-frecord-gcc-switches as default CFLAG?

Tom "spot" Callaway tcallawa at redhat.com
Mon Nov 1 13:04:12 UTC 2010

On 10/30/2010 06:01 AM, Richard W.M. Jones wrote:
> On Sat, Oct 30, 2010 at 02:24:02AM -0400, Jon Stanley wrote:
>> I noticed on my Fedora 13 box that in the RPM macro %__global_cflags
>> that -frecord-gcc-switches is missing, which is a nifty compiler
>> feature that will record the flags passed to gcc in a section in the
>> object file, thus aiding in the "how in the world was this compiled?"
>> problem. An example:
>> [jstanley at hawtness ~]$ gcc -O2 -frecord-gcc-switches -g -o hello hello.c
>> [jstanley at hawtness ~]$ readelf -p .GCC.command.line hello
>> String dump of section '.GCC.command.line':
>>   [     0]  hello.c
>>   [     8]  -mtune=generic
>>   [    17]  -g
>>   [    1a]  -O2
>>   [    1e]  -frecord-gcc-switches
>> What do folks think about adding this as a default? Any reason not to
>> (other than possibly a few bytes extra in the object files)?
> +1
> I think would also catch those cases where some gcc flag is found to
> break code generation.  You reasonably see which binaries were
> affected.

I agree. Unless there is a notable performance cost in this, I say we
should go for it.


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