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@hawtness ~]$ gcc -O2 -frecord-gcc-switches -g -o hello hello.c
> [jstanley@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.
~spot