[kvm-unit-tests GIT PULL 11/18] s390x/Makefile: snippets: Add separate target for the ELF snippets

[Nico Boehr <nrb@linux.ibm.com>]

From: Marc Hartmayer <mhartmay@linux.ibm.com>

It's unusual to create multiple files in one target rule, and it's even more
unusual to create an ELF file with a `.gbin` file extension first, and then
overwrite it in the next step. It might even lead to errors as the input file
path is also used as the output file path - but this depends on the objcopy
implementation. Therefore, create an extra target for the ELF files and list it
as a prerequisite for the *.gbin targets.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20240604115932.86596-2-mhartmay@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
 s390x/Makefile | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/s390x/Makefile b/s390x/Makefile
index 4424877e..b3b2ae8c 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -160,14 +160,18 @@ $(SNIPPET_DIR)/c/%.o: SNIPPET_INCLUDE := $(SNIPPET_SRC_DIR)/lib
 $(SNIPPET_DIR)/c/%.o: $(SNIPPET_DIR)/c/%.c $(asm-offsets)
 	$(CC) $(CFLAGS) -c -nostdlib -o $@ $<
 
-$(SNIPPET_DIR)/asm/%.gbin: $(SNIPPET_DIR)/asm/%.o $(SNIPPET_DIR)/asm/flat.lds
+$(SNIPPET_DIR)/asm/%.elf: $(SNIPPET_DIR)/asm/%.o $(SNIPPET_DIR)/asm/flat.lds
 	$(CC) $(LDFLAGS) -o $@ -T $(SNIPPET_DIR)/asm/flat.lds $<
-	$(OBJCOPY) -O binary -j ".rodata" -j ".lowcore" -j ".text" -j ".data" -j ".bss" --set-section-flags .bss=alloc,load,contents $@ $@
+
+$(SNIPPET_DIR)/asm/%.gbin: $(SNIPPET_DIR)/asm/%.elf
+	$(OBJCOPY) -O binary -j ".rodata" -j ".lowcore" -j ".text" -j ".data" -j ".bss" --set-section-flags .bss=alloc,load,contents $< $@
 	truncate -s '%4096' $@
 
-$(SNIPPET_DIR)/c/%.gbin: $(SNIPPET_DIR)/c/%.o $(snippet_lib) $(FLATLIBS) $(SNIPPET_DIR)/c/flat.lds
+$(SNIPPET_DIR)/c/%.elf: $(SNIPPET_DIR)/c/%.o $(snippet_lib) $(FLATLIBS) $(SNIPPET_DIR)/c/flat.lds
 	$(CC) $(LDFLAGS) -o $@ -T $(SNIPPET_DIR)/c/flat.lds $< $(snippet_lib) $(FLATLIBS)
-	$(OBJCOPY) -O binary -j ".rodata" -j ".lowcore" -j ".text" -j ".data" -j ".bss" --set-section-flags .bss=alloc,load,contents $@ $@
+
+$(SNIPPET_DIR)/c/%.gbin: $(SNIPPET_DIR)/c/%.elf
+	$(OBJCOPY) -O binary -j ".rodata" -j ".lowcore" -j ".text" -j ".data" -j ".bss" --set-section-flags .bss=alloc,load,contents $< $@
 	truncate -s '%4096' $@
 
 %.hdr: %.gbin $(HOST_KEY_DOCUMENT)
-- 
2.47.1