8 янв. 2015 г. 0:57 пользователь "Paul Bolle" <[email protected]> написал: > > On Wed, 2015-01-07 at 23:59 +0600, Alexander Kuleshov wrote: > > Yes i saw video-*.c files, but i can't understand how compilation of > > these video-*.c files depends on _WAKEUP macro... > > > > For example if'd remove -D_WAKEUP, i get errors during realmode.elf linking: > > > > arch/x86/realmode/rm/video-vga.o: In function `vga_probe': > > /home/alex/dev/linux/arch/x86/realmode/rm/../../boot/video-vga.c:259: > > undefined reference to `boot_params' > > > > As you wrote there are many #ifndef/#endif directives, but why there > > _WAKEUP is undefined everytime, but we pass it from command line with > > -D_WAKEUP? > > Because these file also get compiled via arch/x86/boot/Makefile? Ie, I > _guess_ _WAKEUP is needed to ensure the compile started from > arch/x86/realmode/rm/Makefile differs from the compile started from > arch/x86/boot/Makefile. But [...]/boot/Makefile is sufficiently > complicated for me to stop me from looking at it too long! > > You do realize that the Linux kernel is a treasure trove for people > wanting to know just how far make, gcc, etc can be pushed, don't you? > > > Paul Bolle >
That's true
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