1 files changed, 18 insertions, 0 deletions
diff --git a/m4/ax_cc_clang.m4 b/m4/ax_cc_clang.m4
new file mode 100644
index 0000000..abf2991
--- /dev/null
+++ b/m4/ax_cc_clang.m4
@@ -0,0 +1,18 @@
+dnl Check to see if the C compiler is clang and which version it is
+dnl
+AC_DEFUN([AX_CC_CLANG],[
+  AC_REQUIRE([AC_PROG_CC])
+  AC_MSG_CHECKING([whether C compiler is clang])
+  CC_CLANG_VERSION=$(
+    $CC -x c -dM -E /dev/null | \
+    $GREP '__clang_version__' | \
+    $GREP -o '".*"' | \
+    $SED 's/^"\(.*\)"$/\1/g'
+  )
+  AC_SUBST([CC_CLANG_VERSION])
+  if test -n "$CC_CLANG_VERSION"; then
+    AC_MSG_RESULT([$CC_CLANG_VERSION])
+  else
+    AC_MSG_RESULT([no])
+  fi
+  ])