[CRIU] [PATCH] build: nmk -- Filter out -Wl flags from linking builtin targets

[Cyrill Gorcunov]

Tycho reported that Debian uses custom LDFLAGS to
build criu, this flag get propagated into built-in
targets where we use $(LD) instead causing build
procedure to interrupt

|  LINK     arch/x86/syscalls.built-in.o
| ld: unrecognized option '-Wl,-Bsymbolic-functions'
| ld: use the --help option for usage information
| /«PKGBUILDDIR»/scripts/nmk/scripts/build.mk:141: recipe for target 'arch/x86/syscalls.built-in.o' failed

Lets make maintainers life easier and filter
out the flags we know never accepted by $(LD).

Reported-by: Tycho Andersen <tycho.andersen at canonical.com>
Tested-by: Tycho Andersen <tycho.andersen at canonical.com>
Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 scripts/nmk/scripts/build.mk | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scripts/nmk/scripts/build.mk b/scripts/nmk/scripts/build.mk
index bd409441293e..87da2d97aee4 100644
--- a/scripts/nmk/scripts/build.mk
+++ b/scripts/nmk/scripts/build.mk
@@ -25,6 +25,15 @@ ifndef obj
 endif
 
 #
+# Filter out any -Wl,XXX option: some of build farms
+# assumes that we're using $(CC) for building built-in
+# targets (and they have all rights to). But we're
+# using $(LD) directly instead so filter out -Wl
+# flags to make maintainer's life easier.
+LDFLAGS-MASK	:= -Wl,%
+LDFLAGS		:= $(filter-out $(LDFLAGS-MASK),$(LDFLAGS))
+
+#
 # Accumulate common flags.
 define nmk-ccflags
         $(CFLAGS) $(ccflags-y) $(CFLAGS_$(@F))
-- 
2.7.4