[PATCH bpf-next] selftests/bpf: fix selection of static vs. dynamic LLVM

[Anton Protopopov <aspsk@isovalent.com>]

The Makefile uses the exit code of the `llvm-config --link-static --libs`
command to choose between statically-linked and dynamically-linked LLVMs.
The stdout and stderr of that command are redirected to /dev/null.
To redirect the output the "&>" construction is used, which might not be
supported by /bin/sh, which is executed by make for $(shell ...) commands.
On such systems the test will fail even if static LLVM is actually
supported. Replace "&>" by ">/dev/null 2>&1" to fix this.

Fixes: 2a9d30fac818 ("selftests/bpf: Support dynamically linking LLVM if static is not available")
Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
---
 tools/testing/selftests/bpf/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index 739305064839..ca41d47d4ba6 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -180,7 +180,7 @@ ifeq ($(feature-llvm),1)
   # both llvm-config and lib.mk add -D_GNU_SOURCE, which ends up as conflict
   LLVM_CFLAGS  += $(filter-out -D_GNU_SOURCE,$(shell $(LLVM_CONFIG) --cflags))
   # Prefer linking statically if it's available, otherwise fallback to shared
-  ifeq ($(shell $(LLVM_CONFIG) --link-static --libs &> /dev/null && echo static),static)
+  ifeq ($(shell $(LLVM_CONFIG) --link-static --libs >/dev/null 2>&1 && echo static),static)
     LLVM_LDLIBS  += $(shell $(LLVM_CONFIG) --link-static --libs $(LLVM_CONFIG_LIB_COMPONENTS))
     LLVM_LDLIBS  += $(shell $(LLVM_CONFIG) --link-static --system-libs $(LLVM_CONFIG_LIB_COMPONENTS))
     LLVM_LDLIBS  += -lstdc++
-- 
2.34.1