target/sdk: use .config instead of unconditionally enabling all build dirs

[openwrt.git] / include / toplevel.mk

diff --git a/include/toplevel.mk b/include/toplevel.mk
index a623be9..10b8104 100644 (file)
--- a/include/toplevel.mk
+++ b/include/toplevel.mk
@@ -43,6 +43,13 @@ unexport LPATH
 # make sure that a predefined CFLAGS variable does not disturb packages
 export CFLAGS=
 
+ifneq ($(shell $(HOSTCC) 2>&1 | grep clang),)
+  export HOSTCC_REAL?=$(HOSTCC)
+  export HOSTCC_WRAPPER:=$(TOPDIR)/scripts/clang-gcc-wrapper
+else
+  export HOSTCC_WRAPPER:=$(HOSTCC)
+endif
+
 ifeq ($(FORCE),)
   .config scripts/config/conf scripts/config/mconf: tmp/.prereq-build
 endif
@@ -74,12 +81,12 @@ prepare-tmpinfo: FORCE
        fi
 
 scripts/config/mconf:
-       @$(_SINGLE)$(SUBMAKE) -s -C scripts/config all CC="$(HOSTCC)"
+       @$(_SINGLE)$(SUBMAKE) -s -C scripts/config all CC="$(HOSTCC_WRAPPER)"
 
 $(eval $(call rdep,scripts/config,scripts/config/mconf))
 
 scripts/config/conf:
-       @$(_SINGLE)$(SUBMAKE) -s -C scripts/config conf CC="$(HOSTCC)"
+       @$(_SINGLE)$(SUBMAKE) -s -C scripts/config conf CC="$(HOSTCC_WRAPPER)"
 
 config: scripts/config/conf prepare-tmpinfo FORCE
        $< Config.in
@@ -149,6 +156,15 @@ prereq:: prepare-tmpinfo .config
        @+$(MAKE) -r -s tmp/.prereq-build $(PREP_MK)
        @+$(NO_TRACE_MAKE) -r -s $@
 
+ifeq ($(SDK),1)
+
+%::
+       @+$(PREP_MK) $(NO_TRACE_MAKE) -r -s prereq
+       @./scripts/config/conf --defconfig=.config Config.in
+       @+$(ULIMIT_FIX) $(SUBMAKE) -r $@
+
+else
+
 %::
        @+$(PREP_MK) $(NO_TRACE_MAKE) -r -s prereq
        @( \
@@ -160,6 +176,8 @@ prereq:: prepare-tmpinfo .config
        )
        @+$(ULIMIT_FIX) $(SUBMAKE) -r $@
 
+endif
+
 help:
        cat README