diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac new file mode 100644 index 0000000..08ad445 --- /dev/null +++ b/configure.ac @@ -0,0 +1,253 @@ +# 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 |