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From: "augart at us dot ibm dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug optimization/12082] New: Inappropriate unreachable code warnings Date: Wed, 27 Aug 2003 20:39:00 -0000 [thread overview] Message-ID: <20030827203936.12082.augart@us.ibm.com> (raw) PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org. http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12082 Summary: Inappropriate unreachable code warnings Product: gcc Version: 3.3.1 Status: UNCONFIRMED Severity: normal Priority: P2 Component: optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: augart at us dot ibm dot com CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu Options given when GCC was configured/built: I configured gcc 3.3.1 with no options; just invoked it as ./configure. Command line that triggers the bug: g++ -v --save-temps -Wunreachable-code -O3 preprocessModifiedFiles.C -o preprocessModifiedFiles Compiler output: g++ -v --save-temps -Wunreachable-code -O3 preprocessModifiedFiles.C -o preprocessModifiedFiles Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/specs Configured with: ./configure --cache-file=config.cache Thread model: posix gcc version 3.3.1 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/cc1plus -E -D__GNUG__=3 -quiet -v -D__GNUC__=3 -D__GNUC_MINOR__=3 -D__GNUC_PATCHLEVEL__=1 -D_GNU_SOURCE preprocessModifiedFiles.C -Wunreachable-code -O3 preprocessModifiedFiles.ii ignoring nonexistent directory "NONE/include" ignoring nonexistent directory "/usr/local/i686-pc-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include/c++/3.3.1 /usr/local/include/c++/3.3.1/i686-pc-linux-gnu /usr/local/include/c++/3.3.1/backward /usr/local/include /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/include /usr/include End of search list. /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/cc1plus -fpreprocessed preprocessModifiedFiles.ii -quiet -dumpbase preprocessModifiedFiles.C -auxbase preprocessModifiedFiles -O3 -Wunreachable-code -version -o preprocessModifiedFiles.s GNU C++ version 3.3.1 (i686-pc-linux-gnu) compiled by GNU C version 3.3. GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 preprocessModifiedFiles.C: In function `int main(int, char**)': preprocessModifiedFiles.C:1147: warning: will never be executed preprocessModifiedFiles.C:1147: warning: will never be executed preprocessModifiedFiles.C:1147: warning: will never be executed preprocessModifiedFiles.C: In function `int preprocess(const char*, const char*)': preprocessModifiedFiles.C:773: warning: will never be executed preprocessModifiedFiles.C:753: warning: will never be executed preprocessModifiedFiles.C:732: warning: will never be executed preprocessModifiedFiles.C:747: warning: will never be executed preprocessModifiedFiles.C:631: warning: will never be executed preprocessModifiedFiles.C:631: warning: will never be executed preprocessModifiedFiles.C:629: warning: will never be executed /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/../../../../i686-pc-linux-gnu/bin/as -V -Qy -o preprocessModifiedFiles.o preprocessModifiedFiles.s GNU assembler version 2.14 (i686-pc-linux-gnu) using BFD version 2.14 20030612 /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/collect2 --eh-frame-hdr -m elf_i386 -dynamic-linker /lib/ld-linux.so.2 -o preprocessModifiedFiles /usr/lib/crt1.o /usr/lib/crti.o /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/crtbegin.o -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1 -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/../../../../i686-pc-linux-gnu/lib -L/usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/../../.. preprocessModifiedFiles.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/local/lib/gcc-lib/i686-pc-linux-gnu/3.3.1/crtend.o /usr/lib/crtn.o I will attach the compressed preprocessed file preprocessModifiedFiles.ii after I've submitted this report to Bugzilla; don't see how to do so upon bug creation. Why I think this is a bug: I believe the "will never be executed" warnings are incorrect. Additional details: I am running on an IBM Netvista type 6792-MHU computer, under a Red Hat 7.3 GNU/Linux distribution. Linux kernel 2.40.20, 1536MB of RAM, 1GB of swap space. Pentium 4 (1.80 GHz processor). Please let me know if I can provide you with additional information. I compiled GCC myself from the 3.3.1 tarball, using gcc 2.96. The build and install completed normally. Before I compiled gcc, I compiled and installed binutils 2.14: Bash$ gcc --version gcc (GCC) 3.3.1 [...] Bash$ as --version GNU assembler 2.14 20030612 [...] I have tried to trim down the program text I'm appending, but the really short versions don't show the warning. Sincerely Yours, --Steven Augart Jikes RVM Open Source Java Compiler Project http://www.ibm.com/developerworks/oss/jikesrvm/
next reply other threads:[~2003-08-27 20:39 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-08-27 20:39 augart at us dot ibm dot com [this message] 2003-08-27 20:41 ` [Bug optimization/12082] " augart at us dot ibm dot com 2003-08-27 20:42 ` augart at us dot ibm dot com 2003-08-27 21:57 ` bangerth at dealii dot org 2003-08-28 17:25 ` augart at us dot ibm dot com 2003-08-28 17:27 ` augart at us dot ibm dot com 2003-08-28 17:28 ` augart at us dot ibm dot com 2003-08-28 17:29 ` augart at us dot ibm dot com 2003-08-28 17:52 ` bangerth at dealii dot org 2003-08-28 17:53 ` [Bug optimization/12082] [3.3/3.4 regression] " bangerth at dealii dot org 2003-08-28 20:45 ` augart at us dot ibm dot com 2003-08-29 0:09 ` janis187 at us dot ibm dot com 2003-09-05 5:32 ` mmitchel at gcc dot gnu dot org 2003-09-06 21:26 ` cvs-commit at gcc dot gnu dot org 2003-09-06 21:50 ` cvs-commit at gcc dot gnu dot org 2003-09-07 3:21 ` pinskia at gcc dot gnu dot org
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