[kvm-unit-tests GIT PULL v2 05/14] s390x: use preprocessor for linker script generation

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

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

The old `.lds` scripts are being renamed to `.lds.S` and the actual
`.lds` scripts are being generated by the assembler preprocessor. This
change allows us to use constants defined by macros in the `.lds.S`
files.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Link: https://lore.kernel.org/r/20230307091051.13945-6-mhartmay@linux.ibm.com
Signed-off-by: Nico Boehr <nrb@linux.ibm.com>
---
 s390x/Makefile                              | 7 +++++--
 s390x/{flat.lds => flat.lds.S}              | 0
 s390x/snippets/asm/{flat.lds => flat.lds.S} | 0
 s390x/snippets/c/{flat.lds => flat.lds.S}   | 0
 .gitignore                                  | 1 +
 5 files changed, 6 insertions(+), 2 deletions(-)
 rename s390x/{flat.lds => flat.lds.S} (100%)
 rename s390x/snippets/asm/{flat.lds => flat.lds.S} (100%)
 rename s390x/snippets/c/{flat.lds => flat.lds.S} (100%)

diff --git a/s390x/Makefile b/s390x/Makefile
index 50171f3..6732b48 100644
--- a/s390x/Makefile
+++ b/s390x/Makefile
@@ -78,7 +78,7 @@ CFLAGS += -fno-delete-null-pointer-checks
 LDFLAGS += -nostdlib -Wl,--build-id=none
 
 # We want to keep intermediate files
-.PRECIOUS: %.o
+.PRECIOUS: %.o %.lds
 
 asm-offsets = lib/$(ARCH)/asm-offsets.h
 include $(SRCDIR)/scripts/asm-offsets.mak
@@ -161,6 +161,9 @@ $(SNIPPET_DIR)/c/%.gbin: $(SNIPPET_DIR)/c/%.o $(snippet_lib) $(FLATLIBS) $(SNIPP
 %.hdr.obj: %.hdr
 	$(OBJCOPY) -I binary -O elf64-s390 -B "s390:64-bit" $< $@
 
+lds-autodepend-flags = -MMD -MF $(dir $*).$(notdir $*).d -MT $@
+%.lds: %.lds.S
+	$(CPP) $(lds-autodepend-flags) $(CPPFLAGS) -P -C -o $@ $<
 
 .SECONDEXPANSION:
 %.elf: $(FLATLIBS) $(asmlib) $(SRCDIR)/s390x/flat.lds $$(snippets-obj) $$(snippet-hdr-obj) %.o
@@ -213,7 +216,7 @@ $(snippet_asmlib): $$(patsubst %.o,%.S,$$@) $(asm-offsets)
 
 
 arch_clean: asm_offsets_clean
-	$(RM) $(TEST_DIR)/*.{o,elf,bin} $(SNIPPET_DIR)/*/*.{o,elf,*bin,*obj,hdr} $(SNIPPET_DIR)/asm/.*.d $(TEST_DIR)/.*.d lib/s390x/.*.d $(comm-key)
+	$(RM) $(TEST_DIR)/*.{o,elf,bin,lds} $(SNIPPET_DIR)/*/*.{o,elf,*bin,*obj,hdr,lds} $(SNIPPET_DIR)/asm/.*.d $(TEST_DIR)/.*.d lib/s390x/.*.d $(comm-key)
 
 generated-files = $(asm-offsets)
 $(tests:.elf=.o) $(asmlib) $(cflatobjs): $(generated-files)
diff --git a/s390x/flat.lds b/s390x/flat.lds.S
similarity index 100%
rename from s390x/flat.lds
rename to s390x/flat.lds.S
diff --git a/s390x/snippets/asm/flat.lds b/s390x/snippets/asm/flat.lds.S
similarity index 100%
rename from s390x/snippets/asm/flat.lds
rename to s390x/snippets/asm/flat.lds.S
diff --git a/s390x/snippets/c/flat.lds b/s390x/snippets/c/flat.lds.S
similarity index 100%
rename from s390x/snippets/c/flat.lds
rename to s390x/snippets/c/flat.lds.S
diff --git a/.gitignore b/.gitignore
index 601822d..29f352c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,3 +31,4 @@ cscope.*
 /s390x/comm.key
 /s390x/snippets/*/*.hdr
 /s390x/snippets/*/*.*obj
+/s390x/**/*.lds
-- 
2.39.2