kbuild: generate Module.symvers only when vmlinux exists

[linux-2.6-microblaze.git] / scripts / Makefile.modpost

diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index f54b6ac..3f5b09a 100644 (file)
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -41,7 +41,10 @@ PHONY := __modpost
 __modpost:
 
 include include/config/auto.conf
-include scripts/Kbuild.include
+include $(srctree)/scripts/Kbuild.include
+
+# for ld_flags
+include $(srctree)/scripts/Makefile.lib
 
 MODPOST = scripts/mod/modpost                                                          \
        $(if $(CONFIG_MODVERSIONS),-m)                                                  \
@@ -65,7 +68,20 @@ else
 ifeq ($(KBUILD_EXTMOD),)
 
 input-symdump := vmlinux.symvers
-output-symdump := Module.symvers
+output-symdump := modules-only.symvers
+
+quiet_cmd_cat = GEN     $@
+      cmd_cat = cat $(real-prereqs) > $@
+
+ifneq ($(wildcard vmlinux.symvers),)
+
+__modpost: Module.symvers
+Module.symvers: vmlinux.symvers modules-only.symvers FORCE
+       $(call if_changed,cat)
+
+targets += Module.symvers
+
+endif
 
 else
 
@@ -102,12 +118,30 @@ $(input-symdump):
        @echo >&2 'WARNING: Symbol version dump "$@" is missing.'
        @echo >&2 '         Modules may not have dependencies or modversions.'
 
+ifdef CONFIG_LTO_CLANG
+# With CONFIG_LTO_CLANG, .o files might be LLVM bitcode, so we need to run
+# LTO to compile them into native code before running modpost
+prelink-ext := .lto
+
+quiet_cmd_cc_lto_link_modules = LTO [M] $@
+cmd_cc_lto_link_modules =                                              \
+       $(LD) $(ld_flags) -r -o $@                                      \
+               $(shell [ -s $(@:.lto.o=.o.symversions) ] &&            \
+                       echo -T $(@:.lto.o=.o.symversions))             \
+               --whole-archive $^
+
+%.lto.o: %.o
+       $(call if_changed,cc_lto_link_modules)
+endif
+
+modules := $(sort $(shell cat $(MODORDER)))
+
 # Read out modules.order to pass in modpost.
 # Otherwise, allmodconfig would fail with "Argument list too long".
 quiet_cmd_modpost = MODPOST $@
-      cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T -
+      cmd_modpost = sed 's/\.ko$$/$(prelink-ext)\.o/' $< | $(MODPOST) -T -
 
-$(output-symdump): $(MODORDER) $(input-symdump) FORCE
+$(output-symdump): $(MODORDER) $(input-symdump) $(modules:.ko=$(prelink-ext).o) FORCE
        $(call if_changed,modpost)
 
 targets += $(output-symdump)