https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66603
Bug ID: 66603 Summary: using std::cout causes segfault with unrelated array declaration Product: gcc Version: 5.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: gunney1 at llnl dot gov Target Milestone: --- Created attachment 35816 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35816&action=edit .ii file from g++ command Replicator: #include <iostream> int main () { std::cout << 1; int a[4000000]; // int *a = new int[8000000]; delete [] a; } this program segfaults with g++ (4.5.0, 4.6.1, 4.8.4, 5.1.0) but not with icpc. Oddly, commenting out the stream insert fixes the segfault. Replacing array with new/delete also works. New/delete allocates more data, so memory is not the issue here. > g++ -v -save-temps P1.C Using built-in specs. COLLECT_GCC=g++ COLLECT_LTO_WRAPPER=/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../gcc-5.1.0/configure --prefix=/home/gunney1/opt/gcc/5.1.0/installed Thread model: posix gcc version 5.1.0 (GCC) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/cc1plus -E -quiet -v -D_GNU_SOURCE P1.C -mtune=generic -march=x86-64 -fpch-preprocess -o P1.ii ignoring nonexistent directory "/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../x86_64-unknown-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../include/c++/5.1.0 /home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../include/c++/5.1.0/x86_64-unknown-linux-gnu /home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../include/c++/5.1.0/backward /home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/include /usr/local/include /home/gunney1/opt/gcc/5.1.0/installed/include /home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/include-fixed /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/cc1plus -fpreprocessed P1.ii -quiet -dumpbase P1.C -mtune=generic -march=x86-64 -auxbase P1 -version -o P1.s GNU C++ (GCC) version 5.1.0 (x86_64-unknown-linux-gnu) compiled by GNU C version 5.1.0, GMP version 4.3.1, MPFR version 2.4.1, MPC version 0.8 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C++ (GCC) version 5.1.0 (x86_64-unknown-linux-gnu) compiled by GNU C version 5.1.0, GMP version 4.3.1, MPFR version 2.4.1, MPC version 0.8 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: a812ed01a29b2a8404e588f77961fe34 COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' as -v --64 -o P1.o P1.s GNU assembler version 2.20.51.0.2 (x86_64-redhat-linux) using BFD version version 2.20.51.0.2-5.42.el6 20100205 COMPILER_PATH=/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/:/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/:/home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/:/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/:/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/ LIBRARY_PATH=/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/:/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../lib64/:/lib/../lib64/:/usr/lib/../lib64/:/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /home/gunney1/opt/gcc/5.1.0/installed/libexec/gcc/x86_64-unknown-linux-gnu/5.1.0/collect2 --eh-frame-hdr -m elf_x86_64 -dynamic-linker /lib64/ld-linux-x86-64.so.2 /usr/lib/../lib64/crt1.o /usr/lib/../lib64/crti.o /home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/crtbegin.o -L/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0 -L/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../../../lib64 -L/lib/../lib64 -L/usr/lib/../lib64 -L/home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/../../.. P1.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /home/gunney1/opt/gcc/5.1.0/installed/lib/gcc/x86_64-unknown-linux-gnu/5.1.0/crtend.o /usr/lib/../lib64/crtn.o 191051 gunney1-lx~/bugrep/gcc-cout-segfault> ./a.out Segmentation fault (core dumped)