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author | Simon Josefsson <simon@josefsson.org> | 2008-12-01 21:55:02 +0100 |
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committer | Simon Josefsson <simon@josefsson.org> | 2008-12-01 21:55:02 +0100 |
commit | 1fd55e6c31382dcb274db911f62d14215bfec135 (patch) | |
tree | 0974c1dfc3eac05ca161d366e434b196a4c2e0b8 /gl/m4/include_next.m4 | |
parent | 941e2538bd2b75475f74f48904e3a7b18a219306 (diff) | |
download | gnutls-1fd55e6c31382dcb274db911f62d14215bfec135.tar.gz |
Update gnulib files.
Diffstat (limited to 'gl/m4/include_next.m4')
-rw-r--r-- | gl/m4/include_next.m4 | 52 |
1 files changed, 41 insertions, 11 deletions
diff --git a/gl/m4/include_next.m4 b/gl/m4/include_next.m4 index c70c4133a0..062753c588 100644 --- a/gl/m4/include_next.m4 +++ b/gl/m4/include_next.m4 @@ -1,4 +1,4 @@ -# include_next.m4 serial 9 +# include_next.m4 serial 10 dnl Copyright (C) 2006-2008 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -11,6 +11,10 @@ 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 @@ -26,12 +30,26 @@ 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 + [rm -rf conftestd1a conftestd1b conftestd2 + mkdir conftestd1a conftestd1b conftestd2 dnl The include of <stdio.h> is because IBM C 9.0 on AIX 6.1 supports dnl include_next when used as first preprocessor directive in a file, - dnl but not when preceded by another include directive. - cat <<EOF > conftestd1/conftest.h + dnl but not when preceded by another include directive. Additionally, + dnl with this same compiler, include_next is a no-op when used in a + dnl header file that was included by specifying its absolute file name. + dnl Despite these two bugs, include_next is used in the compiler's + dnl <math.h>. By virtue of the second bug, we need to use include_next + dnl 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> @@ -47,24 +65,36 @@ EOF #endif #define DEFINED_IN_CONFTESTD2 EOF - save_CPPFLAGS="$CPPFLAGS" - CPPFLAGS="$CPPFLAGS -Iconftestd1 -Iconftestd2" + gl_save_CPPFLAGS="$CPPFLAGS" + CPPFLAGS="$gl_save_CPPFLAGS -Iconftestd1b -Iconftestd2" AC_COMPILE_IFELSE([#include <conftest.h>], [gl_cv_have_include_next=yes], - [gl_cv_have_include_next=no]) - CPPFLAGS="$save_CPPFLAGS" - rm -rf conftestd1 conftestd2 + [CPPFLAGS="$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 - INCLUDE_NEXT=include + 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]) ]) |