toolchain: move makefile includes

Including a bunch of Makefiles with wildcard makes it impossible to add
new toolchain backends. Avoid that by namely including needed files.

The external toolchain still needs to include all the toolchain/*/*.mk
sub-makefiles, as they are needed to build a toolchain that runs on the
target. It is to be noted that the cross-toolchain is not built in this
case, as the make-targets to build the cross-toolchain are not present
in the $(BASE_TARGETS) variable, which is later used to create the
dependency rules.

Also, the comment 'Explicit ordering' has been removed, as it is mis-
leading. It is make's responsibility to create the proper ordering based
on the dependency rules it finds in the Makefiles

Signed-off-by: Yann E. MORIN <yann.morin.1998@anciens.enib.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

Makefile

@@ -294,21 +294,9 @@ all: world
 # each selected package to TARGETS if that package was selected
 # in the .config file.
 ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
-# avoid pulling in external toolchain which is broken for toplvl parallel builds
-# Explicit ordering:
-include toolchain/dependencies/dependencies.mk
-include toolchain/binutils/binutils.mk
-include toolchain/ccache/ccache.mk
-include toolchain/elf2flt/elf2flt.mk
-include toolchain/gcc/gcc-uclibc-4.x.mk
-include toolchain/gdb/gdb.mk
-include toolchain/kernel-headers/kernel-headers.mk
-include toolchain/mklibs/mklibs.mk
-include toolchain/sstrip/sstrip.mk
-include toolchain/uClibc/uclibc.mk
+include toolchain/toolchain-buildroot.mk
 else ifeq ($(BR2_TOOLCHAIN_EXTERNAL),y)
-include toolchain/helpers.mk
-include toolchain/*/*.mk
+include toolchain/toolchain-external.mk
 endif
 
 include package/*/*.mk

toolchain/toolchain-buildroot.mk

@@ -0,0 +1,12 @@
+# Include files required for the internal toolchain backend
+
+include toolchain/dependencies/dependencies.mk
+include toolchain/binutils/binutils.mk
+include toolchain/ccache/ccache.mk
+include toolchain/elf2flt/elf2flt.mk
+include toolchain/gcc/gcc-uclibc-4.x.mk
+include toolchain/gdb/gdb.mk
+include toolchain/kernel-headers/kernel-headers.mk
+include toolchain/mklibs/mklibs.mk
+include toolchain/sstrip/sstrip.mk
+include toolchain/uClibc/uclibc.mk

toolchain/toolchain-external.mk

@@ -0,0 +1,14 @@
+# Required includes for the external toolchain backend
+
+include toolchain/helpers.mk
+include toolchain/binutils/binutils.mk
+include toolchain/ccache/ccache.mk
+include toolchain/dependencies/dependencies.mk
+include toolchain/elf2flt/elf2flt.mk
+include toolchain/gcc/gcc-uclibc-4.x.mk
+include toolchain/gdb/gdb.mk
+include toolchain/kernel-headers/kernel-headers.mk
+include toolchain/mklibs/mklibs.mk
+include toolchain/sstrip/sstrip.mk
+include toolchain/toolchain-external/ext-tool.mk
+include toolchain/uClibc/uclibc.mk