1# absolute-header.m4 serial 7 2dnl Copyright (C) 2006, 2007 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7dnl From Derek Price. 8 9# gl_ABSOLUTE_HEADER(HEADER1 HEADER2 ...) 10# --------------------------------------- 11# Find the absolute name of a header file, assuming 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. 19AC_DEFUN([gl_ABSOLUTE_HEADER], 20[AC_LANG_PREPROC_REQUIRE()dnl 21AC_FOREACH([gl_HEADER_NAME], [$1], 22 [AS_VAR_PUSHDEF([gl_absolute_header], 23 [gl_cv_absolute_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl 24 AC_CACHE_CHECK([absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>], 25 m4_quote(m4_defn([gl_absolute_header])), 26 [AS_VAR_PUSHDEF([ac_header_exists], 27 [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME])))dnl 28 AC_CHECK_HEADERS_ONCE(m4_quote(m4_defn([gl_HEADER_NAME])))dnl 29 if test AS_VAR_GET(ac_header_exists) = yes; then 30 AC_LANG_CONFTEST([AC_LANG_SOURCE([[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]])]) 31dnl eval is necessary to expand ac_cpp. 32dnl Ultrix and Pyramid sh refuse to redirect output of eval, so use subshell. 33 AS_VAR_SET(gl_absolute_header, 34[`(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | 35sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{ 36 s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1# 37 s#^/[^/]#//&# 38 p 39 q 40}'`]) 41 fi 42 AS_VAR_POPDEF([ac_header_exists])dnl 43 ])dnl 44 AC_DEFINE_UNQUOTED(AS_TR_CPP([ABSOLUTE_]m4_quote(m4_defn([gl_HEADER_NAME]))), 45 ["AS_VAR_GET(gl_absolute_header)"], 46 [Define this to an absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>.]) 47 AS_VAR_POPDEF([gl_absolute_header])dnl 48])dnl 49])# gl_ABSOLUTE_HEADER 50