build: generate config.h in the top-make

So, we need CONFIG_HAS_* feature-defines in compel, libsoccr
tools. Let's move this tests upper.

It also reverts commit 411cde8815a4 ("make, soccr: let CRIU depend on
libsoccr"), as we don't need -lsoccr to build feature tests now.
To eliminate any races here, I added $(LIB_FEATURES).

Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Makefile

@@ -177,6 +177,23 @@ endif
 	$(Q) echo "#define CRIU_GITID \"$(GITID)\""				>> $@
 	$(Q) echo "#endif /* __CR_VERSION_H__ */"				>> $@
 
+#
+# piegen tool might be disabled by hands. Don't use it until
+# you know what you're doing.
+ifneq ($(filter ia32 x86 ppc64,$(ARCH)),)
+        ifneq ($(PIEGEN),no)
+                piegen-y := y
+                export piegen-y
+        endif
+endif
+
+#
+# Configure variables.
+export CONFIG_HEADER := $(SRC_DIR)/criu/include/config.h
+ifeq ($(filter clean mrproper,$(MAKECMDGOALS)),)
+include $(SRC_DIR)/Makefile.config
+endif
+
 #
 # Protobuf images first, they are not depending
 # on anything else.
@@ -224,6 +241,7 @@ clean: subclean
 mrproper: subclean
 	$(Q) $(MAKE) $(build)=images $@
 	$(Q) $(MAKE) $(build)=criu $@
+	$(Q) $(RM) $(CONFIG_HEADER)
 	$(Q) $(RM) $(VERSION_HEADER)
 	$(Q) $(RM) cscope.*
 	$(Q) $(RM) tags TAGS

Makefile.config

@@ -3,15 +3,17 @@ include $(__nmk_dir)msg.mk
 include $(SRC_DIR)/scripts/feature-tests.mak
 
 ifeq ($(call try-cc,$(FEATURE_TEST_LIBBSD_DEV),-lbsd),true)
-        LIBS		+= -lbsd
+        LIBS_FEATURES	+= -lbsd
         FEATURE_DEFINES	+= -DCONFIG_HAS_LIBBSD
 endif
 
 ifeq ($(call pkg-config-check,libselinux),y)
-        LIBS		+= -lselinux
+        LIBS_FEATURES	+= -lselinux
         FEATURE_DEFINES	+= -DCONFIG_HAS_SELINUX
 endif
 
+export LIBS += $(LIBS_FEATURES)
+
 export DEFINES += $(FEATURE_DEFINES)
 export CFLAGS += $(FEATURE_DEFINES)
 
@@ -20,17 +22,19 @@ FEATURES_LIST	:= TCP_REPAIR STRLCPY STRLCAT PTRACE_PEEKSIGINFO \
 
 # $1 - config name
 define gen-feature-test
-ifeq ($$(call try-cc,$$(FEATURE_TEST_$(1)),$$(LIBS),$$(DEFINES)),true)
+ifeq ($$(call try-cc,$$(FEATURE_TEST_$(1)),$$(LIBS_FEATURES),$$(DEFINES)),true)
 	$(Q) @echo '#define CONFIG_HAS_$(1)' >> $$@
 	$(Q) @echo '' >> $$@
 endif
 endef
 
-$(obj)/include/config-base.h:
+CONFIG_BASE := $(SRC_DIR)/criu/include/config-base.h
+
+$(CONFIG_BASE):
 	@true
 
 define config-header-rule
-$(CONFIG_HEADER): $(obj)/include/config-base.h
+$(CONFIG_HEADER): $(CONFIG_BASE)
 	$$(call msg-gen, $$@)
 	$(Q) @echo '#ifndef __CR_CONFIG_H__'				> $$@
 	$(Q) @echo '#define __CR_CONFIG_H__'				>> $$@

criu/Makefile

@@ -25,16 +25,6 @@ ifeq ($(GMON),1)
 	GMONLDOPT	:= -pg
 endif
 
-#
-# piegen tool might be disabled by hands. Don't use it until
-# you know what you're doing.
-ifneq ($(filter ia32 x86 ppc64,$(ARCH)),)
-        ifneq ($(PIEGEN),no)
-                piegen-y := y
-                export piegen-y
-        endif
-endif
-
 # msg-* printing
 include $(__nmk_dir)msg.mk
 
@@ -42,17 +32,10 @@ include $(__nmk_dir)msg.mk
 # Needed libraries checks
 include $(SRC_DIR)/criu/Makefile.packages
 
-#
-# Configure variables.
-CONFIG_HEADER := $(obj)/include/config.h
-ifneq ($(filter-out clean mrproper,$(MAKECMDGOALS)),)
-include $(SRC_DIR)/criu/Makefile.config
-endif
-
 #
 # System calls library.
 SYSCALL-LIB		:= $(ARCH_DIR)/syscalls.built-in.o
-syscalls_lib: $(CONFIG_HEADER)
+syscalls_lib:
 	$(Q) $(MAKE) $(call build-as,Makefile.syscalls,$(ARCH_DIR)) all
 .PHONY: syscalls_lib
 
@@ -136,7 +119,6 @@ subproper:
 	$(Q) $(MAKE) $(build)=$(PIE_DIR) mrproper
 	$(Q) $(MAKE) $(build)=$(PIE_DIR)/piegen mrproper
 .PHONY: subproper
-mrproper-y     += $(CONFIG_HEADER)
 mrproper: subproper
 
 UAPI_HEADERS := $(SRC_DIR)/criu/include/criu-plugin.h

criu/Makefile.packages

@@ -19,7 +19,7 @@ REQ-DEB-PKG-NAMES	+= libcap-dev
 
 REQ-DEB-PKG-TEST-NAMES  += libaio-dev
 
-export LIBS		:= -lrt -lpthread -lprotobuf-c -ldl -lnl-3
+export LIBS		+= -lrt -lpthread -lprotobuf-c -ldl -lnl-3
 
 check-packages-failed:
 	$(warning Can not find some of the required libraries)