[thirdparty/e2fsprogs.git] / acinclude.m4

# from http://autoconf-archive.cryp.to/ax_tls.html
#
# This was licensed under the GPL with the following exception:
#
# As a special exception, the respective Autoconf Macro's copyright
# owner gives unlimited permission to copy, distribute and modify the
# configure scripts that are the output of Autoconf when processing
# the Macro. You need not follow the terms of the GNU General Public
# License when using or distributing such scripts, even though
# portions of the text of the Macro appear in them. The GNU General
# Public License (GPL) does govern all other use of the material that
# constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the
# Autoconf Macro released by the Autoconf Macro Archive. When you make
# and distribute a modified version of the Autoconf Macro, you may
# extend this special exception to the GPL to apply to your modified
# version as well.
#
AC_DEFUN([AX_TLS], [
  AC_MSG_CHECKING(for thread local storage (TLS) class)
  AC_CACHE_VAL(ac_cv_tls, [
    ax_tls_keywords="__thread __declspec(thread) none"
    for ax_tls_keyword in $ax_tls_keywords; do
       case $ax_tls_keyword in
          none) ac_cv_tls=none ; break ;;
          *)
             AC_TRY_COMPILE(
                [#include <stdlib.h>
                 static void
                 foo(void) {
                 static ] $ax_tls_keyword [ int bar;
                 exit(1);
                 }],
                 [],
                 [ac_cv_tls=$ax_tls_keyword ; break],
                 ac_cv_tls=none
             )
          esac
    done
])

  if test "$ac_cv_tls" != "none"; then
    dnl AC_DEFINE([TLS], [], [If the compiler supports a TLS storage class define it to that here])
    AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
  fi
  AC_MSG_RESULT($ac_cv_tls)
])

# ===========================================================================
#         http://www.nongnu.org/autoconf-archive/check_gnu_make.html
# ===========================================================================
#
# SYNOPSIS
#
#   CHECK_GNU_MAKE()
#
# DESCRIPTION
#
#   This macro searches for a GNU version of make. If a match is found, the
#   makefile variable `ifGNUmake' is set to the empty string, otherwise it
#   is set to "#". This is useful for including a special features in a
#   Makefile, which cannot be handled by other versions of make. The
#   variable _cv_gnu_make_command is set to the command to invoke GNU make
#   if it exists, the empty string otherwise.
#
#   Here is an example of its use:
#
#   Makefile.in might contain:
#
#       # A failsafe way of putting a dependency rule into a makefile
#       $(DEPEND):
#               $(CC) -MM $(srcdir)/*.c > $(DEPEND)
#
#       @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
#       @ifGNUmake@ include $(DEPEND)
#       @ifGNUmake@ endif
#
#   Then configure.in would normally contain:
#
#       CHECK_GNU_MAKE()
#       AC_OUTPUT(Makefile)
#
#   Then perhaps to cause gnu make to override any other make, we could do
#   something like this (note that GNU make always looks for GNUmakefile
#   first):
#
#       if  ! test x$_cv_gnu_make_command = x ; then
#               mv Makefile GNUmakefile
#               echo .DEFAULT: > Makefile ;
#               echo \  $_cv_gnu_make_command \$@ >> Makefile;
#       fi
#
#   Then, if any (well almost any) other make is called, and GNU make also
#   exists, then the other make wraps the GNU make.
#
# LICENSE
#
#   Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
#
#   Copying and distribution of this file, with or without modification, are
#   permitted in any medium without royalty provided the copyright notice
#   and this notice are preserved.
#
# Note: Modified by Ted Ts'o to add @ifNotGNUMake@

AC_DEFUN(
        [CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
                _cv_gnu_make_command='' ;
dnl Search all the common names for GNU make
                if test -n "$FORCE_NATIVE_MAKE" ; then
                   MAKES="make"
                else
                   MAKES="make gmake gnumake"
                fi
                for a in "$MAKE" $MAKES ; do
                        if test -z "$a" ; then continue ; fi ;
                        if  ( sh -c "$a --version" 2> /dev/null | grep GNU  2>&1 > /dev/null ) ;  then
                                _cv_gnu_make_command=$a ;
                                break;
                        fi
                done ;
        ) ;
dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
        if test  "x$_cv_gnu_make_command" != "x"  ; then
                ifGNUmake='' ;
                ifNotGNUmake='#' ;
        else
                ifGNUmake='#' ;
                ifNotGNUmake='' ;
                AC_MSG_RESULT("Not found");
        fi
        AC_SUBST(ifGNUmake)
        AC_SUBST(ifNotGNUmake)
] )

# AX_CHECK_MOUNT_OPT: an autoconf macro to check for generic filesystem-
# agnostic 'mount' options. Written by Nicholas Clark. Looks for constants in
# sys/mount.h to predict whether the 'mount' utility will support a specific
# mounting option.
#
# This macro can be used to check for the presence of 'nodev' (or other mount
# options), which isn't uniformly implemented in the BSD family at the time of
# this writing. Tested on FreeBSD, NetBSD, OpenBSD, and Linux.
#
# Usage:
#
# AX_CHECK_MOUNT_OPT(option)
#
# Defines HAVE_MOUNT_$OPTION (in uppercase) if the option exists, and sets
# ac_cv_mount_$option (in original case) otherwise.
#
# Copyright (c) 2018 Nicholas Clark <nicholas.clark@gmail.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty or attribution requirement.

