From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 31921 invoked by alias); 16 Oct 2009 16:51:52 -0000 Received: (qmail 31863 invoked by uid 48); 16 Oct 2009 16:51:30 -0000 Date: Fri, 16 Oct 2009 16:51:00 -0000 Message-ID: <20091016165130.31862.qmail@sourceware.org> X-Bugzilla-Reason: CC References: Subject: [Bug middle-end/35903] false warning when passing quoted string to function strcmp(arg,"no"); In-Reply-To: Reply-To: gcc-bugzilla@gcc.gnu.org To: gcc-bugs@gcc.gnu.org From: "cepeda at gmail dot com" 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: 2009-10/txt/msg01468.txt.bz2 ------- Comment #3 from cepeda at gmail dot com 2009-10-16 16:51 ------- This bug has no changed for months, I think it is still active. It seems not to work only when size of char[] is 3 (2+'\0'). A test case is this: // Begin of code #include #include int main(int argc, char **argv) { printf("%d",strcmp(argv[0],"A")); // NO warning printf("%d",strcmp(argv[0],"AA")); // warning: array subscript printf("%d",strcmp(argv[0],"AAA")); // NO warning return 0; } // End of code The compilation says: $ gcc -v -save-temps -O3 -fno-builtin -funsigned-char -Wall test.c Using built-in specs. Target: i486-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.1-4ubuntu8' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i486 --with-tune=generic --enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu Thread model: posix gcc version 4.4.1 (Ubuntu 4.4.1-4ubuntu8) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-fno-builtin' '-funsigned-char' '-Wall' '-mtune=generic' '-march=i486' /usr/lib/gcc/i486-linux-gnu/4.4.1/cc1 -E -quiet -v test.c -D_FORTIFY_SOURCE=2 -mtune=generic -march=i486 -Wall -fno-builtin -funsigned-char -O3 -fpch-preprocess -fstack-protector -o test.i ignoring nonexistent directory "/usr/local/include/i486-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../i486-linux-gnu/include" ignoring nonexistent directory "/usr/include/i486-linux-gnu" #include "..." search starts here: #include <...> search starts here: /usr/local/include /usr/lib/gcc/i486-linux-gnu/4.4.1/include /usr/lib/gcc/i486-linux-gnu/4.4.1/include-fixed /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-fno-builtin' '-funsigned-char' '-Wall' '-mtune=generic' '-march=i486' /usr/lib/gcc/i486-linux-gnu/4.4.1/cc1 -fpreprocessed test.i -quiet -dumpbase test.c -mtune=generic -march=i486 -auxbase test -O3 -Wall -version -fno-builtin -funsigned-char -fstack-protector -o test.s GNU C (Ubuntu 4.4.1-4ubuntu8) version 4.4.1 (i486-linux-gnu) compiled by GNU C version 4.4.1, GMP version 4.3.1, MPFR version 2.4.1-p2. GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 293503c4ddf766b61fc5ff6a5ff38cdc test.c: In function ‘main’: test.c:7: warning: array subscript is above array bounds COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-fno-builtin' '-funsigned-char' '-Wall' '-mtune=generic' '-march=i486' as -V -Qy -o test.o test.s GNU assembler version 2.19.92 (i486-linux-gnu) using BFD version (GNU Binutils for Ubuntu) 2.19.92.20091014 COMPILER_PATH=/usr/lib/gcc/i486-linux-gnu/4.4.1/:/usr/lib/gcc/i486-linux-gnu/4.4.1/:/usr/lib/gcc/i486-linux-gnu/:/usr/lib/gcc/i486-linux-gnu/4.4.1/:/usr/lib/gcc/i486-linux-gnu/:/usr/lib/gcc/i486-linux-gnu/4.4.1/:/usr/lib/gcc/i486-linux-gnu/ LIBRARY_PATH=/usr/lib/gcc/i486-linux-gnu/4.4.1/:/usr/lib/gcc/i486-linux-gnu/4.4.1/:/usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/:/lib/../lib/:/usr/lib/../lib/:/usr/lib/gcc/i486-linux-gnu/4.4.1/../../../:/lib/:/usr/lib/:/usr/lib/i486-linux-gnu/ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-O3' '-fno-builtin' '-funsigned-char' '-Wall' '-mtune=generic' '-march=i486' /usr/lib/gcc/i486-linux-gnu/4.4.1/collect2 --build-id --eh-frame-hdr -m elf_i386 --hash-style=both -dynamic-linker /lib/ld-linux.so.2 -z relro /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crt1.o /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crti.o /usr/lib/gcc/i486-linux-gnu/4.4.1/crtbegin.o -L/usr/lib/gcc/i486-linux-gnu/4.4.1 -L/usr/lib/gcc/i486-linux-gnu/4.4.1 -L/usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib -L/lib/../lib -L/usr/lib/../lib -L/usr/lib/gcc/i486-linux-gnu/4.4.1/../../.. -L/usr/lib/i486-linux-gnu test.o -lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc --as-needed -lgcc_s --no-as-needed /usr/lib/gcc/i486-linux-gnu/4.4.1/crtend.o /usr/lib/gcc/i486-linux-gnu/4.4.1/../../../../lib/crtn.o -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35903