https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124480
Bug ID: 124480
Summary: [16 regression] g++.dg/modules/pr99023_b.X FAILs
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
Target Milestone: ---
Target: i?86-pc-solaris2.11
Between 20250708 (b7b8eb90abaeaaf4a51325e087cd43a4dac8d25a) and 20250709
(2e6dc9e19cdac43354608a1fc29fe31ec614775c),
the g++.dg/modules/pr99023_b.X test began to FAIL with a 32-bit Solaris/x86
compiler with -m64:
cc1plus: out of memory allocating 916972 bytes after a total of 9445376 bytes
A reghunt identified
commit 7135990e3b07d3f29de46e9ca7ddbb66c094d52e
Author: Mateusz Zych <[email protected]>
Date: Tue Jul 8 10:51:07 2025 +0100
libstdc++: Added missing members to numeric_limits specializations for
integer-class types
as the culprit.
I've run the failing cc1plus invocation under truss to determine the mmap{,64}
size distribution and counts for both cases:
* Before:
1 4
2 4096
8 8192
5 16384
1 24576
9 32768
1 36304
4 65536
2 131072
1 196608
2 262144
3 524288
2 1048576
1 1662976
932 2097152
2 3313664
1 4194304
* After:
746 4096
12 8192
4 16384
1 24576
7 32768
1 36304
3 65536
1 131072
1 196608
1 262144
2 524288
2 1048576
1699 2097152
1 4194304
So the number of 2 MB allocations has almost doubled, causing the 32-bit
address space to be exhausted.
