https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103764
Bug ID: 103764
Summary: Global std::string constructor not called
Product: gcc
Version: 11.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jeanmichael.celerier at gmail dot com
Target Milestone: ---
Repro:
foo.cpp:
#include <string>
std::string my_global_string(100, 'x');
main.cpp:
#include <string>
#include <iostream>
extern std::string my_global_string;
int main() {
std::cout << my_global_string << std::endl;
}
Build:
$ g++ foo.cpp -shared -O3 -fPIC -o libfoo.so
$ g++ main.cpp -shared -O3 -fPIC -L$PWD -lfoo
Run:
$ LD_LIBRARY_PATH=$PWD ./a.out
[1] 66470 segmentation fault (core dumped) ./a.out
Valgrind:
$ valgrind -s ./a.out
==66587== Memcheck, a memory error detector
==66587== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==66587== Using Valgrind-3.17.0 and LibVEX; rerun with -h for copyright info
==66587== Command: ./a.out
==66587==
==66587== Invalid read of size 8
==66587== at 0x1090B5: main (in /tmp/a.out)
==66587== Address 0x8 is not stack'd, malloc'd or (recently) free'd
==66587==
==66587==
==66587== Process terminating with default action of signal 11 (SIGSEGV):
dumping core
==66587== Access not within mapped region at address 0x8
==66587== at 0x1090B5: main (in /tmp/a.out)
==66587== If you believe this happened as a result of a stack
==66587== overflow in your program's main thread (unlikely but
==66587== possible), you can try to increase the size of the
==66587== main thread stack using the --main-stacksize= flag.
==66587== The main thread stack size used in this run was 8388608.
==66587==
==66587== HEAP SUMMARY:
==66587== in use at exit: 0 bytes in 0 blocks
==66587== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==66587==
==66587== All heap blocks were freed -- no leaks are possible
==66587==
==66587== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
==66587==
==66587== 1 errors in context 1 of 1:
==66587== Invalid read of size 8
==66587== at 0x1090B5: main (in /tmp/a.out)
==66587== Address 0x8 is not stack'd, malloc'd or (recently) free'd
==66587==
==66587== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
[1] 66587 segmentation fault (core dumped) valgrind -s ./a.out
