From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 7790 invoked by alias); 27 Jul 2011 01:15:27 -0000 Received: (qmail 7780 invoked by uid 22791); 27 Jul 2011 01:15:27 -0000 X-SWARE-Spam-Status: No, hits=-2.7 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00,TW_BJ,TW_CX,TW_DC,TW_GX X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Wed, 27 Jul 2011 01:15:11 +0000 From: "wkoszek at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/49859] New: gcc could warn about statements between "switch" and first "case" X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Keywords: X-Bugzilla-Severity: minor X-Bugzilla-Who: wkoszek at gmail dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Message-ID: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Wed, 27 Jul 2011 01:15:00 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2011-07/txt/msg02303.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49859 Summary: gcc could warn about statements between "switch" and first "case" Product: gcc Version: 4.5.2 Status: UNCONFIRMED Severity: minor Priority: P3 Component: c AssignedTo: unassigned@gcc.gnu.org ReportedBy: wkoszek@gmail.com Created attachment 24838 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24838 Sample source code. wkoszek@wkoszek:~/p/switch$ cat switch.c #include int main(int argc, char **argv) { int type; type = 123; switch (type) { printf("SOMETHING\n"); case 1: printf("1\n"); break; case 2: printf("2\n"); break; default: printf("default\n"); return 1; } return 0; } wkoszek@wkoszek:~/p/switch$ gcc -pedantic -Wall -Wunused -Wunreachable-code -c switch.c wkoszek@wkoszek:~/p/switch$ clang -pedantic -Wall -Wunused -Wunreachable-code -c switch.c switch.c:10:3: warning: will never be executed [-Wunreachable-code] printf("SOMETHING\n"); ^~~~~~~~~~~~~~~~~~~~~ 1 warning generated. wkoszek@wkoszek:~/p/switch$ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/i386-linux-gnu/gcc/i686-linux-gnu/4.5.2/lto-wrapper Target: i686-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.5.2-8ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.5 --enable-shared --enable-multiarch --with-multiarch-defaults=i386-linux-gnu --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib/i386-linux-gnu --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib/i386-linux-gnu --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin --enable-gold --enable-ld=default --with-plugin-ld=ld.gold --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu Thread model: posix gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)