AC_DEFUN([AX_CHECK_MOUNT_OPT], [__AX_CHECK_MOUNT_OPT(m4_tolower([$1]),m4_toupper([$1]))])
AC_DEFUN([__AX_CHECK_MOUNT_OPT],
[
    AS_ECHO_N("checking for mount '$1' option... ")
    AC_TRY_COMPILE(
        [#include <sys/mount.h>],
        [void *temp = (void *)(MS_$2); (void) temp;],
        [AC_DEFINE(HAVE_MOUNT_$2, 1, [Define to 1 if mount supports $1.])
         AS_VAR_SET(ac_cv_mount_$1, yes)
         AS_ECHO("yes")],
        [AC_TRY_COMPILE(
            [#include <sys/mount.h>],
            [void *temp = (void *)(MNT_$2); (void) temp;],
            [AC_DEFINE(HAVE_MOUNT_$2, 1, [Define to 1 if mount supports $1.])
             AS_VAR_SET(ac_cv_mount_$1, yes)
             AS_ECHO("yes")],
            [AS_VAR_SET(ac_cv_mount_$1, no)
             AS_ECHO("no")]
        )]
    )
])
Commit	Line	Data
9519cd56 RB	1	# from http://autoconf-archive.cryp.to/ax_tls.html
	2	#
	3	# This was licensed under the GPL with the following exception:
	4	#
	5	# As a special exception, the respective Autoconf Macro's copyright
	6	# owner gives unlimited permission to copy, distribute and modify the
	7	# configure scripts that are the output of Autoconf when processing
	8	# the Macro. You need not follow the terms of the GNU General Public
	9	# License when using or distributing such scripts, even though
	10	# portions of the text of the Macro appear in them. The GNU General
	11	# Public License (GPL) does govern all other use of the material that
	12	# constitutes the Autoconf Macro.
	13	#
	14	# This special exception to the GPL applies to versions of the
	15	# Autoconf Macro released by the Autoconf Macro Archive. When you make
	16	# and distribute a modified version of the Autoconf Macro, you may
	17	# extend this special exception to the GPL to apply to your modified
	18	# version as well.
	19	#
	20	AC_DEFUN([AX_TLS], [
	21	AC_MSG_CHECKING(for thread local storage (TLS) class)
	22	AC_CACHE_VAL(ac_cv_tls, [
	23	ax_tls_keywords="__thread __declspec(thread) none"
	24	for ax_tls_keyword in $ax_tls_keywords; do
	25	case $ax_tls_keyword in
	26	none) ac_cv_tls=none ; break ;;
	27	*)
	28	AC_TRY_COMPILE(
	29	[#include <stdlib.h>
	30	static void
	31	foo(void) {
	32	static ] $ax_tls_keyword [ int bar;
	33	exit(1);
	34	}],
	35	[],
	36	[ac_cv_tls=$ax_tls_keyword ; break],
	37	ac_cv_tls=none
	38	)
	39	esac
	40	done
	41	])
	42
	43	if test "$ac_cv_tls" != "none"; then
	44	dnl AC_DEFINE([TLS], [], [If the compiler supports a TLS storage class define it to that here])
	45	AC_DEFINE_UNQUOTED([TLS], $ac_cv_tls, [If the compiler supports a TLS storage class define it to that here])
	46	fi
	47	AC_MSG_RESULT($ac_cv_tls)
	48	])
	49
	50	# ===========================================================================
	51	# http://www.nongnu.org/autoconf-archive/check_gnu_make.html
	52	# ===========================================================================
	53	#
	54	# SYNOPSIS
	55	#
	56	# CHECK_GNU_MAKE()
	57	#
	58	# DESCRIPTION
	59	#
	60	# This macro searches for a GNU version of make. If a match is found, the
	61	# makefile variable `ifGNUmake' is set to the empty string, otherwise it
	62	# is set to "#". This is useful for including a special features in a
	63	# Makefile, which cannot be handled by other versions of make. The
	64	# variable _cv_gnu_make_command is set to the command to invoke GNU make
65	# if it exists, the empty string otherwise.
66	#
67	# Here is an example of its use:
68	#
69	# Makefile.in might contain:
70	#
71	# # A failsafe way of putting a dependency rule into a makefile
72	# $(DEPEND):
73	# $(CC) -MM $(srcdir)/*.c > $(DEPEND)
74	#
75	# @ifGNUmake@ ifeq ($(DEPEND),$(wildcard $(DEPEND)))
