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Re: Prevent -Og from deleting stores to write-only variables


On 7/7/19 3:41 AM, Richard Sandiford wrote:
> 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).
> 
> Tested on aarch64-linux-gnu and x86_64-linux-gnu.  OK to install?
> 
> Richard
> 
> 
> 2019-07-07  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.
OK
jeff


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