src: reclaim 'make check' for manual use, add scan-build support

Let's give Coverity Scan its own make target so we can reuse 'make check'
for our own scan-build or cppcheck needs.

[skip ci]

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

.github/workflows/coverity.yml

@@ -69,10 +69,10 @@ jobs:
           (cd libite && ./autogen.sh && ./configure && make && sudo make install)
           make dep
 
-      - name: Check applications
+      - name: Build applications for Coverity
         run: |
           export PATH=`pwd`/coverity/bin:$PATH
-          cov-build --dir cov-int make check
+          cov-build --dir cov-int make coverity-build
 
       - name: Submit results to Coverity Scan
         env:

src/Makefile

@@ -1,16 +1,32 @@
-# Host build of critical components, for Coverity Scan mostly
+# Host build of critical components, for static analysis
+#
+# Available targets:
+#   build        - Build all components (no static analysis)
+#   check        - Run static analysis (auto-detects scan-build or cppcheck)
+#   scan-build   - Run clang static analyzer (preferred)
+#   cppcheck     - Run cppcheck static analyzer (fallback)
+#   coverity     - Show Coverity Scan usage
+#   coverity-build - Build for Coverity Scan (used by CI)
+#   dep          - Build dependencies only
+#
 APPS = bin confd factory keyack statd
 
+# Detect available static analysis tools
+HAVE_SCANBUILD := $(shell command -v scan-build 2>/dev/null)
+HAVE_CPPCHECK  := $(shell command -v cppcheck 2>/dev/null)
+
 .PHONY: all
 all:
-	@echo "*** all not supported, only check possible ***"
-	false
+	@echo "*** all not supported, only build/check/coverity possible ***"
+	@false
 
 .PHONY: dep
 dep:
 	(cd libsrx && make -f check.mk dep)
 
-check: dep $(APPS)
+# Main build target (renamed from check)
+.PHONY: build
+build: dep $(APPS)
 	rm -rf staging
 
 $(APPS): libsrx
@@ -19,3 +35,83 @@ $(APPS): libsrx
 .PHONY: libsrx
 libsrx:
 	(cd $@ && make -f check.mk)
+
+# Static analysis target - auto-detects scan-build or cppcheck
+.PHONY: check
+check:
+ifdef HAVE_SCANBUILD
+	@echo "==> Running scan-build (clang static analyzer)"
+	$(MAKE) scan-build
+else ifdef HAVE_CPPCHECK
+	@echo "==> Running cppcheck (fallback - scan-build not found)"
+	@echo "    For better analysis, install scan-build:"
+	@echo "      Debian/Ubuntu: apt-get install clang-tools"
+	@echo "      Fedora/RHEL:   dnf install clang-tools-extra"
+	@echo ""
+	$(MAKE) cppcheck
+else
+	@echo "*** ERROR: No static analysis tool found ***"
+	@echo ""
+	@echo "Please install scan-build (recommended) or cppcheck:"
+	@echo "  Debian/Ubuntu: sudo apt-get install clang-tools"
+	@echo "  Fedora/RHEL:   sudo dnf install clang-tools-extra"
+	@echo "  Alpine:        apk add clang-extra-tools"
+	@echo ""
+	@echo "Or install cppcheck as fallback:"
+	@echo "  Debian/Ubuntu: sudo apt-get install cppcheck"
+	@echo "  Fedora/RHEL:   sudo dnf install cppcheck"
+	@false
+endif
+
+# Clang static analyzer (preferred)
+.PHONY: scan-build
+scan-build: dep
+ifndef HAVE_SCANBUILD
+	@echo "*** ERROR: scan-build not found ***"
+	@echo ""
+	@echo "Install scan-build for better static analysis:"
+	@echo "  Debian/Ubuntu: sudo apt-get install clang-tools"
+	@echo "  Fedora/RHEL:   sudo dnf install clang-tools-extra"
+	@echo "  Alpine:        apk add clang-extra-tools"
+	@false
+endif
+	@echo "==> Running scan-build on all components"
+	@rm -rf scan-results
+	scan-build -o scan-results --status-bugs $(MAKE) _analyze
+	@echo "==> Scan complete. Results in scan-results/"
+
+# cppcheck static analyzer
+.PHONY: cppcheck
+cppcheck: dep
+ifndef HAVE_CPPCHECK
+	@echo "*** ERROR: cppcheck not found ***"
+	@echo ""
+	@echo "Install cppcheck:"
+	@echo "  Debian/Ubuntu: sudo apt-get install cppcheck"
+	@echo "  Fedora/RHEL:   sudo dnf install cppcheck"
+	@echo ""
+	@echo "Or use scan-build (recommended) instead:"
+	@echo "  Debian/Ubuntu: sudo apt-get install clang-tools"
+	@false
+endif
+	@echo "==> Running cppcheck on all components"
+	@for app in libsrx $(APPS); do \
+		echo "  -> Checking $$app"; \
+		(cd $$app && cppcheck --enable=all --suppress=missingIncludeSystem \
+			--quiet --template=gcc -I../staging/include . 2>&1) || true; \
+	done
+	@echo "==> cppcheck complete"
+
+# Internal target for scan-build to analyze
+.PHONY: _analyze
+_analyze: libsrx $(APPS)
+	rm -rf staging
+
+# Coverity Scan target (for CI)
+.PHONY: coverity
+coverity:
+	@echo "==> Building for Coverity Scan"
+	@echo "Use: cov-build --dir cov-int make coverity-build"
+
+.PHONY: coverity-build
+coverity-build: build