HACKING.asciidoc: add commands to compile with clang

diff --git a/HACKING.asciidoc b/HACKING.asciidoc
index a59c4af..20c4aa2 100644 (file)
--- a/HACKING.asciidoc
+++ b/HACKING.asciidoc
@@ -50,6 +50,13 @@ can run:
   $ cmake -D CMAKE_C_COMPILER=cgcc ../
   $ make
 
+And for a pre-release check with a different compiler, which never hurts:
+
+  $ mkdir build
+  $ cd build
+  $ cmake -D CMAKE_C_COMPILER=clang -D CMAKE_BUILD_TYPE=debug -D STRICT_COMPILATION_CHECKS=ON ../
+  $ make
+
 === Cross Builds
 
 If you want to build for MS Windows: