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* [Bug c++/56973] New: crash when capturing variables in nested lambdas @ 2013-04-15 18:35 dirkmoermans at gmail dot com 2013-04-21 11:41 ` [Bug c++/56973] " dirkmoermans at gmail dot com ` (3 more replies) 0 siblings, 4 replies; 5+ messages in thread From: dirkmoermans at gmail dot com @ 2013-04-15 18:35 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56973 Bug #: 56973 Summary: crash when capturing variables in nested lambdas Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: dirkmoermans@gmail.com The valid C++11 program below segfaults on my machine: ===== #include <cassert> #include <cstring> #include <iterator> void test(const char* s) { constexpr /*static*/ struct {const char* s;} ar[]={ {"e4"}, {"e5"}, {"Nf3"}, {"Nc6"}, {"Bb5"}, {"a6"} }; auto it=std::begin(ar); auto compare=[&it](const char* s) { assert(std::strcmp(it->s,s)==0); }; auto test=[&](const char* s) { it=std::begin(ar); compare(s); }; test(s); } int main(int argc, const char* argv[]) { test(argv[1]); test(argv[2]); test(argv[3]); return 0; } ===== I compile with: $ g++ -g -O --std=c++11 bug.cc. I run as: $ ./a.out e4 e4 e4 My machine is a 64 bit linux intel core duo 2 (T4200). If I make "ar" static the program passes, so I assume that ar is overwritten prematurely on the stack. The error only occurs from optimization-levels "-O" onwards. ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/56973] crash when capturing variables in nested lambdas 2013-04-15 18:35 [Bug c++/56973] New: crash when capturing variables in nested lambdas dirkmoermans at gmail dot com @ 2013-04-21 11:41 ` dirkmoermans at gmail dot com 2013-04-21 11:43 ` dirkmoermans at gmail dot com ` (2 subsequent siblings) 3 siblings, 0 replies; 5+ messages in thread From: dirkmoermans at gmail dot com @ 2013-04-21 11:41 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56973 --- Comment #1 from Dirk Moermans <dirkmoermans at gmail dot com> 2013-04-21 11:41:33 UTC --- Created attachment 29909 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29909 preprocessed file ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/56973] crash when capturing variables in nested lambdas 2013-04-15 18:35 [Bug c++/56973] New: crash when capturing variables in nested lambdas dirkmoermans at gmail dot com 2013-04-21 11:41 ` [Bug c++/56973] " dirkmoermans at gmail dot com @ 2013-04-21 11:43 ` dirkmoermans at gmail dot com 2013-04-24 9:38 ` paolo.carlini at oracle dot com 2013-07-10 23:30 ` paolo.carlini at oracle dot com 3 siblings, 0 replies; 5+ messages in thread From: dirkmoermans at gmail dot com @ 2013-04-21 11:43 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56973 --- Comment #2 from Dirk Moermans <dirkmoermans at gmail dot com> 2013-04-21 11:43:02 UTC --- the output of gcc -v Using built-in specs. COLLECT_GCC=g++-4.8.0 COLLECT_LTO_WRAPPER=/home/dirk/local/libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ./configure --prefix=/home/dirk/local --program-suffix=-4.8.0 --enable-languages=c,c++ Thread model: posix gcc version 4.8.0 (GCC) ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/56973] crash when capturing variables in nested lambdas 2013-04-15 18:35 [Bug c++/56973] New: crash when capturing variables in nested lambdas dirkmoermans at gmail dot com 2013-04-21 11:41 ` [Bug c++/56973] " dirkmoermans at gmail dot com 2013-04-21 11:43 ` dirkmoermans at gmail dot com @ 2013-04-24 9:38 ` paolo.carlini at oracle dot com 2013-07-10 23:30 ` paolo.carlini at oracle dot com 3 siblings, 0 replies; 5+ messages in thread From: paolo.carlini at oracle dot com @ 2013-04-24 9:38 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56973 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2013-04-24 Blocks| |54367 Ever Confirmed|0 |1 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/56973] crash when capturing variables in nested lambdas 2013-04-15 18:35 [Bug c++/56973] New: crash when capturing variables in nested lambdas dirkmoermans at gmail dot com ` (2 preceding siblings ...) 2013-04-24 9:38 ` paolo.carlini at oracle dot com @ 2013-07-10 23:30 ` paolo.carlini at oracle dot com 3 siblings, 0 replies; 5+ messages in thread From: paolo.carlini at oracle dot com @ 2013-07-10 23:30 UTC (permalink / raw) To: gcc-bugs http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56973 Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |wrong-code Priority|P3 |P2 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-07-10 23:30 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-04-15 18:35 [Bug c++/56973] New: crash when capturing variables in nested lambdas dirkmoermans at gmail dot com 2013-04-21 11:41 ` [Bug c++/56973] " dirkmoermans at gmail dot com 2013-04-21 11:43 ` dirkmoermans at gmail dot com 2013-04-24 9:38 ` paolo.carlini at oracle dot com 2013-07-10 23:30 ` paolo.carlini at oracle dot com
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