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# Configure template for gzip.
# Copyright (C) 1999-2002, 2006-2007, 2009-2016 Free Software Foundation, Inc.
# Copyright (C) 1992-1993 Jean-loup Gailly
# 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, 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
AC_PREREQ([2.60])
AC_INIT([gzip],
m4_esyscmd([build-aux/git-version-gen .tarball-version]),
[bug-gzip@gnu.org])
AC_CONFIG_SRCDIR([gzip.c])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_HEADERS([lib/config.h:lib/config.hin])
AM_INIT_AUTOMAKE([1.11 subdir-objects dist-xz color-tests parallel-tests])
AM_SILENT_RULES([yes]) # make --enable-silent-rules the default.
dnl POSIXCHECK is worthwhile for maintainers, but adds several seconds
dnl (more than 10% execution time) to ./configure, with no benefit for
dnl most users. Using it to look for bugs requires:
dnl GNULIB_POSIXCHECK=1 autoreconf -f
dnl ./configure
dnl make
dnl make -C src clean
dnl make CFLAGS=-DGNULIB_POSIXCHECK=1
dnl FIXME: Once we figure out how to avoid false positives, we should
dnl have 'make my-distcheck' in dist-check.mk exercise this.
m4_syscmd([test "${GNULIB_POSIXCHECK+set}" = set])
m4_if(m4_sysval, [0], [], [dnl
gl_ASSERT_NO_GNULIB_POSIXCHECK])
AC_PROG_CC_STDC
AM_PROG_CC_C_O
AC_PROG_CPP
AC_PROG_GREP
AC_CHECK_TOOL([NM], [nm], [nm])
AC_PROG_LN_S
AC_PROG_RANLIB
AC_PROG_SHELL
gl_EARLY
gl_INIT
AC_ARG_ENABLE([gcc-warnings],
[AS_HELP_STRING([--enable-gcc-warnings],
[turn on many GCC warnings (for developers; best with GNU make)])],
[case $enableval in
yes|no) ;;
*) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
esac
gl_gcc_warnings=$enableval],
[if test -d "$srcdir"/.git; then
gl_gcc_warnings=yes
else
gl_gcc_warnings=no
fi]
)
# gl_GCC_VERSION_IFELSE([major], [minor], [run-if-found], [run-if-not-found])
# ------------------------------------------------
# If $CPP is gcc-MAJOR.MINOR or newer, then run RUN-IF-FOUND.
# Otherwise, run RUN-IF-NOT-FOUND.
AC_DEFUN([gl_GCC_VERSION_IFELSE],
[AC_PREPROC_IFELSE(
[AC_LANG_PROGRAM(
[[
#if ($1) < __GNUC__ || (($1) == __GNUC__ && ($2) <= __GNUC_MINOR__)
/* ok */
#else
# error "your version of gcc is older than $1.$2"
#endif
]]),
], [$3], [$4])
]
)
if test "$gl_gcc_warnings" = yes; then
gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
AC_SUBST([WERROR_CFLAGS])
nw=
# This, $nw, is the list of warnings we disable.
nw="$nw -Wdeclaration-after-statement" # too useful to forbid
nw="$nw -Waggregate-return" # anachronistic
nw="$nw -Wlong-long" # C90 is anachronistic (lib/gethrxtime.h)
nw="$nw -Wc++-compat" # We don't care about C++ compilers
nw="$nw -Wundef" # Warns on '#if GNULIB_FOO' etc in gnulib
nw="$nw -Wtraditional" # Warns on #elif which we use often
nw="$nw -Wcast-qual" # Too many warnings for now
nw="$nw -Wconversion" # Too many warnings for now
nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings
nw="$nw -Wsign-conversion" # Too many warnings for now
nw="$nw -Wtraditional-conversion" # Too many warnings for now
nw="$nw -Wunreachable-code" # Too many warnings for now
nw="$nw -Wpadded" # Our structs are not padded
nw="$nw -Wredundant-decls" # openat.h declares e.g., mkdirat
nw="$nw -Wlogical-op" # any use of fwrite provokes this
nw="$nw -Wformat-nonliteral" # who.c and pinky.c strftime uses
nw="$nw -Wvla" # warnings in gettext.h
nw="$nw -Wnested-externs" # use of XARGMATCH/verify_function__
nw="$nw -Wswitch-enum" # Too many warnings for now
nw="$nw -Wswitch-default" # Too many warnings for now
nw="$nw -Wstack-protector" # not worth working around
# things I might fix soon:
nw="$nw -Wfloat-equal" # sort.c, seq.c
nw="$nw -Wmissing-format-attribute" # copy.c
nw="$nw -Wunsafe-loop-optimizations" # a few src/*.c
nw="$nw -Winline" # system.h's readdir_ignoring_dot_and_dotdot
# Warnings that gzip runs afoul of but coreutils does not.
nw="$nw -Wold-style-definition"
nw="$nw -Wshadow"
nw="$nw -Wstrict-overflow"
