Hi Jeff,
On 2014-10-11 04:10, Jeff Epler wrote:
> On Fri, Oct 10, 2014 at 11:23:33PM +0100, andy pugh wrote:
>> Is this likely to get good answers from gcc forums or similar?
> That idea's crazy enough that it just might work. We'll find out.
>
> http://thread.gmane.org/gmane.comp.gcc.help/47496
I was curious and have toyed.
I've tried some variations of this attributes.
__attribute__((__optimize__("no-builtin-cos,no-builtin-sin")))
__attribute__((__optimize__("no-builtin-sin")))
__attribute__((__optimize__("no-builtin")))
__attribute__((__optimize__("no-builtin-sensless")))
no error
__attribute__((__optimize__("no-builtin-")))
error: missing argument to ‘-fno-builtin-’):
__attribute__((__optimize__("no-builtin_")))
error: unrecognized command line option ‘-fno-builtin_’
__attribute__((__optimize__("no-builtin_sin")))
error: unrecognized command line option ‘-fno-builtin_sin’
Very funny, it seems there is a check if the -f option exists but then it's
ignored.
Maybe it is only working for "real" optimization options.
In the gcc man page the no-builtin options are mentioned under "C Language
Options".
Hope it helps a little bit.
Matsche
> Jeff
>
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