| # absolute-header.m4 serial 6 |
| dnl Copyright (C) 2006 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. |
| |
| dnl From Derek Price. |
| |
| # gl_ABSOLUTE_HEADER(HEADER1 HEADER2 ...) |
| # --------------------------------------- |
| # Find the absolute name of a header file, assuming the header exists. |
| # If the header were sys/inttypes.h, this macro would define |
| # ABSOLUTE_SYS_INTTYPES_H to the `""' quoted absolute name of sys/inttypes.h |
| # in config.h |
| # (e.g. `#define ABSOLUTE_SYS_INTTYPES_H "///usr/include/sys/inttypes.h"'). |
| # The three "///" are to pacify Sun C 5.8, which otherwise would say |
| # "warning: #include of /usr/include/... may be non-portable". |
| # Use `""', not `<>', so that the /// cannot be confused with a C99 comment. |
| AC_DEFUN([gl_ABSOLUTE_HEADER], |
| [AC_LANG_PREPROC_REQUIRE()dnl |
| AC_FOREACH([gl_HEADER_NAME], [$1], |
| [AS_VAR_PUSHDEF([gl_absolute_header], |
| [gl_cv_absolute_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl |
| AC_CACHE_CHECK([absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>], |
| m4_quote(m4_defn([gl_absolute_header])), |
| [AS_VAR_PUSHDEF([ac_header_exists], |
| [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl |
| AC_CHECK_HEADERS_ONCE(m4_quote(m4_defn([gl_HEADER_NAME])))dnl |
| if test AS_VAR_GET(ac_header_exists) = yes; then |
| AC_LANG_CONFTEST([AC_LANG_SOURCE([[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]])]) |
| dnl eval is necessary to expand ac_cpp. |
| dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell. |
| AS_VAR_SET(gl_absolute_header, |
| [`(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | |
| sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1#;s#^/[^/]#//&#;p;q;}'`]) |
| fi |
| AS_VAR_POPDEF([ac_header_exists])dnl |
| ])dnl |
| AC_DEFINE_UNQUOTED(AS_TR_CPP([ABSOLUTE_]m4_quote(m4_defn([gl_HEADER_NAME]))), |
| ["AS_VAR_GET(gl_absolute_header)"], |
| [Define this to an absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>.]) |
| AS_VAR_POPDEF([gl_absolute_header])dnl |
| ])dnl |
| ])# gl_ABSOLUTE_HEADER |
