Add 'lto' Makefile target and CI job

.gitlab-ci.yml

@@ -103,6 +103,10 @@ clang-tidy:
     EMPER_CPP_ARGS: "-stdlib=libc++"
     EMPER_CPP_LINK_ARGS: "-stdlib=libc++"
 
+.lto:
+  variables:
+    EMPER_B_LTO: "true"
+
 .emper-ws-scheduling:
   variables:
     EMPER_DEFAULT_SCHEDULING_STRATEGY: "work_stealing"
@@ -293,6 +297,11 @@ smoke-test-libc++:
     - .fast-variant-check
     - .libc++
 
+test-lto:
+  extends:
+    - .test
+    - .lto
+
 test-libc++:
   extends:
     - .test

Makefile

@@ -75,6 +75,14 @@ stats:
 		EMPER_STATS=true \
 		BUILDDIR="build-$@"
 
+.PHONY: lto
+lto:
+	rm -f build
+	$(MAKE) build \
+		BUILDTYPE=release \
+		EMPER_B_LTO=true \
+		BUILDDIR="build-$@"
+
 .PHONY: fast-static-analysis
 fast-static-analysis: all check-format check-license doc