1 # Configure template for gzip.
3 # Copyright (C) 1999-2002, 2006-2007, 2009-2012 Free Software Foundation, Inc.
5 # Copyright (C) 1992-1993 Jean-loup Gailly
7 # This program is free software; you can redistribute it and/or modify
8 # it under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3, or (at your option)
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with this program; if not, write to the Free Software
19 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
24 m4_esyscmd([build-aux/git-version-gen .tarball-version]),
27 AC_CONFIG_SRCDIR(gzip.c)
28 AC_CONFIG_AUX_DIR(build-aux)
29 AC_CONFIG_HEADERS([lib/config.h:lib/config.hin])
30 AM_INIT_AUTOMAKE([1.11 dist-xz color-tests parallel-tests])
31 AM_SILENT_RULES([yes]) # make --enable-silent-rules the default.
36 AC_CHECK_TOOL([NM], [nm], [nm])
45 AC_ARG_ENABLE([gcc-warnings],
46 [AS_HELP_STRING([--enable-gcc-warnings],
47 [turn on lots of GCC warnings (for developers)])],
50 *) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
52 gl_gcc_warnings=$enableval],
56 if test "$gl_gcc_warnings" = yes; then
57 gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
58 AC_SUBST([WERROR_CFLAGS])
61 # This, $nw, is the list of warnings we disable.
62 nw="$nw -Wdeclaration-after-statement" # too useful to forbid
63 nw="$nw -Waggregate-return" # anachronistic
64 nw="$nw -Wlong-long" # C90 is anachronistic (lib/gethrxtime.h)
65 nw="$nw -Wc++-compat" # We don't care about C++ compilers
66 nw="$nw -Wundef" # Warns on '#if GNULIB_FOO' etc in gnulib
67 nw="$nw -Wtraditional" # Warns on #elif which we use often
68 nw="$nw -Wcast-qual" # Too many warnings for now
69 nw="$nw -Wconversion" # Too many warnings for now
70 nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings
71 nw="$nw -Wsign-conversion" # Too many warnings for now
72 nw="$nw -Wtraditional-conversion" # Too many warnings for now
73 nw="$nw -Wunreachable-code" # Too many warnings for now
74 nw="$nw -Wpadded" # Our structs are not padded
75 nw="$nw -Wredundant-decls" # openat.h declares e.g., mkdirat
76 nw="$nw -Wlogical-op" # any use of fwrite provokes this
77 nw="$nw -Wformat-nonliteral" # who.c and pinky.c strftime uses
78 nw="$nw -Wvla" # warnings in gettext.h
79 nw="$nw -Wnested-externs" # use of XARGMATCH/verify_function__
80 nw="$nw -Wswitch-enum" # Too many warnings for now
81 nw="$nw -Wswitch-default" # Too many warnings for now
82 nw="$nw -Wstack-protector" # not worth working around
83 # things I might fix soon:
84 nw="$nw -Wfloat-equal" # sort.c, seq.c
85 nw="$nw -Wmissing-format-attribute" # copy.c
86 nw="$nw -Wunsafe-loop-optimizations" # a few src/*.c
87 nw="$nw -Winline" # system.h's readdir_ignoring_dot_and_dotdot
88 nw="$nw -Wstrict-overflow" # expr.c, pr.c, tr.c, factor.c
89 # initial problems in gzip
90 nw="$nw -Wold-style-definition"
92 nw="$nw -Wunused-macros"
93 # ?? -Wstrict-overflow
95 gl_MANYWARN_ALL_GCC([ws])
96 gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
100 gl_WARN_ADD([-Wno-missing-field-initializers]) # We need this one
101 gl_WARN_ADD([-Wno-sign-compare]) # Too many warnings for now
102 gl_WARN_ADD([-Wno-pointer-sign]) # Too many warnings for now
103 gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now
104 gl_WARN_ADD([-Wno-overflow]) # util.c
105 gl_WARN_ADD([-Wno-type-limits]) # util.c
106 gl_WARN_ADD([-Wno-format-nonliteral])
107 gl_WARN_ADD([-Wno-unsuffixed-float-constants])
109 # In spite of excluding -Wlogical-op above, it is enabled, as of
110 # gcc 4.5.0 20090517, and it provokes warnings in cat.c, dd.c, truncate.c
111 gl_WARN_ADD([-Wno-logical-op])
113 gl_WARN_ADD([-fdiagnostics-show-option])
114 gl_WARN_ADD([-funit-at-a-time])
116 AC_SUBST([WARN_CFLAGS])
118 AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
119 AC_DEFINE([_FORTIFY_SOURCE], [2],
120 [enable compile-time and run-time bounds-checking, and some warnings])
121 AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])
123 # We use a slightly smaller set of warning options for lib/.
