build: Use clang to compile the runtime if available

1 files changed, 7 insertions, 1 deletions

diff --git a/configure b/configure
index 897209a3..f24de59c 100755
--- a/configure
+++ b/configure
@@ -194,12 +194,13 @@ putvar CFG_CPUTYPE
 putvar CFG_CONFIGURE_ARGS
 
 step_msg "looking for build programs"
-probe_need CFG_GCC          gcc
 probe_need CFG_GIT          git
 probe_need CFG_PERL         perl
 probe_need CFG_PYTHON       python
 probe_need CFG_CURL         curl
 
+probe CFG_CLANG            clang
+probe CFG_GCC              gcc
 probe CFG_LLVM_CONFIG      llvm-config
 probe CFG_VALGRIND         valgrind
 probe CFG_OCAMLC           ocamlc
@@ -211,6 +212,11 @@ probe CFG_MAKEINFO         makeinfo
 probe CFG_TEXI2PDF         texi2pdf
 probe CFG_TEX              tex
 
+if [ -z "$CFG_CLANG" -a -z "$CFG_GCC" ]
+then
+    err "either clang or gcc is required"
+fi
+
 # Valgrind is only reliable on Linux. On Windows it doesn't work at all, and
 # on the Mac the dynamic linker causes Valgrind to emit a huge stream of
 # errors.