mirror of
https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
synced 2024-12-12 03:13:52 +08:00
136 lines
4.9 KiB
Plaintext
136 lines
4.9 KiB
Plaintext
# from http://autoconf-archive.cryp.to/ax_tls.html
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#
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# This was licensed under the GPL with the following exception:
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#
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# As a special exception, the respective Autoconf Macro's copyright
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# owner gives unlimited permission to copy, distribute and modify the
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# configure scripts that are the output of Autoconf when processing
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# the Macro. You need not follow the terms of the GNU General Public
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# License when using or distributing such scripts, even though
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# portions of the text of the Macro appear in them. The GNU General
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# Public License (GPL) does govern all other use of the material that
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# constitutes the Autoconf Macro.
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#
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# This special exception to the GPL applies to versions of the
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# Autoconf Macro released by the Autoconf Macro Archive. When you make
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# and distribute a modified version of the Autoconf Macro, you may
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# extend this special exception to the GPL to apply to your modified
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# version as well.
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#
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AC_DEFUN([AX_TLS], [
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AC_MSG_CHECKING(for thread local storage (TLS) class)
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AC_CACHE_VAL(ac_cv_tls, [
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ax_tls_keywords="__thread __declspec(thread) none"
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for ax_tls_keyword in $ax_tls_keywords; do
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case $ax_tls_keyword in
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none) ac_cv_tls=none ; break ;;
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*)
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AC_TRY_COMPILE(
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[#include <stdlib.h>
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static void
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foo(void) {
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static ] $ax_tls_keyword [ int bar;
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exit(1);
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}],
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[],
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[ac_cv_tls=$ax_tls_keyword ; break],
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ac_cv_tls=none
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)
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esac
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done
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])
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if test "$ac_cv_tls" != "none"; then
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dnl AC_DEFINE([TLS], [], [If the compiler supports a TLS storage class define it to that here])
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AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
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fi
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AC_MSG_RESULT($ac_cv_tls)
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])
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# ===========================================================================
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# http://www.nongnu.org/autoconf-archive/check_gnu_make.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# CHECK_GNU_MAKE()
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#
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# DESCRIPTION
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#
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# This macro searches for a GNU version of make. If a match is found, the
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# makefile variable `ifGNUmake' is set to the empty string, otherwise it
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# is set to "#". This is useful for including a special features in a
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# Makefile, which cannot be handled by other versions of make. The
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# variable _cv_gnu_make_command is set to the command to invoke GNU make
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# if it exists, the empty string otherwise.
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#
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# Here is an example of its use:
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#
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# Makefile.in might contain:
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#
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# # A failsafe way of putting a dependency rule into a makefile
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# $(DEPEND):
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# $(CC) -MM $(srcdir)/*.c > $(DEPEND)
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#
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# @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
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# @ifGNUmake@ include $(DEPEND)
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# @ifGNUmake@ endif
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#
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# Then configure.in would normally contain:
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#
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# CHECK_GNU_MAKE()
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# AC_OUTPUT(Makefile)
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#
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# Then perhaps to cause gnu make to override any other make, we could do
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# something like this (note that GNU make always looks for GNUmakefile
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# first):
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#
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# if ! test x$_cv_gnu_make_command = x ; then
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# mv Makefile GNUmakefile
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# echo .DEFAULT: > Makefile ;
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# echo \ $_cv_gnu_make_command \$@ >> Makefile;
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# fi
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#
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# Then, if any (well almost any) other make is called, and GNU make also
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# exists, then the other make wraps the GNU make.
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#
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# LICENSE
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#
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# Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved.
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#
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# Note: Modified by Ted Ts'o to add @ifNotGNUMake@
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AC_DEFUN(
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[CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
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_cv_gnu_make_command='' ;
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dnl Search all the common names for GNU make
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if test -n "$FORCE_NATIVE_MAKE" ; then
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MAKES="make"
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else
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MAKES="make gmake gnumake"
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fi
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for a in "$MAKE" $MAKES ; do
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if test -z "$a" ; then continue ; fi ;
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if ( sh -c "$a --version" 2> /dev/null | grep GNU 2>&1 > /dev/null ) ; then
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_cv_gnu_make_command=$a ;
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break;
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fi
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done ;
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) ;
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dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
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if test "x$_cv_gnu_make_command" != "x" ; then
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ifGNUmake='' ;
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ifNotGNUmake='#' ;
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else
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ifGNUmake='#' ;
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ifNotGNUmake='' ;
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AC_MSG_RESULT("Not found");
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fi
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AC_SUBST(ifGNUmake)
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AC_SUBST(ifNotGNUmake)
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] )
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