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815.1.1
by Monty Taylor
Add timegm which is missing on Solaris. |
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# include_next.m4 serial 6 |
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dnl Copyright (C) 2006-2008 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 Paul Eggert and Derek Price. |
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AC_DEFUN([gl_INCLUDE_NEXT], |
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[
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AC_LANG_PREPROC_REQUIRE()
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AC_CACHE_CHECK([whether the preprocessor supports include_next], |
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[gl_cv_have_include_next], |
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[rm -rf conftestd1 conftestd2 |
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mkdir conftestd1 conftestd2
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cat <<EOF > conftestd1/conftest.h
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#define DEFINED_IN_CONFTESTD1
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#include_next <conftest.h>
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#ifdef DEFINED_IN_CONFTESTD2
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int foo;
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#else
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#error "include_next doesn't work"
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#endif
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EOF
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cat <<EOF > conftestd2/conftest.h
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#ifndef DEFINED_IN_CONFTESTD1
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#error "include_next test doesn't work"
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#endif
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#define DEFINED_IN_CONFTESTD2
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EOF
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save_CPPFLAGS="$CPPFLAGS"
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CPPFLAGS="$CPPFLAGS -Iconftestd1 -Iconftestd2"
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AC_COMPILE_IFELSE([#include <conftest.h>], |
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[gl_cv_have_include_next=yes], |
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[gl_cv_have_include_next=no]) |
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CPPFLAGS="$save_CPPFLAGS" |
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rm -rf conftestd1 conftestd2 |
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]) |
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if test $gl_cv_have_include_next = yes; then |
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dnl FIXME: Remove HAVE_INCLUDE_NEXT and update everything that uses it |
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dnl to use @INCLUDE_NEXT@ instead. |
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AC_DEFINE([HAVE_INCLUDE_NEXT], 1, |
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[Define if your compiler supports the #include_next directive.]) |
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INCLUDE_NEXT=include_next |
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else |
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INCLUDE_NEXT=include |
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fi |
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AC_SUBST([INCLUDE_NEXT]) |
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]) |
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# gl_CHECK_NEXT_HEADERS(HEADER1 HEADER2 ...) |
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# ------------------------------------------ |
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# For each arg foo.h, if #include_next works, define NEXT_FOO_H to be |
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# '<foo.h>'; otherwise define it to be |
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# '"///usr/include/foo.h"', or whatever other absolute file name is suitable. |
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# That way, a header file with the following line: |
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# #@INCLUDE_NEXT@ @NEXT_FOO_H@ |
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# behaves (after sed substitution) as if it contained |
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# #include_next <foo.h> |
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# even if the compiler does not support include_next. |
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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_CHECK_NEXT_HEADERS], |
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[
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AC_REQUIRE([gl_INCLUDE_NEXT]) |
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AC_CHECK_HEADERS_ONCE([$1]) |
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m4_foreach_w([gl_HEADER_NAME], [$1], |
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[AS_VAR_PUSHDEF([gl_next_header], |
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[gl_cv_next_]m4_quote(m4_defn([gl_HEADER_NAME]))) |
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if test $gl_cv_have_include_next = yes; then |
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AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) |
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else |
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AC_CACHE_CHECK( |
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[absolute name of <]m4_quote(m4_defn([gl_HEADER_NAME]))[>], |
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m4_quote(m4_defn([gl_next_header])), |
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[AS_VAR_PUSHDEF([gl_header_exists], |
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[ac_cv_header_]m4_quote(m4_defn([gl_HEADER_NAME]))) |
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if test AS_VAR_GET(gl_header_exists) = yes; then |
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AC_LANG_CONFTEST( |
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[AC_LANG_SOURCE( |
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[[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]] |
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)]) |
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dnl eval is necessary to expand ac_cpp. |
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dnl Ultrix and Pyramid sh refuse to redirect output of eval, |
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dnl so use subshell. |
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AS_VAR_SET([gl_next_header], |
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['"'`(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | |
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sed -n '\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{ |
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s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1# |
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s#^/[^/]#//&# |
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p |
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q |
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}'`'"']) |
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else
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AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) |
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fi |
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AS_VAR_POPDEF([gl_header_exists])]) |
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fi |
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AC_SUBST( |
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AS_TR_CPP([NEXT_]m4_quote(m4_defn([gl_HEADER_NAME]))), |
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[AS_VAR_GET([gl_next_header])]) |
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AS_VAR_POPDEF([gl_next_header])]) |
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]) |