scripts/run-scan-build: update

- use multiple jobs
- define _FORTIFY_SOURCE=2 to enable checks on standard string handling
  functions due to macro/intrinsic overloads or function attributes
- allow to override clang and scan-build binaries, i.e. for using
  versioned ones
- set PYTHON_SETUP_ARGS accordingly on Debian
- enable common warning -Wextra
- print build result

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>

scripts/run-scan-build

@@ -1,6 +1,10 @@
 #!/bin/sh
 # Run clang's static analyzer (scan-build) and record its output in output-scan-build/
 
+# Allow overriding binariy names, like clang-12
+export CC=${CC:-clang}
+SCAN_BUILD=${SCAN_BUILD:-scan-build}
+
 # Ensure the current directory is where this script is
 cd "$(dirname -- "$0")" || exit $?
 
@@ -20,14 +24,24 @@ export PATH="$DESTDIR/usr/sbin:$DESTDIR/usr/bin:$DESTDIR/sbin:$DESTDIR/bin:$PATH
 export PYTHONPATH="$DESTDIR$(${PYTHON:-python3} -c "from distutils.sysconfig import *;print(get_python_lib(prefix='/usr'))")"
 export RUBYLIB="$DESTDIR/$(${RUBY:-ruby} -e 'puts RbConfig::CONFIG["vendorlibdir"]'):$DESTDIR/$(${RUBY:-ruby} -e 'puts RbConfig::CONFIG["vendorarchdir"]')"
 
+if [ -f /etc/debian_version ]; then
+    export PYTHON_SETUP_ARGS='--install-layout=deb'
+fi
+
 # Build and analyze
-make -C .. CC=clang clean distclean -j"$(nproc)"
-scan-build -analyze-headers -o "$OUTPUTDIR" make -C .. \
-    CC=clang \
+make -C .. clean distclean -j"$(nproc)"
+$SCAN_BUILD -analyze-headers -o "$OUTPUTDIR" make -C .. \
     DESTDIR="$DESTDIR" \
-    CFLAGS="-O2 -Wall -D__CHECKER__ -I$DESTDIR/usr/include" \
+    CFLAGS="-O2 -Wall -Wextra -D_FORTIFY_SOURCE=2 -D__CHECKER__ -I$DESTDIR/usr/include" \
+    -j"$(nproc)" \
     install install-pywrap install-rubywrap all test
 
+if [ $? -eq 0 ]; then
+    echo "++ Build succeeded"
+else
+    echo "++ Build failed"
+fi
+
 # Reduce the verbosity in order to keep the message from scan-build saying
 # "scan-build: Run 'scan-view /.../output-scan-build/2018-...' to examine bug reports.
 set +x