From 32f99225bcaae9b792aec143239d17f2b7e2c54b Mon Sep 17 00:00:00 2001 From: Rainer Orth Date: Thu, 30 May 2024 15:00:59 +0200 Subject: ggc: Reduce GGC_QUIRE_SIZE on Solaris/SPARC [PR115031] g++.dg/modules/pr99023_b.X currently FAILs on 32-bit Solaris/SPARC: FAIL: g++.dg/modules/pr99023_b.X -std=c++2a 1 blank line(s) in output FAIL: g++.dg/modules/pr99023_b.X -std=c++2a (test for excess errors) Excess errors: cc1plus: out of memory allocating 1048344 bytes after a total of 7913472 bytes It turns out that this exhaustion of the 32-bit address space happens due to a combination of three issues: * the SPARC pagesize of 8 kB, * ggc-page.cc's chunk size of 512 * pagesize, i.e. 4 MB, and * mmap adding two 8 kB unmapped red-zone pages to each mapping which result in the 4 MB mappings to actually consume 4.5 MB of address space. To avoid this, this patch reduces the chunk size so it remains at 4 MB even when combined with the red-zone pages, as recommended by mmap(2). Tested on sparc-sun-solaris2.11 and sparcv9-sun-solaris2.11. 2024-05-29 Rainer Orth gcc: PR c++/115031 * config/sparc/sol2.h (GGC_QUIRE_SIZE): Define as 510. --- gcc/config/sparc/sol2.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'gcc') diff --git a/gcc/config/sparc/sol2.h b/gcc/config/sparc/sol2.h index 552f58b..530e681 100644 --- a/gcc/config/sparc/sol2.h +++ b/gcc/config/sparc/sol2.h @@ -38,6 +38,9 @@ along with GCC; see the file COPYING3. If not see #undef SPARC_DEFAULT_CMODEL #define SPARC_DEFAULT_CMODEL CM_MEDMID +/* Redue ggc-page.cc's chunk size to account for mmap red-zone pages. */ +#define GGC_QUIRE_SIZE 510 + /* Select a format to encode pointers in exception handling data. CODE is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is true if the symbol may be affected by dynamic relocations. -- cgit v1.1