util/testing: Allow jenkins builders to skip testing areas

With the addition of the clang tests, the jenkins builds are taking a
really long time to run the tests.  This change allows the
"what-jenkins-does" build to be split into separate builds on jenkins.

Additionally, some jenkins builds like coverity don't need (or want)
to build clang or even the linters.

Update help with the variables.

Signed-off-by: Martin Roth <gaumless@gmail.com>
Change-Id: I0f8ac68c1bc8f8ff9be62d80db850355e742ee74
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69495
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/util/testing/Makefile.inc b/util/testing/Makefile.inc
index ea35851..7cf2c8d 100644
--- a/util/testing/Makefile.inc
+++ b/util/testing/Makefile.inc
@@ -2,14 +2,16 @@
 
 test-help help::
 	@echo  '*** coreboot test targets ***'
-	@echo  '  what-jenkins-does      - Run platform build tests with junit output'
-	@echo  '  lint / lint-stable     - run coreboot lint tools (all / minimal)'
-	@echo  '  test-basic             - Run stardard build tests. All expected to pass.'
-	@echo  '  test-lint              - basic: Run stable and extended lint tests.'
-	@echo  '  test-tools             - basic: Tests a basic list of tools.'
-	@echo  '  test-abuild            - basic: Builds all platforms'
-	@echo  '  test-payloads          - basic: Builds internal payloads'
-	@echo  '  test-cleanup           - basic: Cleans coreboot directories'
+	@echo  '  what-jenkins-does    - Run platform build tests with junit output'
+	@echo  '                         Skip tests by setting env vars JENKINS_SKIP_x_TESTS'
+	@echo  '                         to 'y' where x is: CLANG, GCC, LINT, TOOL, or UNIT'
+	@echo  '  lint / lint-stable   - Run coreboot lint tools (all / minimal)'
+	@echo  '  test-basic           - Run standard build tests. All expected to pass.'
+	@echo  '  test-lint            - Basic: Run stable and extended lint tests.'
+	@echo  '  test-tools           - Basic: Tests a basic list of tools.'
+	@echo  '  test-abuild          - Basic: Builds all platforms'
+	@echo  '  test-payloads        - Basic: Builds internal payloads'
+	@echo  '  test-cleanup         - Basic: Cleans coreboot directories'
 	@echo
 
 # junit.xml is a helper target to wrap builds that don't create junit.xml output
@@ -95,12 +97,16 @@
 	cd 3rdparty/intel-sec-tools/ ; go mod vendor
 	cd util/goswid ; go mod vendor
 	$(MAKE) test-abuild
+ifneq  ($(JENKINS_SKIP_TOOL_TESTS),y)
 	$(MAKE) test-tools
+endif
+ifneq  ($(JENKINS_SKIP_UNIT_TESTS),y)
 	+$(MAKE) junit.xml-unit-tests COV=1
 	+(cd payloads/libpayload; unset COREBOOT_BUILD_DIR; $(MAKE) junit.xml-unit-tests COV=1)
 	+(cd payloads/libpayload; unset COREBOOT_BUILD_DIR; $(MAKE) coverage-report COV=1)
 	+$(MAKE) coverage-report JUNIT_OUTPUT=y COV=1
 	find . -name 'tests.info' -exec cat {} + >$(COREBOOT_BUILD_DIR)/coverage.info
+endif
 
 test-basic: test-lint test-tools test-abuild test-payloads test-cleanup
 
@@ -110,10 +116,14 @@
 
 test-abuild:
 	NAME=scanbuild; SCANBUILD_ARGS='-k -plist-html -maxloop 10' util/abuild/abuild -o $(COREBOOT_BUILD_DIR)/$${NAME} $(ABUILD_OPTIONS) -scan-build --target EMULATION_QEMU_X86_Q35 --exitcode --name $${NAME}
+ifneq ($(JENKINS_SKIP_GCC_TESTS),y)
 	NAME=gcc-chromeos; util/abuild/abuild -o $(COREBOOT_BUILD_DIR)/$${NAME} $(ABUILD_OPTIONS) -x --name $${NAME}
 	NAME=gcc; util/abuild/abuild -o $(COREBOOT_BUILD_DIR)/$${NAME} $(ABUILD_OPTIONS) --name $${NAME}
+endif
+ifneq ($(JENKINS_SKIP_CLANG_TESTS),y)
 	NAME=clang-chromeos; util/abuild/abuild -o $(COREBOOT_BUILD_DIR)/$${NAME} $(ABUILD_OPTIONS) -L -x --name $${NAME}
 	NAME=clang; util/abuild/abuild -o $(COREBOOT_BUILD_DIR)/$${NAME} $(ABUILD_OPTIONS) -L --name $${NAME}
+endif
 
 test-payloads:
 	$(MAKE) -C payloads/libpayload test-configs -j $(CPUS) V=$(V) Q=$(Q) MFLAGS= MAKEFLAGS= $(if $(TEST_NOCCACHE),,CONFIG_LP_CCACHE=y)