bpf: Compile resolve_btfids tool at kernel compilation start

[linux-2.6-microblaze.git] / Makefile

diff --git a/Makefile b/Makefile
index ae5d822..017e775 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@
 VERSION = 5
 PATCHLEVEL = 8
 SUBLEVEL = 0
-EXTRAVERSION = -rc1
+EXTRAVERSION = -rc2
 NAME = Kleptomaniac Octopus
 
 # *DOCUMENTATION*
@@ -828,7 +828,7 @@ endif
 
 ifdef CONFIG_DEBUG_INFO_COMPRESSED
 DEBUG_CFLAGS   += -gz=zlib
-KBUILD_AFLAGS  += -Wa,--compress-debug-sections=zlib
+KBUILD_AFLAGS  += -gz=zlib
 KBUILD_LDFLAGS += --compress-debug-sections=zlib
 endif
 
@@ -1053,9 +1053,10 @@ export mod_sign_cmd
 
 HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
 
+has_libelf = $(call try-run,\
+               echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
+
 ifdef CONFIG_STACK_VALIDATION
-  has_libelf := $(call try-run,\
-               echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
   ifeq ($(has_libelf),1)
     objtool_target := tools/objtool FORCE
   else
@@ -1064,6 +1065,14 @@ ifdef CONFIG_STACK_VALIDATION
   endif
 endif
 
+ifdef CONFIG_DEBUG_INFO_BTF
+  ifeq ($(has_libelf),1)
+    resolve_btfids_target := tools/bpf/resolve_btfids FORCE
+  else
+    ERROR_RESOLVE_BTFIDS := 1
+  endif
+endif
+
 PHONY += prepare0
 
 export MODORDER := $(extmod-prefix)modules.order
@@ -1175,7 +1184,7 @@ prepare0: archprepare
        $(Q)$(MAKE) $(build)=.
 
 # All the preparing..
-prepare: prepare0 prepare-objtool
+prepare: prepare0 prepare-objtool prepare-resolve_btfids
 
 # Support for using generic headers in asm-generic
 asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
@@ -1188,7 +1197,7 @@ uapi-asm-generic:
        $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
        generic=include/uapi/asm-generic
 
-PHONY += prepare-objtool
+PHONY += prepare-objtool prepare-resolve_btfids
 prepare-objtool: $(objtool_target)
 ifeq ($(SKIP_STACK_VALIDATION),1)
 ifdef CONFIG_UNWINDER_ORC
@@ -1199,6 +1208,11 @@ else
 endif
 endif
 
+prepare-resolve_btfids: $(resolve_btfids_target)
+ifeq ($(ERROR_RESOLVE_BTFIDS),1)
+       @echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
+       @false
+endif
 # Generate some files
 # ---------------------------------------------------------------------------
 
@@ -1336,16 +1350,6 @@ dt_binding_check: scripts_dtc
 # ---------------------------------------------------------------------------
 # Modules
 
-# install modules.builtin regardless of CONFIG_MODULES
-PHONY += _builtin_inst_
-_builtin_inst_:
-       @mkdir -p $(MODLIB)/
-       @cp -f modules.builtin $(MODLIB)/
-       @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
-
-PHONY += install
-install: _builtin_inst_
-
 ifdef CONFIG_MODULES
 
 # By default, build modules as well
@@ -1389,7 +1393,7 @@ PHONY += modules_install
 modules_install: _modinst_ _modinst_post
 
 PHONY += _modinst_
-_modinst_: _builtin_inst_
+_modinst_:
        @rm -rf $(MODLIB)/kernel
        @rm -f $(MODLIB)/source
        @mkdir -p $(MODLIB)/kernel
@@ -1399,6 +1403,8 @@ _modinst_: _builtin_inst_
                ln -s $(CURDIR) $(MODLIB)/build ; \
        fi
        @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
+       @cp -f modules.builtin $(MODLIB)/
+       @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
 
 # This depmod is only for convenience to give the initial