From: H. Nikolaus Schaller hns@goldelico.com
[ Upstream commit 28bbbb9875a35975904e46f9b06fa689d051b290 ]
When cross compiling a MIPS kernel on a BSD based HOSTCC leads to errors like
SYNC include/config/auto.conf.cmd - due to: .config egrep: empty (sub)expression UPD include/config/kernel.release HOSTCC scripts/dtc/dtc.o - due to target missing
It turns out that egrep uses this egrep pattern:
(|MINOR_|PATCHLEVEL_)
This is not valid syntax or gives undefined results according to POSIX 9.5.3 ERE Grammar
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap09.html
It seems to be silently accepted by the Linux egrep implementation while a BSD host complains.
Such patterns can be replaced by a transformation like
"(|p1|p2)" -> "(p1|p2)?"
Fixes: 48c35b2d245f ("[MIPS] There is no __GNUC_MAJOR__") Signed-off-by: H. Nikolaus Schaller hns@goldelico.com Signed-off-by: Masahiro Yamada masahiroy@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/mips/Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/mips/Makefile b/arch/mips/Makefile index 25f3bfef9b39..af4eff7d22ec 100644 --- a/arch/mips/Makefile +++ b/arch/mips/Makefile @@ -286,7 +286,7 @@ LDFLAGS += -m $(ld-emul)
ifdef CONFIG_MIPS CHECKFLAGS += $(shell $(CC) $(KBUILD_CFLAGS) -dM -E -x c /dev/null | \ - egrep -vw '__GNUC_(|MINOR_|PATCHLEVEL_)_' | \ + egrep -vw '__GNUC_(MINOR_|PATCHLEVEL_)?_' | \ sed -e "s/^#define /-D'/" -e "s/ /'='/" -e "s/$$/'/" -e 's/$$/&&/g') ifdef CONFIG_64BIT CHECKFLAGS += -m64