forked from Mirrors/btrfs-progs
btrfs-progs: build: detect whether -std=gnu90 is supported
GCC releases prior to 4.5.0 don't support -std=gnu90 so btrfs-progs won't build at all on older distros. We can detect whether the compiler supports -std=gnu90 and fall back to -std=gnu89 if it doesn't. AX_CHECK_COMPILE_FLAG is the right way to do this, but it depends on autoconf 2.64. AX_GCC_VERSION has been deprecated, so we'll use that only for earlier autoconf versions so we can drop it when we drop support for older autoconf releases. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>master
parent
1c73f56f5a
commit
eb7b42003a
1
Makefile
1
Makefile
|
@ -63,7 +63,6 @@ ABSTOPDIR = $(shell pwd)
|
||||||
TOPDIR := .
|
TOPDIR := .
|
||||||
|
|
||||||
# Common build flags
|
# Common build flags
|
||||||
CSTD = -std=gnu90
|
|
||||||
CFLAGS = $(SUBST_CFLAGS) \
|
CFLAGS = $(SUBST_CFLAGS) \
|
||||||
$(CSTD) \
|
$(CSTD) \
|
||||||
-include config.h \
|
-include config.h \
|
||||||
|
|
|
@ -4,6 +4,7 @@
|
||||||
export
|
export
|
||||||
|
|
||||||
CC = @CC@
|
CC = @CC@
|
||||||
|
CSTD = @BTRFS_CSTD_FLAGS@
|
||||||
LN_S = @LN_S@
|
LN_S = @LN_S@
|
||||||
AR = @AR@
|
AR = @AR@
|
||||||
RM = @RM@
|
RM = @RM@
|
||||||
|
|
|
@ -26,6 +26,7 @@ AC_CONFIG_SRCDIR([btrfs.c])
|
||||||
AC_PREFIX_DEFAULT([/usr/local])
|
AC_PREFIX_DEFAULT([/usr/local])
