[FFmpeg-devel] How to wire asm to the makefile

Book Moons waic9e at protonmail.com
Tue Jul 10 05:18:12 EEST 2018


Cleaning the build folder did the trick. Hadn't even thought of it. Prior builds had an exploratory C version. Appreciate it.

On July 9, 2018 4:49 PM, James Almer <jamrial at gmail.com> wrote:

> On 7/9/2018 1:29 AM, Book Moons wrote:
> 
> > Hello,
> > 
> > I have a Power optimized function in asm for an upcoming patch. Having some trouble figuring out how to wire it up to the makefiles / build system. Are there any docs on how to do that?
> > 
> > The only other example of Power asm seems to be libavcodec/ppc/fft_altivec.S. That's simply appended to the OBJS-yes variable:
> > 
> > OBJS-$(CONFIG_FFT) += ppc/fft_init.o
> > 
> > ppc/fft_altivec.o
> > 
> > ppc/fft_vsx.o
> > 
> > Doing the same thing in the relevant makefile (for libswscale/ppc) doesn't seem to work.
> > 
> > OBJS += ppc/swscale_altivec.o
> > 
> > ppc/yuv2rgb_altivec.o
> > 
> > ppc/yuv2yuv_altivec.o
> > 
> > ppc/hScale8To15_vsx.o
> > 
> > It looks for a .c file. Building with that change gives this error:
> > 
> > > make: *** No rule to make target 'src/libswscale/ppc/hScale8To15_vsx.c', needed by 'libswscale/ppc/hScale8To15_vsx.o'. Stop.
> 
> First, always make sure to clean the build folder. Rogue .d files
> 
> (created by the build system) usually result in gnu make assuming wrong
> 
> dependencies if you made some changes to the source tree after they were
> 
> created.
> 
> That aside, are you sure your file is called hScale8To15_vsx.S and not
> 
> hScale8To15_vsx.s? The build system expects .S, not .s
> 
> Otherwise, I can't say why it looks for a .c file when in libavcodec it
> 
> handles fft_altivec.S just fine.
> 
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> 
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> 
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