# include_next.m4 serial 4 dnl Copyright (C) 2006, 2007, 2009 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 Paul Eggert and Derek Price. AC_DEFUN([gl_INCLUDE_NEXT], [ AC_LANG_PREPROC_REQUIRE() AC_CACHE_CHECK([whether the preprocessor supports include_next], [gl_cv_have_include_next], [rm -rf conftestd1 conftestd2 mkdir conftestd1 conftestd2 cat <<EOF > conftestd1/conftest.h #define DEFINED_IN_CONFTESTD1 #include_next <conftest.h> #ifdef DEFINED_IN_CONFTESTD2 int foo; #else #error "include_next doesn't work" #endif EOF cat <<EOF > conftestd2/conftest.h #ifndef DEFINED_IN_CONFTESTD1 #error "include_next test doesn't work" #endif #define DEFINED_IN_CONFTESTD2 EOF save_CPPFLAGS="$CPPFLAGS" CPPFLAGS="$CPPFLAGS -Iconftestd1 -Iconftestd2" AC_COMPILE_IFELSE([#include <conftest.h>], [gl_cv_have_include_next=yes], [gl_cv_have_include_next=no]) CPPFLAGS="$save_CPPFLAGS" rm -rf conftestd1 conftestd2 ]) if test $gl_cv_have_include_next = yes; then dnl FIXME: Remove HAVE_INCLUDE_NEXT and update everything that uses it dnl to use @INCLUDE_NEXT@ instead. AC_DEFINE([HAVE_INCLUDE_NEXT], 1, [Define if your compiler supports the #include_next directive.]) INCLUDE_NEXT=include_next else INCLUDE_NEXT=include fi AC_SUBST([INCLUDE_NEXT]) ]) # gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...) # ------------------------------------------ # For each arg foo.h, if #include_next works, define NEXT_FOO_H to be # '<foo.h>'; otherwise define it to be # '"///usr/include/foo.h"', or whatever other absolute file name is suitable. # That way, a header file with the following line: # #@INCLUDE_NEXT@ @NEXT_FOO_H@ # behaves (after sed substitution) as if it contained # #include_next <foo.h> # even if the compiler does not support include_next. # 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_CHECK_NEXT_HEADERS], [ AC_REQUIRE([gl_INCLUDE_NEXT]) AC_CHECK_HEADERS_ONCE([$1]) AC_FOREACH([gl_HEADER_NAME], [$1], [AS_VAR_PUSHDEF([gl_next_header], [gl_cv_next_]m4_quote(m4_defn([gl_HEADER_NAME]))) if test $gl_cv_have_include_next = yes; then AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) else AC_CACHE_CHECK( [absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>], m4_quote(m4_defn([gl_next_header])), [AS_VAR_PUSHDEF([gl_header_exists], [ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME]))) if test AS_VAR_GET(gl_header_exists) = yes; then AC_LANG_CONFTEST( [AC_LANG_SOURCE( [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]] )]) dnl eval is necessary to expand ac_cpp. dnl Ultrix and Pyramid sh refuse to redirect output of eval, dnl so use subshell. AS_VAR_SET([gl_next_header], ['"'`(eval "$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 }'`'"']) else AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) fi AS_VAR_POPDEF([gl_header_exists])]) fi AC_SUBST( AS_TR_CPP([NEXT_]m4_quote(m4_defn([gl_HEADER_NAME]))), [AS_VAR_GET([gl_next_header])]) AS_VAR_POPDEF([gl_next_header])]) ])