|
||||||
|
|
||||||
AC_PROG_CC
|
AC_PROG_CC
|
||||||
|
BTRFS_DETECT_CSTD
|
||||||
AC_CANONICAL_HOST
|
AC_CANONICAL_HOST
|
||||||
AC_C_CONST
|
AC_C_CONST
|
||||||
AC_C_VOLATILE
|
AC_C_VOLATILE
|
||||||
|
|
|
@ -0,0 +1,74 @@
|
||||||
|
# ===========================================================================
|
||||||
|
# https://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
|
||||||
|
# ===========================================================================
|
||||||
|
#
|
||||||
|
# SYNOPSIS
|
||||||
|
#
|
||||||
|
# AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
|
||||||
|
#
|
||||||
|
# DESCRIPTION
|
||||||
|
#
|
||||||
|
# Check whether the given FLAG works with the current language's compiler
|
||||||
|
# or gives an error. (Warnings, however, are ignored)
|
||||||
|
#
|
||||||
|
# ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
|
||||||
|
# success/failure.
|
||||||
|
#
|
||||||
|
# If EXTRA-FLAGS is defined, it is added to the current language's default
|
||||||
|
# flags (e.g. CFLAGS) when the check is done. The check is thus made with
|
||||||
|
# the flags: "CFLAGS EXTRA-FLAGS FLAG". This can for example be used to
|
||||||
|
# force the compiler to issue an error when a bad flag is given.
|
||||||
|
#
|
||||||
|
# INPUT gives an alternative input source to AC_COMPILE_IFELSE.
|
||||||
|
#
|
||||||
|
# NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
|
||||||
|
# macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
|
||||||
|
#
|
||||||
|
# LICENSE
|
||||||
|
#
|
||||||
|
# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
|
||||||
|
# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
|
||||||
|
#
|
||||||
|
# This program is free software: you can redistribute it and/or modify it
|
||||||
|
# under the terms of the GNU General Public License as published by the
|
||||||
|
# Free Software Foundation, either version 3 of the License, or (at your
|
||||||
|
# option) any later version.
|
||||||
|
#
|
||||||
|
# This program is distributed in the hope that it will be useful, but
|
||||||
|
# WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
|
||||||
|
# Public License for more details.
|
||||||
|
#
|
||||||
|
# You should have received a copy of the GNU General Public License along
|
||||||
|
# with this program. If not, see <https://www.gnu.org/licenses/>.
|
||||||
|
#
|
||||||
|
# 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 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.
|
||||||
|
|
||||||
|
#serial 5
|
||||||
|
|
||||||
|
AC_DEFUN([AX_CHECK_COMPILE_FLAG],
|
||||||
|
[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
|
||||||
|
AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
|
||||||
|
AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
|
||||||
|
ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
|
||||||
|
_AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
|
||||||
|
AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
|
||||||
|
[AS_VAR_SET(CACHEVAR,[yes])],
|
||||||
|
[AS_VAR_SET(CACHEVAR,[no])])
|
||||||
|
_AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
|
||||||
|
AS_VAR_IF(CACHEVAR,yes,
|
||||||
|
[m4_default([$2], :)],
|
||||||
|
[m4_default([$3], :)])
|
||||||
|
AS_VAR_POPDEF([CACHEVAR])dnl
|
||||||
|
])dnl AX_CHECK_COMPILE_FLAGS
|
|
@ -0,0 +1,37 @@
|
||||||
|
dnl @synopsis AX_GCC_VERSION(MAJOR, MINOR, PATCHLEVEL, [ACTION-SUCCESS], [ACTION-FAILURE])
|
||||||
|
dnl @summary check wither gcc is at least version MAJOR.MINOR.PATCHLEVEL
|
||||||
|
dnl @category InstalledPackages
|
||||||
|
dnl
|
||||||
|
dnl Check whether we are using gcc and, if so, whether its version
|
||||||
|
dnl is at least MAJOR.MINOR.PATCHLEVEL
|
||||||
|
dnl
|
||||||
|
dnl ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
|
||||||
|
dnl success/failure.
|
||||||
|
dnl
|
||||||
|
dnl @version 2005-05-30
|
||||||
|
dnl @license GPLWithACException
|
||||||
|
dnl @author Steven G. Johnson <stevenj@alum.mit.edu> and Matteo Frigo.
|
||||||
|
AC_DEFUN([AX_GCC_VERSION],
|
||||||
|
[
|
||||||
|
AC_REQUIRE([AC_PROG_CC])
|
||||||
|
AC_CACHE_CHECK(whether we are using gcc $1.$2.$3 or later, ax_cv_gcc_$1_$2_$3,
|
||||||
|
[
|
||||||
|
ax_cv_gcc_$1_$2_$3=no
|
||||||
|
if test "$GCC" = "yes"; then
|
||||||
|
dnl The semicolon after "yes" below is to pacify NeXT's syntax-checking cpp.
|
||||||
|
AC_EGREP_CPP(yes, [
|
||||||
|
#ifdef __GNUC__
|
||||||
|
# if (__GNUC__ > $1) || (__GNUC__ == $1 && __GNUC_MINOR__ > $2) \
|
||||||
|
|| (__GNUC__ == $1 && __GNUC_MINOR__ == $2 && __GNUC_PATCHLEVEL__ >= $3)
|
||||||
|
yes;
|
||||||
|
# endif
|
||||||
|
#endif
|
||||||
|
], [ax_cv_gcc_$1_$2_$3=yes])
|
||||||
|
fi
|
||||||
|
])
|
||||||
|
if test "$ax_cv_gcc_$1_$2_$3" = yes; then
|
||||||
|
m4_default([$4], :)
|
||||||
|
else
|
||||||
|
m4_default([$5], :)
|
||||||
|
fi
|
||||||
|
])
|
|
@ -0,0 +1,20 @@
|
||||||
|
dnl We prefer -std=gnu90 but gcc versions prior to 4.5.0 don't support
|
||||||
|
dnl it. AX_CHECK_COMPILE_FLAG is the right way to determine whether a
|
||||||
|
dnl particular version of gcc supports a flag, but it requires autoconf
|
||||||
|
dnl 2.64. Since (for now) we still want to support older releases
|
||||||
|
dnl that ship with autoconf 2.63, we the also-deprecated AX_GCC_VERSION
|
||||||
|
dnl macro there.
|
||||||
|
AC_DEFUN([BTRFS_DETECT_CSTD],
|
||||||
|
[
|
||||||
|
m4_version_prereq([2.64], [
|
||||||
|
AX_CHECK_COMPILE_FLAG([-std=gnu90],
|
||||||
|
[BTRFS_CSTD_FLAGS=-std=gnu90],
|
||||||
|
[BTRFS_CSTD_FLAGS=-std=gnu89])
|
||||||
|
], [
|
||||||
|
AX_GCC_VERSION([4], [5], [0],
|
||||||
|
[BTRFS_CSTD_FLAGS=-std=gnu90],
|
||||||
|
[BTRFS_CSTD_FLAGS=-std=gnu89])
|
||||||
|
])
|
||||||
|
AC_SUBST([BTRFS_CSTD_FLAGS])
|
||||||
|
]) dnl BTRFS_DETECT_CSTD
|
||||||
|
|
Loading…
Reference in New Issue