I played around a bit with cross-compiling to Win64 with mingw-w64 by adding the needed "pe-x86-64" in tools/lkl/Makefile and arch/lkl/Makefile.
"interestingly" it fails in two different ways if I add or don't add
select 64BIT if OUTPUT_FORMAT = "pe-x86-64"
in arch/lkl/Kbuild
Without it, it fails on the compilation check
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
in include/linux/bug.h
With it, it fails on
include/linux/tty.h
Width of "unused" is longer than its type
unused:BITS_PER_LONG - 2
I have tried setting BITS_PER_LONG=32 manually as a KBUILD_CFLAG
(which it should be on Win64)
I am guessing that both of these issues is due to Win64 being LLP64 which means that assumptions in compilation checks etc are not always correct.
The question is just - what would be the advisable approach - go for 64bit and try to solve the incompatibilities or rather go for 32bit and try to solve incompatibilities?
If someone smarter than me is already working on this I will just drop it :)
I played around a bit with cross-compiling to Win64 with mingw-w64 by adding the needed "pe-x86-64" in tools/lkl/Makefile and arch/lkl/Makefile.
"interestingly" it fails in two different ways if I add or don't add
select 64BIT if OUTPUT_FORMAT = "pe-x86-64"
in arch/lkl/Kbuild
Without it, it fails on the compilation check
#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))
in include/linux/bug.h
With it, it fails on
include/linux/tty.h
Width of "unused" is longer than its type
unused:BITS_PER_LONG - 2
I have tried setting BITS_PER_LONG=32 manually as a KBUILD_CFLAG
(which it should be on Win64)
I am guessing that both of these issues is due to Win64 being LLP64 which means that assumptions in compilation checks etc are not always correct.
The question is just - what would be the advisable approach - go for 64bit and try to solve the incompatibilities or rather go for 32bit and try to solve incompatibilities?
If someone smarter than me is already working on this I will just drop it :)