# Configure template for gzip.
-# Copyright (C) 1999-2002, 2006-2007, 2009-2012 Free Software Foundation, Inc.
+# Copyright (C) 1999-2002, 2006-2007, 2009-2018 Free Software Foundation, Inc.
# Copyright (C) 1992-1993 Jean-loup Gailly
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
-AC_PREREQ([2.60])
+AC_PREREQ([2.63])
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_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 dist-xz color-tests parallel-tests])
+AM_INIT_AUTOMAKE([1.11 subdir-objects dist-xz dist-zip
+ 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_ARG_ENABLE([gcc-warnings],
[AS_HELP_STRING([--enable-gcc-warnings],
- [turn on lots of GCC warnings (for developers)])],
+ [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],
- [gl_gcc_warnings=no]
+ [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
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 -Wduplicated-branches" # Too many false alarms
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 -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
- nw="$nw -Wstrict-overflow" # expr.c, pr.c, tr.c, factor.c
- # initial problems in gzip
+
+ # Warnings that gzip runs afoul of but coreutils does not.
nw="$nw -Wold-style-definition"
nw="$nw -Wshadow"
- nw="$nw -Wunused-macros"
- # ?? -Wstrict-overflow
+ nw="$nw -Wstrict-overflow"
+
+ # Using -Wstrict-overflow is a pain, but the alternative is worse.
+ # For an example, see the code that provoked this report:
+ # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33498
+ # Code like that still infloops with gcc-4.6.0 and -O2. Scary indeed.
gl_MANYWARN_ALL_GCC([ws])
gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
for w in $ws; do
gl_WARN_ADD([$w])
done
- gl_WARN_ADD([-Wno-missing-field-initializers]) # We need this one
gl_WARN_ADD([-Wno-sign-compare]) # Too many warnings for now
- gl_WARN_ADD([-Wno-pointer-sign]) # Too many warnings for now
gl_WARN_ADD([-Wno-unused-parameter]) # Too many warnings for now
- gl_WARN_ADD([-Wno-overflow]) # util.c
- gl_WARN_ADD([-Wno-type-limits]) # util.c
+ gl_WARN_ADD([-Wsuggest-attribute=const])
+ gl_WARN_ADD([-Wsuggest-attribute=noreturn])
gl_WARN_ADD([-Wno-format-nonliteral])
- gl_WARN_ADD([-Wno-unsuffixed-float-constants])
+
+ # 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
AC_SUBST([WARN_CFLAGS])
AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
- AC_DEFINE([_FORTIFY_SOURCE], [2],
- [enable compile-time and run-time bounds-checking, and some warnings])
+ 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 -Wformat-truncation=2"
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_CACHE_CHECK([for an assembler syntax supported by this package],
[gzip_cv_assembler],
[gzip_cv_assembler=no
- case " $DEFS " in
- *' NO_ASM '*) ;;
+ case $DEFS in
+ *NO_ASM*) ;;
*)
if cp $srcdir/lib/match.c _match.S &&
eval "$CPP $CPPFLAGS $ASCPPFLAGS _match.S > _match.i" &&
rm -f conftest* _match.i _match.S match_.s match_.$OBJEXT;;
esac])
if test "$gzip_cv_assembler" != no; then
- AC_DEFINE(ASMV, ,
+ AC_DEFINE([ASMV], ,
[Define if an assembler version of longest_match is available.])
AC_LIBOBJ(match)
fi
projects / debian / gzip / blobdiff