76	# @ifGNUmake@ include $(DEPEND)
77	# @ifGNUmake@ endif
78	#
79	# Then configure.in would normally contain:
80	#
81	# CHECK_GNU_MAKE()
82	# AC_OUTPUT(Makefile)
83	#
84	# Then perhaps to cause gnu make to override any other make, we could do
85	# something like this (note that GNU make always looks for GNUmakefile
86	# first):
87	#
88	# if ! test x$_cv_gnu_make_command = x ; then
89	# mv Makefile GNUmakefile
90	# echo .DEFAULT: > Makefile ;
91	# echo \ $_cv_gnu_make_command \$@ >> Makefile;
92	# fi
93	#
94	# Then, if any (well almost any) other make is called, and GNU make also
95	# exists, then the other make wraps the GNU make.
96	#
97	# LICENSE
98	#
99	# Copyright (c) 2008 John Darrington <j.darrington@elvis.murdoch.edu.au>
100	#
101	# Copying and distribution of this file, with or without modification, are
102	# permitted in any medium without royalty provided the copyright notice
103	# and this notice are preserved.
104	#
105	# Note: Modified by Ted Ts'o to add @ifNotGNUMake@
106
107	AC_DEFUN(
108	[CHECK_GNU_MAKE], [ AC_CACHE_CHECK( for GNU make,_cv_gnu_make_command,
109	_cv_gnu_make_command='' ;
110	dnl Search all the common names for GNU make
e703ba4b	111	if test -n "$FORCE_NATIVE_MAKE" ; then
f3bc1561 TT	112	MAKES="make"
	113	else
	114	MAKES="make gmake gnumake"
	115	fi
	116	for a in "$MAKE" $MAKES ; do
9519cd56 RB	117	if test -z "$a" ; then continue ; fi ;
	118	if ( sh -c "$a --version" 2> /dev/null \| grep GNU 2>&1 > /dev/null ) ; then
	119	_cv_gnu_make_command=$a ;
	120	break;
	121	fi
	122	done ;
	123	) ;
	124	dnl If there was a GNU version, then set @ifGNUmake@ to the empty string, '#' otherwise
	125	if test "x$_cv_gnu_make_command" != "x" ; then
	126	ifGNUmake='' ;
	127	ifNotGNUmake='#' ;
	128	else
	129	ifGNUmake='#' ;
	130	ifNotGNUmake='' ;
	131	AC_MSG_RESULT("Not found");
	132	fi
	133	AC_SUBST(ifGNUmake)
	134	AC_SUBST(ifNotGNUmake)
	135	] )
ea1a3fa2 NC	136
	137	# AX_CHECK_MOUNT_OPT: an autoconf macro to check for generic filesystem-
	138	# agnostic 'mount' options. Written by Nicholas Clark. Looks for constants in
	139	# sys/mount.h to predict whether the 'mount' utility will support a specific
	140	# mounting option.
	141	#
	142	# This macro can be used to check for the presence of 'nodev' (or other mount
	143	# options), which isn't uniformly implemented in the BSD family at the time of
	144	# this writing. Tested on FreeBSD, NetBSD, OpenBSD, and Linux.
	145	#
	146	# Usage:
	147	#
	148	# AX_CHECK_MOUNT_OPT(option)
	149	#
	150	# Defines HAVE_MOUNT_$OPTION (in uppercase) if the option exists, and sets
	151	# ac_cv_mount_$option (in original case) otherwise.
	152	#
	153	# Copyright (c) 2018 Nicholas Clark <nicholas.clark@gmail.com>
	154	#
	155	# Copying and distribution of this file, with or without modification, are
	156	# permitted in any medium without royalty or attribution requirement.
	157
	158	AC_DEFUN([AX_CHECK_MOUNT_OPT], [__AX_CHECK_MOUNT_OPT(m4_tolower([$1]),m4_toupper([$1]))])
	159	AC_DEFUN([__AX_CHECK_MOUNT_OPT],
	160	[
ea1a3fa2 NC	161	AS_ECHO_N("checking for mount '$1' option... ")
	162	AC_TRY_COMPILE(
	163	[#include <sys/mount.h>],
	164	[void temp = (void )(MS_$2); (void) temp;],
	165	[AC_DEFINE(HAVE_MOUNT_$2, 1, [Define to 1 if mount supports $1.])
	166	AS_VAR_SET(ac_cv_mount_$1, yes)
	167	AS_ECHO("yes")],
	168	[AC_TRY_COMPILE(
	169	[#include <sys/mount.h>],
	170	[void temp = (void )(MNT_$2); (void) temp;],
	171	[AC_DEFINE(HAVE_MOUNT_$2, 1, [Define to 1 if mount supports $1.])
	172	AS_VAR_SET(ac_cv_mount_$1, yes)
	173	AS_ECHO("yes")],
	174	[AS_VAR_SET(ac_cv_mount_$1, no)
	175	AS_ECHO("no")]
	176	)]
	177	)
	178	])