124 # Remove the following and save the result in GNULIB_WARN_CFLAGS.
126 nw="$nw -Wuninitialized"
127 nw="$nw -Wmissing-prototypes"
128 nw="$nw -Wold-style-definition"
129 gl_MANYWARN_COMPLEMENT([GNULIB_WARN_CFLAGS], [$WARN_CFLAGS], [$nw])
130 AC_SUBST([GNULIB_WARN_CFLAGS])
133 # cc -E produces incorrect asm files on SVR4, so postprocess it.
134 ASCPPPOST="sed '/^ *\\#/d; s,//.*,,; s/% /%/g; s/\\. /./g'"
135 AC_SUBST([ASCPPPOST])
137 AC_CACHE_CHECK([for underline in external names], [gzip_cv_underline],
138 [gzip_cv_underline=yes
139 AC_TRY_COMPILE([int foo() {return 0;}], [],
140 [$NM conftest.$OBJEXT | grep _foo >/dev/null 2>&1 ||
141 gzip_cv_underline=no])])
143 if test $gzip_cv_underline = no; then
144 ASCPPFLAGS='-DNO_UNDERLINE'
146 AC_SUBST([ASCPPFLAGS])
149 # Try to assemble match.S.
150 # "gcc -E match.s" ignores -E, so we must use _match.S.
151 AC_CACHE_CHECK([for an assembler syntax supported by this package],
153 [gzip_cv_assembler=no
157 if cp $srcdir/lib/match.c _match.S &&
158 eval "$CPP $CPPFLAGS $ASCPPFLAGS _match.S > _match.i" &&
159 eval "$ASCPPPOST < _match.i > match_.s"; then
160 if test ! -s match_.s || grep error < match_.s > /dev/null; then
162 elif eval "$CC $CPPFLAGS $CFLAGS -c match_.s >/dev/null" &&
163 test -f match_.$OBJEXT; then
165 gzip_cv_assembler=yes
166 if echo 'void foo (void) {}' > conftest.c &&
167 eval "$CC $CPPFLAGS $CFLAGS -S conftest.c >/dev/null" &&
168 grep '\.note\.GNU-stack' conftest.s >/dev/null &&
169 eval "$CC $CPPFLAGS $CFLAGS -c -Wa,--noexecstack match_.s >/dev/null" &&
170 test -f match_.$OBJEXT; then
171 gzip_cv_assembler='yes, with -Wa,--noexecstack'
175 rm -f conftest* _match.i _match.S match_.s match_.$OBJEXT;;
177 if test "$gzip_cv_assembler" != no; then
179 [Define if an assembler version of longest_match is available.])
182 if test "$gzip_cv_assembler" = 'yes, with -Wa,--noexecstack'; then
183 ASFLAGS_config='-Wa,--noexecstack'
187 AC_SUBST([ASFLAGS_config])
192 AC_CHECK_HEADERS_ONCE(fcntl.h limits.h memory.h time.h)
193 AC_CHECK_FUNCS_ONCE([chown fchmod fchown lstat siginterrupt])
199 AC_CONFIG_FILES([Makefile doc/Makefile lib/Makefile tests/Makefile])