https://bugs.exim.org/show_bug.cgi?id=2395
Bug ID: 2395
Summary: pcre_exec does not show estimated stack usage with -O2
or higher
Product: PCRE
Version: 8.43
Hardware: x86-64
OS: Linux
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: ph10@???
Reporter: nikitamalyavin@???
CC: pcre-dev@???
pcre_exec has a documented feature to return an estimated stack usage. See
https://www.pcre.org/original/doc/html/pcreapi.html#TOC1.
However,
pcre_exec(NULL, NULL, NULL, -999, -999, 0, NULL, 0)
returns -4 (PCRE_ERROR_BADMAGIC) on Arch Linux with latest pcre (as of now it
is 8.43, but the problem is also present in 8.39, which maps to Ubuntu 19.04
version).
See build recipe here:
https://git.archlinux.org/svntogit/packages.git/tree/trunk/PKGBUILD?h=packages/pcre
The package is compiled with -O2 option, which can be proven by this log:
https://tests.reproducible-builds.org/archlinux/core/pcre/build1.log
Enabling -O1 solves the problem.
It was originally found in MariaDB and is solved for bundled pcre by marking
match() function with __attribute__((noinline,noclone)) for gcc/clang
https://github.com/MariaDB/server/commit/440157cbbe796b6b9a44a3de46bbb93d0cb5a77c#diff-6d7bc8269eeb8880d60132dcf64b4be6R514
So it's reasonable to make same solution here in upstream
--
You are receiving this mail because:
You are on the CC list for the bug.
