[PATCH 1/2] build: work around secondary expansion limitation with some Make versions

[Nicholas Piggin]

GNU Make 4.2.1 as shipped in Ubuntu 20.04 has a problem with secondary
expansion and variable names containing the '/' character. Make 4.3 and
4.4 don't have the problem.

Instead of using the variable name from riscv/sbi-deps and matching it
from the riscv/sbi.* target name, name the variable sbi-deps and match
it by stripping the riscv/ directory name off the riscv/sbi.* target
name.

Reported-by: Joel Stanley <joel at jms.id.au>
Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
 riscv/Makefile | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/riscv/Makefile b/riscv/Makefile
index beaeaefa..64720c38 100644
--- a/riscv/Makefile
+++ b/riscv/Makefile
@@ -18,12 +18,12 @@ tests += $(TEST_DIR)/isa-dbltrp.$(exe)
 
 all: $(tests)
 
-$(TEST_DIR)/sbi-deps += $(TEST_DIR)/sbi-asm.o
-$(TEST_DIR)/sbi-deps += $(TEST_DIR)/sbi-dbtr.o
-$(TEST_DIR)/sbi-deps += $(TEST_DIR)/sbi-fwft.o
-$(TEST_DIR)/sbi-deps += $(TEST_DIR)/sbi-sse.o
+sbi-deps += $(TEST_DIR)/sbi-asm.o
+sbi-deps += $(TEST_DIR)/sbi-dbtr.o
+sbi-deps += $(TEST_DIR)/sbi-fwft.o
+sbi-deps += $(TEST_DIR)/sbi-sse.o
 
-all_deps += $($(TEST_DIR)/sbi-deps)
+all_deps += $(sbi-deps)
 
 # When built for EFI sieve needs extra memory, run with e.g. '-m 256' on QEMU
 $(TEST_DIR)/sieve.$(exe): AUXFLAGS = 0x1
@@ -113,7 +113,7 @@ cflatobjs += lib/efi.o
 .PRECIOUS: %.so
 
 %.so: EFI_LDFLAGS += -defsym=EFI_SUBSYSTEM=0xa --no-undefined
-%.so: %.o $(FLATLIBS) $(SRCDIR)/riscv/efi/elf_riscv64_efi.lds $(cstart.o) %.aux.o $$($$*-deps)
+%.so: %.o $(FLATLIBS) $(SRCDIR)/riscv/efi/elf_riscv64_efi.lds $(cstart.o) %.aux.o $$($$(notdir $$*)-deps)
 	$(LD) $(EFI_LDFLAGS) -o $@ -T $(SRCDIR)/riscv/efi/elf_riscv64_efi.lds \
 		$(filter %.o, $^) $(FLATLIBS) $(EFI_LIBS)
 
@@ -129,7 +129,7 @@ cflatobjs += lib/efi.o
 		-O binary $^ $@
 else
 %.elf: LDFLAGS += -pie -n -z notext
-%.elf: %.o $(FLATLIBS) $(SRCDIR)/riscv/flat.lds $(cstart.o) %.aux.o $$($$*-deps)
+%.elf: %.o $(FLATLIBS) $(SRCDIR)/riscv/flat.lds $(cstart.o) %.aux.o $$($$(notdir $$*)-deps)
 	$(LD) $(LDFLAGS) -o $@ -T $(SRCDIR)/riscv/flat.lds \
 		$(filter %.o, $^) $(FLATLIBS)
 	@chmod a-x $@
-- 
2.51.0