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From: "mdorey at bluearc dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/12667] [3.3 regression] max(enum) returns reference to temporary Date: Sat, 15 Nov 2003 14:07:00 -0000 [thread overview] Message-ID: <20031115140700.7096.qmail@sources.redhat.com> (raw) In-Reply-To: <20031017235414.12667.mdorey@bluearc.com> ------- Additional Comments From mdorey at bluearc dot com 2003-11-15 14:06 ------- (In reply to comment #2) > but since I do not know if the code invokes undefined behavior, I am not confirming this > one. Thanks for your interest. Perhaps this would be a convincing demonstration (if you can reproduce it): martind@kenny:~/playpen$ cat max-enum2.cpp #include <iostream> enum E { E1, E2 }; const E& max2(const E& a, const E& b) { return a < b ? b : a; } int main() { std::cout << max2(E1, E2) << std::endl; } martind@kenny:~/playpen$ g++ -W -Wall -pedantic -v -O2 max-enum2.cpp Reading specs from /usr/lib/gcc-lib/i486-linux/3.3.2/specs Configured with: ../src/configure -v --enable-languages=c,c++,java,f77,pascal,ob jc,ada,treelang --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-gxx-include-dir=/usr/include/c++/3.3 --enable-shared --with-system-zlib - -enable-nls --without-included-gettext --enable-__cxa_atexit --enable-clocale=gn u --enable-debug --enable-java-gc=boehm --enable-java-awt=xlib --enable-objc-gc i486-linux Thread model: posix gcc version 3.3.2 (Debian) /usr/lib/gcc-lib/i486-linux/3.3.2/cc1plus -quiet -v -D__GNUC__=3 -D__GNUC_MINOR __=3 -D__GNUC_PATCHLEVEL__=2 -D_GNU_SOURCE max-enum2.cpp -D__GNUG__=3 -quiet -du mpbase max-enum2.cpp -auxbase max-enum2 -O2 -W -Wall -pedantic -version -o /tmp/ ccNFFKYd.s GNU C++ version 3.3.2 (Debian) (i486-linux) compiled by GNU C version 3.3.2 (Debian). GGC heuristics: --param ggc-min-expand=34 --param ggc-min-heapsize=7673 ignoring nonexistent directory "/usr/i486-linux/include" #include "..." search starts here: #include <...> search starts here: /usr/include/c++/3.3 /usr/include/c++/3.3/i486-linux /usr/include/c++/3.3/backward /usr/local/include /usr/lib/gcc-lib/i486-linux/3.3.2/include /usr/include End of search list. max-enum2.cpp: In function `const E& max2(const E&, const E&)': max-enum2.cpp:6: warning: returning reference to temporary as -V -Qy -o /tmp/ccFrrEWo.o /tmp/ccNFFKYd.s GNU assembler version 2.14.90.0.7 (i386-linux) using BFD version 2.14.90.0.7 200 31029 Debian GNU/Linux /usr/lib/gcc-lib/i486-linux/3.3.2/collect2 --eh-frame-hdr -m elf_i386 -dynamic- linker /lib/ld-linux.so.2 /usr/lib/gcc-lib/i486-linux/3.3.2/../../../crt1.o /usr /lib/gcc-lib/i486-linux/3.3.2/../../../crti.o /usr/lib/gcc-lib/i486-linux/3.3.2/ crtbegin.o -L/usr/lib/gcc-lib/i486-linux/3.3.2 -L/usr/lib/gcc-lib/i486-linux/3.3 .2/../../.. /tmp/ccFrrEWo.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/li b/gcc-lib/i486-linux/3.3.2/crtend.o /usr/lib/gcc-lib/i486-linux/3.3.2/../../../c rtn.o martind@kenny:~/playpen$ ./a.out -1073742500 martind@kenny:~/playpen$ -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12667
next prev parent reply other threads:[~2003-11-15 14:07 UTC|newest] Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-10-18 0:15 [Bug c++/12667] New: " mdorey at bluearc dot com 2003-10-18 0:46 ` [Bug c++/12667] " pinskia at gcc dot gnu dot org 2003-11-15 11:31 ` [Bug c++/12667] [3.3 regression] " pinskia at gcc dot gnu dot org 2003-11-15 14:07 ` mdorey at bluearc dot com [this message] 2003-11-16 17:47 ` bangerth at dealii dot org 2003-11-16 17:55 ` falk at debian dot org 2003-11-18 5:28 ` pinskia at gcc dot gnu dot org 2003-11-19 4:23 ` gdr at integrable-solutions dot net 2003-11-20 7:16 ` mdorey at bluearc dot com 2003-11-20 7:18 ` pinskia at gcc dot gnu dot org 2003-11-20 7:23 ` mdorey at bluearc dot com 2003-12-22 23:30 ` pinskia at gcc dot gnu dot org
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