On Sun, Mar 16, 2025 at 08:08:37PM +0100, Ben Hutchings wrote: > On Sat, 2025-03-15 at 14:20 +0100, Thomas Weißschuh wrote: > > -fmacro-prefix-map only affects __FILE__ and __BASE_FILE__. > > Other references, for example in debug information, are not affected. > > This makes handling of file references in the compiler outputs harder to > > use and creates problems for reproducible builds. > > > > Switch to -ffile-prefix map which affects all references. > > This appears to cover all the C sources, but not quite all the assembly > sources: > > [...] > > > --- a/arch/x86/boot/Makefile > > +++ b/arch/x86/boot/Makefile > > @@ -54,7 +54,7 @@ targets += cpustr.h > > > > KBUILD_CFLAGS := $(REALMODE_CFLAGS) -D_SETUP > > KBUILD_AFLAGS := $(KBUILD_CFLAGS) -D__ASSEMBLY__ > > -KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) > > +KBUILD_CFLAGS += $(call cc-option,-ffile-prefix-map=$(srctree)/=) > [...] > > I think this addition to KBUILD_CFLAGS needs to be done before the > assignment to KBUILD_AFLAGS. This probably belongs in KBUILD_CPPFLAGS then, similar to clang's '--target' flag and other options that we always want invoked? Cheers, Nathan
