From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from depni-mx.sinp.msu.ru (depni-mx.sinp.msu.ru [213.131.7.21]) by sourceware.org (Postfix) with ESMTP id F2B363AAB010 for ; Thu, 15 Jul 2021 13:39:47 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org F2B363AAB010 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=depni.sinp.msu.ru Authentication-Results: sourceware.org; spf=none smtp.mailfrom=depni.sinp.msu.ru Received: from spider (ip-95-220-118-46.bb.netbynet.ru [95.220.118.46]) by depni-mx.sinp.msu.ru (Postfix) with ESMTPSA id 373A91BF581; Thu, 15 Jul 2021 16:39:53 +0300 (MSK) From: Serge Belyshev To: gcc-patches@gcc.gnu.org Subject: [PATCH] Add --enable-first-stage-cross configure option Date: Thu, 15 Jul 2021 16:39:47 +0300 Message-ID: <87czrj1ysc.fsf@depni.sinp.msu.ru> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Status: No, score=-8.7 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_STATUS, KAM_LAZY_DOMAIN_SECURITY, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 15 Jul 2021 13:39:51 -0000 Add --enable-first-stage-cross configure option Build static-only, C-only compiler that is sufficient to cross compile glibc. This option disables various runtime libraries that require libc to compile, turns on --with-newlib, --without-headers, --disable-decimal-float, --disable-shared, --disable-threads, and sets --enable-languages=c. Rationale: current way of building first stage compiler of a cross toolchain requires specifying a list of target libraries that are not going to be compiled due to their dependency on target libc. This list is not documented in gccinstall.texi and sometimes changes. To simplify the procedure, it is better to maintain that list in the GCC itself. Usage example as a patch to glibc's scripts/build-many-libcs.py: diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py index 580d25e8ee..3a6a7be76b 100755 --- a/scripts/build-many-glibcs.py +++ b/scripts/build-many-glibcs.py @@ -1446,17 +1446,7 @@ class Config(object): # required to define inhibit_libc (to stop some parts of # libgcc including libc headers); --without-headers is not # sufficient. - cfg_opts += ['--enable-languages=c', '--disable-shared', - '--disable-threads', - '--disable-libatomic', - '--disable-decimal-float', - '--disable-libffi', - '--disable-libgomp', - '--disable-libitm', - '--disable-libmpx', - '--disable-libquadmath', - '--disable-libsanitizer', - '--without-headers', '--with-newlib', + cfg_opts += ['--enable-first-stage-cross', '--with-glibc-version=%s' % self.ctx.glibc_version ] cfg_opts += self.first_gcc_cfg Bootstrapped/regtested on x86_64-pc-linux-gnu, and tested with build-many-glibcs.py with the above patch. OK for mainline? ChangeLog: * configure.ac: Add --enable-first-stage-cross. * configure: Regenerate. gcc/ChangeLog: * doc/install.texi: Document --enable-first-stage-cross. --- configure | 20 ++++++++++++++++++++ configure.ac | 15 +++++++++++++++ gcc/doc/install.texi | 7 +++++++ 3 files changed, 42 insertions(+) diff --git a/configure b/configure index 85ab9915402..df59036e258 100755 --- a/configure +++ b/configure @@ -787,6 +787,7 @@ ac_user_opts=' enable_option_checking with_build_libsubdir with_system_zlib +enable_first_stage_cross enable_as_accelerator_for enable_offload_targets enable_offload_defaulted @@ -1514,6 +1515,9 @@ Optional Features: --disable-option-checking ignore unrecognized --enable/--with options --disable-FEATURE do not include FEATURE (same as --enable-FEATURE=no) --enable-FEATURE[=ARG] include FEATURE [ARG=yes] + --enable-first-stage-cross + Build a static-only compiler that is sufficient to + build glibc. --enable-as-accelerator-for=ARG build as offload target compiler. Specify offload host triple by ARG @@ -2961,6 +2965,22 @@ case $is_cross_compiler in no) skipdirs="${skipdirs} ${cross_only}" ;; esac +# Check whether --enable-first-stage-cross was given. +if test "${enable_first_stage_cross+set}" = set; then : + enableval=$enable_first_stage_cross; ENABLE_FIRST_STAGE_CROSS=$enableval +else + ENABLE_FIRST_STAGE_CROSS=no +fi + +case "${ENABLE_FIRST_STAGE_CROSS}" in + yes) + noconfigdirs="$noconfigdirs target-libatomic target-libquadmath target-libgomp target-libssp" + host_configargs="$host_configargs --disable-shared --disable-threads --disable-decimal-float --without-headers --with-newlib" + target_configargs="$target_configargs --disable-shared" + enable_languages=c + ;; +esac + # If both --with-headers and --with-libs are specified, default to # --without-newlib. if test x"${with_headers}" != x && test x"${with_headers}" != xno \ diff --git a/configure.ac b/configure.ac index 1df038b04f3..53f920c1a2c 100644 --- a/configure.ac +++ b/configure.ac @@ -268,6 +268,21 @@ case $is_cross_compiler in no) skipdirs="${skipdirs} ${cross_only}" ;; esac +AC_ARG_ENABLE(first-stage-cross, +[AS_HELP_STRING([--enable-first-stage-cross], + [Build a static-only compiler that is + sufficient to build glibc.])], +ENABLE_FIRST_STAGE_CROSS=$enableval, +ENABLE_FIRST_STAGE_CROSS=no) +case "${ENABLE_FIRST_STAGE_CROSS}" in + yes) + noconfigdirs="$noconfigdirs target-libatomic target-libquadmath target-libgomp target-libssp" + host_configargs="$host_configargs --disable-shared --disable-threads --disable-decimal-float --without-headers --with-newlib" + target_configargs="$target_configargs --disable-shared" + enable_languages=c + ;; +esac + # If both --with-headers and --with-libs are specified, default to # --without-newlib. if test x"${with_headers}" != x && test x"${with_headers}" != xno \ diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index 6eee1bb43d4..b19923769e0 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -2501,6 +2501,13 @@ When you use this option, you should ensure that @var{dir} includes @command{ranlib} and @command{strip} if necessary, and possibly @command{objdump}. Otherwise, GCC may use an inconsistent set of tools. + +@item --enable-first-stage-cross +Build static-only, C-only compiler that is sufficient to cross compile glibc. +This option disables various runtime libraries that require libc to compile, +turns on @option{--with-newlib}, @option{--without-headers}, +@option{--disable-decimal-float}, @option{--disable-shared}, +@option{--disable-threads} and sets @option{--enable-languages=c}. @end table @subsubheading Overriding @command{configure} test results