diff options
Diffstat (limited to 'm4/include_next.m4')
| -rw-r--r-- | m4/include_next.m4 | 187 |
1 files changed, 0 insertions, 187 deletions
diff --git a/m4/include_next.m4 b/m4/include_next.m4 deleted file mode 100644 index c7e0672..0000000 --- a/m4/include_next.m4 +++ /dev/null @@ -1,187 +0,0 @@ -# include_next.m4 serial 14 -dnl Copyright (C) 2006-2010 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. - -dnl Sets INCLUDE_NEXT and PRAGMA_SYSTEM_HEADER. -dnl -dnl INCLUDE_NEXT expands to 'include_next' if the compiler supports it, or to -dnl 'include' otherwise. -dnl -dnl INCLUDE_NEXT_AS_FIRST_DIRECTIVE expands to 'include_next' if the compiler -dnl supports it in the special case that it is the first include directive in -dnl the given file, or to 'include' otherwise. -dnl -dnl PRAGMA_SYSTEM_HEADER can be used in files that contain #include_next, -dnl so as to avoid GCC warnings when the gcc option -pedantic is used. -dnl '#pragma GCC system_header' has the same effect as if the file was found -dnl through the include search path specified with '-isystem' options (as -dnl opposed to the search path specified with '-I' options). Namely, gcc -dnl does not warn about some things, and on some systems (Solaris and Interix) -dnl __STDC__ evaluates to 0 instead of to 1. The latter is an undesired side -dnl effect; we are therefore careful to use 'defined __STDC__' or '1' instead -dnl of plain '__STDC__'. - -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 conftestd1a conftestd1b conftestd2 - mkdir conftestd1a conftestd1b conftestd2 - dnl IBM C 9.0, 10.1 (original versions, prior to the 2009-01 updates) on - dnl AIX 6.1 support include_next when used as first preprocessor directive - dnl in a file, but not when preceded by another include directive. Check - dnl for this bug by including <stdio.h>. - dnl Additionally, with this same compiler, include_next is a no-op when - dnl used in a header file that was included by specifying its absolute - dnl file name. Despite these two bugs, include_next is used in the - dnl compiler's <math.h>. By virtue of the second bug, we need to use - dnl include_next as well in this case. - cat <<EOF > conftestd1a/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 > conftestd1b/conftest.h -#define DEFINED_IN_CONFTESTD1 -#include <stdio.h> -#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 - gl_save_CPPFLAGS="$CPPFLAGS" - CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1b -Iconftestd2" - AC_COMPILE_IFELSE([#include <conftest.h>], - [gl_cv_have_include_next=yes], - [CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1a -Iconftestd2" - AC_COMPILE_IFELSE([#include <conftest.h>], - [gl_cv_have_include_next=buggy], - [gl_cv_have_include_next=no]) - ]) - CPPFLAGS="$gl_save_CPPFLAGS" - rm -rf conftestd1a conftestd1b conftestd2 - ]) - PRAGMA_SYSTEM_HEADER= - if test $gl_cv_have_include_next = yes; then - INCLUDE_NEXT=include_next - INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include_next - if test -n "$GCC"; then - PRAGMA_SYSTEM_HEADER='#pragma GCC system_header' - fi - else - if test $gl_cv_have_include_next = buggy; then - INCLUDE_NEXT=include - INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include_next - else - INCLUDE_NEXT=include - INCLUDE_NEXT_AS_FIRST_DIRECTIVE=include - fi - fi - AC_SUBST([INCLUDE_NEXT]) - AC_SUBST([INCLUDE_NEXT_AS_FIRST_DIRECTIVE]) - AC_SUBST([PRAGMA_SYSTEM_HEADER]) -]) - -# 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. -# Also, if #include_next works as first preprocessing directive in a file, -# define NEXT_AS_FIRST_DIRECTIVE_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@ -# or -# #@INCLUDE_NEXT_AS_FIRST_DIRECTIVE@ @NEXT_AS_FIRST_DIRECTIVE_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. -# Note: This macro assumes that the header file is not empty after -# preprocessing, i.e. it does not only define preprocessor macros but also -# provides some type/enum definitions or function/variable declarations. -AC_DEFUN([gl_CHECK_NEXT_HEADERS], -[ - AC_REQUIRE([gl_INCLUDE_NEXT]) - AC_REQUIRE([AC_CANONICAL_HOST]) - AC_CHECK_HEADERS_ONCE([$1]) - - m4_foreach_w([gl_HEADER_NAME], [$1], - [AS_VAR_PUSHDEF([gl_next_header], - [gl_cv_next_]m4_defn([gl_HEADER_NAME])) - if test $gl_cv_have_include_next = yes; then - AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>']) - else - AC_CACHE_CHECK( - [absolute name of <]m4_defn([gl_HEADER_NAME])[>], - m4_defn([gl_next_header]), - [AS_VAR_PUSHDEF([gl_header_exists], - [ac_cv_header_]m4_defn([gl_HEADER_NAME])) - if test AS_VAR_GET(gl_header_exists) = yes; then - AC_LANG_CONFTEST( - [AC_LANG_SOURCE( - [[#include <]]m4_dquote(m4_defn([gl_HEADER_NAME]))[[>]] - )]) - dnl AIX "xlc -E" and "cc -E" omit #line directives for header files - dnl that contain only a #include of other header files and no - dnl non-comment tokens of their own. This leads to a failure to - dnl detect the absolute name of <dirent.h>, <signal.h>, <poll.h> - dnl and others. The workaround is to force preservation of comments - dnl through option -C. This ensures all necessary #line directives - dnl are present. GCC supports option -C as well. - case "$host_os" in - aix*) gl_absname_cpp="$ac_cpp -C" ;; - *) gl_absname_cpp="$ac_cpp" ;; - esac - dnl eval is necessary to expand gl_absname_cpp. - dnl Ultrix and Pyramid sh refuse to redirect output of eval, - dnl so use subshell. - AS_VAR_SET([gl_next_header], - ['"'`(eval "$gl_absname_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD | - sed -n '\#/]m4_defn([gl_HEADER_NAME])[#{ - s#.*"\(.*/]m4_defn([gl_HEADER_NAME])[\)".*#\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_defn([gl_HEADER_NAME])), - [AS_VAR_GET([gl_next_header])]) - if test $gl_cv_have_include_next = yes || test $gl_cv_have_include_next = buggy; then - # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include_next' - gl_next_as_first_directive='<'gl_HEADER_NAME'>' - else - # INCLUDE_NEXT_AS_FIRST_DIRECTIVE='include' - gl_next_as_first_directive=AS_VAR_GET([gl_next_header]) - fi - AC_SUBST( - AS_TR_CPP([NEXT_AS_FIRST_DIRECTIVE_]m4_defn([gl_HEADER_NAME])), - [$gl_next_as_first_directive]) - AS_VAR_POPDEF([gl_next_header])]) -]) |