From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from elaine.keithp.com (home.keithp.com [63.227.221.253]) by sourceware.org (Postfix) with ESMTPS id CD1143858C54 for ; Sun, 5 Feb 2023 07:10:46 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org CD1143858C54 Authentication-Results: sourceware.org; dmarc=pass (p=quarantine dis=none) header.from=keithp.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=keithp.com Received: from localhost (localhost [127.0.0.1]) by elaine.keithp.com (Postfix) with ESMTP id D57883F33F09; Sat, 4 Feb 2023 23:10:45 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=keithp.com; s=mail; t=1675581045; bh=G8/XFyptBKEuYWtED0vxBnCh0ItWH0k8E3l5F0lwj/c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RQRkQHjfObhMGNEmQBTkIU088T5IpCF2roUi+06zc2O8KNhfX7yWnKyFhxp2cMuyt PTKtaaQlKEUQy0QOuYKaY83OZg6T2L6plNTi3iHYSKnM4mRaZ385NVCmrIm+UbosIO cSBmpefKosxyxt0FGKk5jryfaUhdMQJgKCJHhR4COC7aemSKwXBgmKJpzT6GLVGNVK Mydg2vw4yfJmSFrtAOqYfhlWjWFAp5r2mnmCwrvuij/+zWezI2eJUM8HHkAbtEek/1 cOs5EnfKxKNMtBSbWJvpl/1Pz3FpRv+mp/Fy3K/s5QRN6mtIhO8uyBp/8ZGwEXXaFH 1upxjuy//00xA== X-Virus-Scanned: Debian amavisd-new at keithp.com Received: from elaine.keithp.com ([127.0.0.1]) by localhost (elaine.keithp.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id iBBFBFeCp84i; Sat, 4 Feb 2023 23:10:43 -0800 (PST) Received: from keithp.com (koto.keithp.com [192.168.11.2]) by elaine.keithp.com (Postfix) with ESMTPSA id EE2CC3F33F08; Sat, 4 Feb 2023 23:10:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=keithp.com; s=mail; t=1675581042; bh=G8/XFyptBKEuYWtED0vxBnCh0ItWH0k8E3l5F0lwj/c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CZF8G1SYzD16YZLyJXt7FkrruP/b7T4zb6i3vSkx1E6Rcmue2eBp8hZRlKLqLtODP 0nTIKZWKaxcF7b8NIe6kZzx55DdRGLh0ITSXDjtRlNqAzdEWcx1KAA0/CIfS5U6Bq9 s9KI7YRqG+2M1ZG79x531PtsbS2gonojQz+8ouTUWgSyf3Iy0Quo2ELh39zRFh51nE 8NeI4Sv4la0MJZUMcxPDRTdMMG8o28qDUH2rFpSrvkTLep7WKpheZC/046giCRCGFB wckFSYyys4jn1/1r+kNfhYaQMD0YiA6KJ9HIScB3dgukcwYa/+5JlzdsXIJlWZZak4 TmLERYM2pQAaQ== Received: by keithp.com (Postfix, from userid 1000) id 9C2D31E600C8; Sat, 4 Feb 2023 23:10:42 -0800 (PST) From: Keith Packard To: gcc-patches@gcc.gnu.org Cc: Keith Packard , Andrew Pinski , Kito Cheng , Richard Sandiford , Sebastian Huber Subject: [PATCH 1/3] Allow default libc to be specified to configure Date: Sat, 4 Feb 2023 23:10:34 -0800 Message-Id: <0fc05b2872263eec6df97393edb4912dcf6d3cc6.1675579641.git.keithp@keithp.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: References: <20220903060707.1622470-1-keithp@keithp.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-10.7 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: The default C library is normally computed based on the target triplet. However, for embedded systems, it can be useful to leave the triplet alone while changing which C library is used by default. Other C libraries may still be available on the system so the compiler and can be used by specifying suitable include and library paths at build time. If an unknown --with-default-libc= value is provided, emit an error and stop. Signed-off-by: Keith Packard --- gcc/config.gcc | 48 ++++++++++++++++++++++++++++++++++++++++-------- gcc/configure.ac | 4 ++++ 2 files changed, 44 insertions(+), 8 deletions(-) diff --git a/gcc/config.gcc b/gcc/config.gcc index f0958e1c959..0679a76bebb 100644 --- a/gcc/config.gcc +++ b/gcc/config.gcc @@ -663,6 +663,8 @@ esac # Common C libraries. tm_defines="$tm_defines LIBC_GLIBC=1 LIBC_UCLIBC=2 LIBC_BIONIC=3 LIBC_MUSL=4" +default_libc="" + # 32-bit x86 processors supported by --with-arch=. Each processor # MUST be separated by exactly one space. x86_archs="athlon athlon-4 athlon-fx athlon-mp athlon-tbird \ @@ -869,16 +871,16 @@ case ${target} in esac case $target in *-*-*android*) - tm_defines="$tm_defines DEFAULT_LIBC=LIBC_BIONIC" + default_libc=LIBC_BIONIC ;; *-*-*uclibc* | *-*-uclinuxfdpiceabi) - tm_defines="$tm_defines DEFAULT_LIBC=LIBC_UCLIBC" + default_libc=LIBC_UCLIBC ;; *-*-*musl*) - tm_defines="$tm_defines DEFAULT_LIBC=LIBC_MUSL" + default_libc=LIBC_MUSL ;; *) - tm_defines="$tm_defines DEFAULT_LIBC=LIBC_GLIBC" + default_libc=LIBC_GLIBC ;; esac # Assume that glibc or uClibc or Bionic are being used and so __cxa_atexit @@ -987,7 +989,8 @@ case ${target} in case ${enable_threads} in "" | yes | posix) thread_file='posix' ;; esac - tm_defines="$tm_defines DEFAULT_LIBC=LIBC_UCLIBC SINGLE_LIBC" + tm_defines="$tm_defines SINGLE_LIBC" + default_libc=LIBC_UCLIBC ;; *-*-rdos*) use_gcc_stdint=wrap @@ -1651,13 +1654,13 @@ csky-*-*) case ${target} in csky-*-linux-gnu*) - tm_defines="$tm_defines DEFAULT_LIBC=LIBC_GLIBC" + default_libc=LIBC_GLIBC # Force .init_array support. The configure script cannot always # automatically detect that GAS supports it, yet we require it. gcc_cv_initfini_array=yes ;; csky-*-linux-uclibc*) - tm_defines="$tm_defines DEFAULT_LIBC=LIBC_UCLIBC" + default_libc=LIBC_UCLIBC default_use_cxa_atexit=no ;; *) @@ -3037,7 +3040,7 @@ powerpc*-wrs-vxworks7r*) tmake_file="${tmake_file} t-linux rs6000/t-linux64 rs6000/t-fprules rs6000/t-ppccomm" tmake_file="${tmake_file} rs6000/t-vxworks" - tm_defines="$tm_defines DEFAULT_LIBC=LIBC_GLIBC" + default_libc=LIBC_GLIBC extra_objs="$extra_objs linux.o rs6000-linux.o" ;; powerpc-wrs-vxworks*) @@ -5862,3 +5865,32 @@ i[34567]86-*-* | x86_64-*-*) fi ;; esac + +case "${with_default_libc}" in +glibc) + default_libc=LIBC_GLIBC + ;; +uclibc) + default_libc=LIBC_UCLIBC + ;; +bionic) + default_libc=LIBC_BIONIC + ;; +musl) + default_libc=LIBC_MUSL + ;; +"") + ;; +*) + echo "Unknown libc in --with-default-libc=$with_default_libc" 1>&2 + exit 1 + ;; +esac + +case "$default_libc" in +"") + ;; +*) + tm_defines="$tm_defines DEFAULT_LIBC=$default_libc" + ;; +esac diff --git a/gcc/configure.ac b/gcc/configure.ac index 62bc908b991..c30e3c7ae72 100644 --- a/gcc/configure.ac +++ b/gcc/configure.ac @@ -2481,6 +2481,10 @@ if { { test x$host != x$target && test "x$with_sysroot" = x ; } || fi AC_SUBST(inhibit_libc) +AC_ARG_WITH(default-libc, + [AS_HELP_STRING([--with-default-libc], + [Use specified default C library])]) + # When building gcc with a cross-compiler, we need to adjust things so # that the generator programs are still built with the native compiler. # Also, we cannot run fixincludes. -- 2.39.0