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102 lines
4.2 KiB
102 lines
4.2 KiB
# absolute-header.m4 serial 16 |
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dnl Copyright (C) 2006-2017 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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dnl From Derek Price. |
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# gl_ABSOLUTE_HEADER(HEADER1 HEADER2 ...) |
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# --------------------------------------- |
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# Find the absolute name of a header file, testing first if the header exists. |
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# If the header were sys/inttypes.h, this macro would define |
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# ABSOLUTE_SYS_INTTYPES_H to the '""' quoted absolute name of sys/inttypes.h |
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# in config.h |
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# (e.g. '#define ABSOLUTE_SYS_INTTYPES_H "///usr/include/sys/inttypes.h"'). |
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# The three "///" are to pacify Sun C 5.8, which otherwise would say |
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# "warning: #include of /usr/include/... may be non-portable". |
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# Use '""', not '<>', so that the /// cannot be confused with a C99 comment. |
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# Note: This macro assumes that the header file is not empty after |
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# preprocessing, i.e. it does not only define preprocessor macros but also |
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# provides some type/enum definitions or function/variable declarations. |
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AC_DEFUN([gl_ABSOLUTE_HEADER], |
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[AC_REQUIRE([AC_CANONICAL_HOST]) |
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AC_LANG_PREPROC_REQUIRE()dnl |
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dnl FIXME: gl_absolute_header and ac_header_exists must be used unquoted |
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dnl until we can assume autoconf 2.64 or newer. |
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m4_foreach_w([gl_HEADER_NAME], [$1], |
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[AS_VAR_PUSHDEF([gl_absolute_header], |
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[gl_cv_absolute_]m4_defn([gl_HEADER_NAME]))dnl |
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AC_CACHE_CHECK([absolute name of <]m4_defn([gl_HEADER_NAME])[>], |
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m4_defn([gl_absolute_header]), |
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[AS_VAR_PUSHDEF([ac_header_exists], |
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[ac_cv_header_]m4_defn([gl_HEADER_NAME]))dnl |
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AC_CHECK_HEADERS_ONCE(m4_defn([gl_HEADER_NAME]))dnl |
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if test AS_VAR_GET(ac_header_exists) = yes; then |
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gl_ABSOLUTE_HEADER_ONE(m4_defn([gl_HEADER_NAME])) |
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fi |
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AS_VAR_POPDEF([ac_header_exists])dnl |
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])dnl |
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AC_DEFINE_UNQUOTED(AS_TR_CPP([ABSOLUTE_]m4_defn([gl_HEADER_NAME])), |
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["AS_VAR_GET(gl_absolute_header)"], |
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[Define this to an absolute name of <]m4_defn([gl_HEADER_NAME])[>.]) |
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AS_VAR_POPDEF([gl_absolute_header])dnl |
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])dnl |
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])# gl_ABSOLUTE_HEADER |
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# gl_ABSOLUTE_HEADER_ONE(HEADER) |
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# ------------------------------ |
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# Like gl_ABSOLUTE_HEADER, except that: |
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# - it assumes that the header exists, |
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# - it uses the current CPPFLAGS, |
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# - it does not cache the result, |
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# - it is silent. |
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AC_DEFUN([gl_ABSOLUTE_HEADER_ONE], |
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[ |
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AC_REQUIRE([AC_CANONICAL_HOST]) |
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AC_LANG_CONFTEST([AC_LANG_SOURCE([[#include <]]m4_dquote([$1])[[>]])]) |
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dnl AIX "xlc -E" and "cc -E" omit #line directives for header files |
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dnl that contain only a #include of other header files and no |
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dnl non-comment tokens of their own. This leads to a failure to |
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dnl detect the absolute name of <dirent.h>, <signal.h>, <poll.h> |
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dnl and others. The workaround is to force preservation of comments |
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dnl through option -C. This ensures all necessary #line directives |
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dnl are present. GCC supports option -C as well. |
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case "$host_os" in |
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aix*) gl_absname_cpp="$ac_cpp -C" ;; |
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*) gl_absname_cpp="$ac_cpp" ;; |
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esac |
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changequote(,) |
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case "$host_os" in |
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mingw*) |
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dnl For the sake of native Windows compilers (excluding gcc), |
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dnl treat backslash as a directory separator, like /. |
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dnl Actually, these compilers use a double-backslash as |
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dnl directory separator, inside the |
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dnl # line "filename" |
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dnl directives. |
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gl_dirsep_regex='[/\\]' |
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;; |
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*) |
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gl_dirsep_regex='\/' |
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;; |
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esac |
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dnl A sed expression that turns a string into a basic regular |
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dnl expression, for use within "/.../". |
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gl_make_literal_regex_sed='s,[]$^\\.*/[],\\&,g' |
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gl_header_literal_regex=`echo '$1' \ |
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| sed -e "$gl_make_literal_regex_sed"` |
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gl_absolute_header_sed="/${gl_dirsep_regex}${gl_header_literal_regex}/"'{ |
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s/.*"\(.*'"${gl_dirsep_regex}${gl_header_literal_regex}"'\)".*/\1/ |
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s|^/[^/]|//&| |
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p |
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q |
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}' |
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changequote([,]) |
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dnl eval is necessary to expand gl_absname_cpp. |
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dnl Ultrix and Pyramid sh refuse to redirect output of eval, |
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dnl so use subshell. |
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AS_VAR_SET([gl_cv_absolute_]AS_TR_SH([[$1]]), |
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[`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | |
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sed -n "$gl_absolute_header_sed"`]) |
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])
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