# Using -Wstrict-overflow is a pain, but the alternative is worse.
# For an example, see the code that provoked this report:
# http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33498
# Code like that still infloops with gcc-4.6.0 and -O2. Scary indeed.
gl_MANYWARN_ALL_GCC([ws])
gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
for w in $ws; do
gl_WARN_ADD([$w])
done
gl_WARN_ADD([-Wno-sign-compare]) # Too many warnings for now
gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now
gl_WARN_ADD([-Wsuggest-attribute=const])
gl_WARN_ADD([-Wsuggest-attribute=noreturn])
gl_WARN_ADD([-Wno-format-nonliteral])
# Enable this warning only with gcc-4.7 and newer. With 4.6.2 20111027,
# it suggests test.c's advance function may be pure, even though it
# increments a global variable. Oops.
# Normally we'd write code to test for the precise failure, but that
# requires a relatively large input to make gcc exhibit the failure.
gl_GCC_VERSION_IFELSE([4], [7], [gl_WARN_ADD([-Wsuggest-attribute=pure])])
# In spite of excluding -Wlogical-op above, it is enabled, as of
# gcc 4.5.0 20090517, and it provokes warnings in cat.c, dd.c, truncate.c
gl_WARN_ADD([-Wno-logical-op])
gl_WARN_ADD([-fdiagnostics-show-option])
gl_WARN_ADD([-funit-at-a-time])
AC_SUBST([WARN_CFLAGS])
AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
AH_VERBATIM([FORTIFY_SOURCE],
[/* Enable compile-time and run-time bounds-checking, and some warnings,
without upsetting glibc 2.15+. */
#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
# define _FORTIFY_SOURCE 2
#endif
])
AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])
# We use a slightly smaller set of warning options for lib/.
# Remove the following and save the result in GNULIB_WARN_CFLAGS.
nw=
nw="$nw -Wstrict-overflow"
nw="$nw -Wuninitialized"
nw="$nw -Wunused-macros"
nw="$nw -Wmissing-prototypes"
nw="$nw -Wold-style-definition"
gl_MANYWARN_COMPLEMENT([GNULIB_WARN_CFLAGS], [$WARN_CFLAGS], [$nw])
AC_SUBST([GNULIB_WARN_CFLAGS])
fi
# cc -E produces incorrect asm files on SVR4, so postprocess it.
ASCPPPOST="sed '/^ *\\#/d; s,//.*,,; s/% /%/g; s/\\. /./g'"
AC_SUBST([ASCPPPOST])
AC_CACHE_CHECK([for underline in external names], [gzip_cv_underline],
[gzip_cv_underline=yes
AC_TRY_COMPILE([int foo() {return 0;}], [],
[$NM conftest.$OBJEXT | grep _foo >/dev/null 2>&1 ||
gzip_cv_underline=no])])
ASCPPFLAGS=
if test $gzip_cv_underline = no; then
ASCPPFLAGS='-DNO_UNDERLINE'
fi
AC_SUBST([ASCPPFLAGS])
AC_OBJEXT
# Try to assemble match.S.
# "gcc -E match.s" ignores -E, so we must use _match.S.
AC_CACHE_CHECK([for an assembler syntax supported by this package],
[gzip_cv_assembler],
[gzip_cv_assembler=no
case $DEFS in
*NO_ASM*) ;;
*)
if cp $srcdir/lib/match.c _match.S &&
eval "$CPP $CPPFLAGS $ASCPPFLAGS _match.S > _match.i" &&
eval "$ASCPPPOST < _match.i > match_.s"; then
if test ! -s match_.s || grep error < match_.s > /dev/null; then
:
elif eval "$CC $CPPFLAGS $CFLAGS -c match_.s >/dev/null" &&
test -f match_.$OBJEXT; then
rm -f match_.$OBJEXT
gzip_cv_assembler=yes
if echo 'void foo (void) {}' > conftest.c &&
eval "$CC $CPPFLAGS $CFLAGS -S conftest.c >/dev/null" &&
grep '\.note\.GNU-stack' conftest.s >/dev/null &&
eval "$CC $CPPFLAGS $CFLAGS -c -Wa,--noexecstack match_.s >/dev/null" &&
test -f match_.$OBJEXT; then
gzip_cv_assembler='yes, with -Wa,--noexecstack'
fi
fi
fi
rm -f conftest* _match.i _match.S match_.s match_.$OBJEXT;;
esac])
if test "$gzip_cv_assembler" != no; then
AC_DEFINE([ASMV], ,
[Define if an assembler version of longest_match is available.])
AC_LIBOBJ(match)
fi
if test "$gzip_cv_assembler" = 'yes, with -Wa,--noexecstack'; then
ASFLAGS_config='-Wa,--noexecstack'
else
ASFLAGS_config=
fi
AC_SUBST([ASFLAGS_config])
AC_ISC_POSIX
AC_C_CONST
AC_HEADER_STDC
AC_CHECK_HEADERS_ONCE(fcntl.h limits.h memory.h time.h)
AC_CHECK_FUNCS_ONCE([chown fchmod fchown lstat siginterrupt])
AC_HEADER_DIRENT
AC_TYPE_SIGNAL
AC_TYPE_SIZE_T
AC_TYPE_OFF_T
AC_CONFIG_FILES([Makefile doc/Makefile lib/Makefile tests/Makefile])
AC_OUTPUT
|
