_POPDEF([gl_absolute_header])dnl | |
44 | ])dnl | |
45 | ])# gl_ABSOLUTE_HEADER | |
46 | ||
47 | # gl_ABSOLUTE_HEADER_ONE(HEADER) | |
48 | # ------------------------------ | |
49 | # Like gl_ABSOLUTE_HEADER, except that: | |
50 | # - it assumes that the header exists, | |
51 | # - it uses the current CPPFLAGS, | |
52 | # - it does not cache the result, | |
53 | # - it is silent. | |
54 | AC_DEFUN([gl_ABSOLUTE_HEADER_ONE], | |
55 | [ | |
56 | AC_REQUIRE([AC_CANONICAL_HOST]) | |
57 | AC_LANG_CONFTEST([AC_LANG_SOURCE([[#include <]]m4_dquote([$1])[[>]])]) | |
58 | dnl AIX "xlc -E" and "cc -E" omit #line directives for header files | |
59 | dnl that contain only a #include of other header files and no | |
60 | dnl non-comment tokens of their own. This leads to a failure to | |
61 | dnl detect the absolute name of <dirent.h>, <signal.h>, <poll.h> | |
62 | dnl and others. The workaround is to force preservation of comments | |
63 | dnl through option -C. This ensures all necessary #line directives | |
64 | dnl are present. GCC supports option -C as well. | |
65 | case "$host_os" in | |
66 | aix*) gl_absname_cpp="$ac_cpp -C" ;; | |
67 | *) gl_absname_cpp="$ac_cpp" ;; | |
68 | esac | |
69 | changequote(,) | |
70 | case "$host_os" in | |
71 | mingw*) | |
72 | dnl For the sake of native Windows compilers (excluding gcc), | |
73 | dnl treat backslash as a directory separator, like /. | |
74 | dnl Actually, these compilers use a double-backslash as | |
75 | dnl directory separator, inside the | |
76 | dnl # line "filename" | |
77 | dnl directives. | |
78 | gl_dirsep_regex='[/\\]' | |
79 | ;; | |
80 | *) | |
81 | gl_dirsep_regex='\/' | |
82 | ;; | |
83 | esac | |
84 | dnl A sed expression that turns a string into a basic regular | |
85 | dnl expression, for use within "/.../". | |
86 | gl_make_literal_regex_sed='s,[]$^\\.*/[],\\&,g' | |
87 | gl_header_literal_regex=`echo '$1' \ | |
88 | | sed -e "$gl_make_literal_regex_sed"` | |
89 | gl_absolute_header_sed="/${gl_dirsep_regex}${gl_header_literal_regex}/"'{ | |
90 | s/.*"\(.*'"${gl_dirsep_regex}${gl_header_literal_regex}"'\)".*/\1/ | |
91 | s|^/[^/]|//&| | |
92 | p | |
93 | q | |
94 | }' | |
95 | changequote([,]) | |
96 | dnl eval is necessary to expand gl_absname_cpp. | |
97 | dnl Ultrix and Pyramid sh refuse to redirect output of eval, | |
98 | dnl so use subshell. | |
99 | AS_VAR_SET([gl_cv_absolute_]AS_TR_SH([[$1]]), | |
100 | [`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | | |
101 | sed -n "$gl_absolute_header_sed"`]) | |
102 | ]) |