When building kernel code on a non-FreeBSD system, kernel source still
expects pre-processor macros to be those of a FreeBSD system. If
__linux__ is defined, build will break. If __FreeBSD__ isn't defined,
build will break too.
This small patch "fakes" the pre-processor macros of FreeBSD so that
non-FreeBSD systems such as GNU/Linux can build the kernel of FreeBSD
too.
--
Robert Millan
--- a/sys/conf/kern.pre.mk
+++ b/sys/conf/kern.pre.mk
@@ -90,6 +90,14 @@
.endif
WERROR?= -Werror
+.if !defined(OPSYS)
+OPSYS!= uname -s
+.endif
+
+.if ${OPSYS} != "FreeBSD"
+CFLAGS+= -Ulinux -U__linux__ -D__FreeBSD__
+.endif
+
# XXX LOCORE means "don't declare C stuff" not "for locore.s".
ASM_CFLAGS= -x assembler-with-cpp -DLOCORE ${CFLAGS}
--- a/sys/conf/kmod.mk
+++ b/sys/conf/kmod.mk
@@ -96,6 +96,14 @@
CFLAGS+= -D_KERNEL
CFLAGS+= -DKLD_MODULE
+.if !defined(OPSYS)
+OPSYS!= uname -s
+.endif
+
+.if ${OPSYS} != "FreeBSD"
+CFLAGS+= -Ulinux -U__linux__ -D__FreeBSD__
+.endif
+
# Don't use any standard or source-relative include directories.
CSTD= c99
NOSTDINC= -nostdinc
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