[PATCH v3 3/6] kbuild: generate a linker map for vmlinux.o

[Kris Van Hees]

When CONFIG_BUILTIN_MODULE_RANGES is set, a linker map for vmlinux.o needs
to be generated.  The generation of offset range data for builtin modules
depends on that linker map to know what offsets in an ELF section belong
to an object file for a particular builtin module.

Signed-off-by: Kris Van Hees <kris.van.hees@xxxxxxxxxx>
Reviewed-by: Nick Alcock <nick.alcock@xxxxxxxxxx>
---
 scripts/Makefile.vmlinux_o | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/scripts/Makefile.vmlinux_o b/scripts/Makefile.vmlinux_o
index 6de297916ce68..252505505e0e3 100644
--- a/scripts/Makefile.vmlinux_o
+++ b/scripts/Makefile.vmlinux_o
@@ -45,9 +45,12 @@ objtool-args = $(vmlinux-objtool-args-y) --link
 # Link of vmlinux.o used for section mismatch analysis
 # ---------------------------------------------------------------------------
 
+vmlinux-o-ld-args-$(CONFIG_BUILTIN_MODULE_RANGES)	+= -Map=$@.map
+
 quiet_cmd_ld_vmlinux.o = LD      $@
       cmd_ld_vmlinux.o = \
 	$(LD) ${KBUILD_LDFLAGS} -r -o $@ \
+	$(vmlinux-o-ld-args-y) \
 	$(addprefix -T , $(initcalls-lds)) \
 	--whole-archive vmlinux.a --no-whole-archive \
 	--start-group $(KBUILD_VMLINUX_LIBS) --end-group \
-- 
2.43.0