r273870 - in /trunk/gcc: ChangeLog testsuite/Ch...

[rsandifo at gcc dot gnu dot org]

Author: rsandifo
Date: Mon Jul 29 08:46:54 2019
New Revision: 273870

URL: https://gcc.gnu.org/viewcvs?rev=273870&root=gcc&view=rev
Log:
Prevent -Og from deleting stores to write-only variables

This patch prevents -Og from deleting stores to write-only variables,
so that the values are still available when debugging.  This seems
more convenient than forcing users to use __attribute__((used))
(probably conditionally, if it's not something they want in release
builds).

2019-07-29  Richard Sandiford  <richard.sandiford@arm.com>

gcc/
	* tree-cfg.c (execute_fixup_cfg): Don't delete stores to write-only
	variables for -Og.

gcc/testsuite/
	* c-c++-common/guality/Og-static-wo-1.c: New test.
	* g++.dg/guality/guality.exp: Separate the c-c++-common tests into
	"Og" and "general" tests.  Run the latter at -O0 and -Og only.
	* gcc.dg/guality/guality.exp: Likewise.

Added:
    trunk/gcc/testsuite/c-c++-common/guality/Og-static-wo-1.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/guality/guality.exp
    trunk/gcc/testsuite/gcc.dg/guality/guality.exp
    trunk/gcc/tree-cfg.c