coverage: clean possible mainline runs before collecting coverage

If the Makefile has already been generated, things might have been
configured and built using clang, which also means ASan symbols that
GCC will not like will be around. Clean the repository with distclean
before running if signs of previous compilations are present.

Author: kaoudis

codecoverage.sh

@@ -18,6 +18,14 @@ OPENSSLDIR=/tmp/openssl
 NGHTTPDIR=/tmp/nghttp2
 INSTALLDIR=/tmp/curlcov_install
 
+# mainline.sh and codecoverage.sh use different compilers and the ASAN and
+# other LLVM specific things don't work with GCC so make sure we clean up
+# if there have been earlier mainline runs locally
+if [[ -d .deps/ && -f Makefile ]]
+then
+	make distclean
+fi
+
 # Install openssl
 ${SCRIPTDIR}/handle_x.sh openssl ${OPENSSLDIR} ${INSTALLDIR} || exit 1