use externally built coreboot compilers

.circleci/config.yml

@@ -2,7 +2,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: ubuntu:16.04
+      - image: osresearch/heads-ubuntu:16.04
     steps:
       - run:
           name: Install dependencies
@@ -36,25 +36,25 @@ jobs:
       - run:
           name: Bootstrap make
           command: |
-            make bootstrap
+            make -j4 bootstrap
 
       - run:
-          name: Bootstrap musl
+          name: Bootstrap coreboot-gcc
           command: |
             ./build/make-4.2.1/make \
-                -j4 \
+		TOOLCHAIN=/home/builder/heads \
                 V=1 \
                 BOARD=qemu-coreboot \
-                musl-cross
+                coreboot-gcc
 
 
       - run:
           name: qemu-coreboot
           command: |
             ./build/make-4.2.1/make \
-                TERM=dumb \
-                -j4 \
+		TOOLCHAIN=/home/builder/heads \
                 V=1 \
+                -j4 \
                 BOARD=qemu-coreboot \
 
       - store-artifacts:
@@ -67,8 +67,9 @@ jobs:
           name: qemu-linuxboot
           command: |
             ./build/make-4.2.1/make \
-                -j4 \
+		TOOLCHAIN=/home/builder/heads \
                 V=1 \
+		-j4 \
                 BOARD=qemu-linuxboot \
 
       - store-artifacts:
@@ -81,6 +82,7 @@ jobs:
           name: x230
           command: |
             ./build/make-4.2.1/make \
+		TOOLCHAIN=/home/builder/heads \
                 -j4 \
                 V=1 \
                 BOARD=x230 \

modules/coreboot

@@ -39,14 +39,33 @@ coreboot_target := \
 coreboot_output := coreboot.rom
 coreboot_depend += linux initrd
 
+COREBOOT_XGCC_REL := $(coreboot_base_dir)/util/crossgcc/xgcc
+COREBOOT_XGCC_PATH := $(build)/$(COREBOOT_XGCC_REL)
+COREBOOT_XGCC := $(COREBOOT_XGCC_PATH)/bin/i386-elf-gcc
+
 # hack to force a build dependency on the cross compiler
-coreboot-gcc: $(build)/$(coreboot_base_dir)/util/crossgcc/xgcc/bin/i386-elf-gcc
-$(build)/$(coreboot_dir)/.configured: $(build)/$(coreboot_base_dir)/util/crossgcc/xgcc/bin/i386-elf-gcc
-$(build)/$(coreboot_base_dir)/util/crossgcc/xgcc/bin/i386-elf-gcc: $(build)/$(coreboot_base_dir)/.canary
+coreboot-gcc $(build)/$(coreboot_dir)/.configured: $(COREBOOT_XGCC)
+
+ifeq "$(TOOLCHAIN)" ""
+# Force a rebuild of the entire coreboot toolchain
+$(COREBOOT_XGCC): $(build)/$(coreboot_base_dir)/.canary
 	echo '******* Building crossgcc-i386 (this might take a while) ******'
 	$(MAKE) -C "$(build)/$(coreboot_base_dir)" CPUS=`nproc` crossgcc-i386
 	#echo '******* Building crossgcc-arm (this might take a while) ******'
 	#$(MAKE) -C "$(build)/$(coreboot_base_dir)" crossgcc-arm
+else
+# Use the pre-build one from the external toolchain build
+$(COREBOOT_XGCC):
+	if [ ! -e "$(TOOLCHAIN)/$(COREBOOT_XGCC_REL)" ]; then \
+		echo >&2 "ERROR: TOOLCHAIN=$(TOOLCHAIN) does not have coreboot" ; \
+		exit 1 ; \
+	fi
+	if [ ! -e "$(COREBOOT_XGCC_PATH)" ]; then \
+		ln -s \
+			"$(TOOLCHAIN)/build/$(coreboot_base_dir)/util/crossgcc/xgcc" \
+			"$(COREBOOT_XGCC_PATH)" ; \
+	fi
+endif
 
 # Force a rebuild if the inputs have changed
 $(build)/$(coreboot_dir)/.build: \