cmake: include external toolchain directory in CMAKE_FIND_ROOT_PATH (fixes #19074)

Signed-off-by: Felix Fietkau <[email protected]>

SVN-Revision: 44825

include/cmake.mk

@@ -31,6 +31,8 @@ CMAKE_AR:=$(call cmake_tool,$(TARGET_AR))
 CMAKE_NM:=$(call cmake_tool,$(TARGET_NM))
 CMAKE_RANLIB:=$(call cmake_tool,$(TARGET_RANLIB))
 
+CMAKE_FIND_ROOT_PATH:=$(STAGING_DIR);$(TOOLCHAIN_DIR)$(if $(CONFIG_EXTERNAL_TOOLCHAIN),;$(CONFIG_TOOLCHAIN_ROOT))
+
 define Build/Configure/Default
 	(cd $(PKG_BUILD_DIR); \
 		CFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS)" \
@@ -53,7 +55,7 @@ define Build/Configure/Default
 			-DCMAKE_AR="$(CMAKE_AR)" \
 			-DCMAKE_NM="$(CMAKE_NM)" \
 			-DCMAKE_RANLIB="$(CMAKE_RANLIB)" \
-			-DCMAKE_FIND_ROOT_PATH="$(STAGING_DIR);$(TOOLCHAIN_DIR)" \
+			-DCMAKE_FIND_ROOT_PATH="$(CMAKE_FIND_ROOT_PATH)" \
 			-DCMAKE_FIND_ROOT_PATH_MODE_PROGRAM=BOTH \
 			-DCMAKE_FIND_ROOT_PATH_MODE_LIBRARY=ONLY \
 			-DCMAKE_FIND_ROOT_PATH_MODE_INCLUDE=ONLY \