From e3f00c3d304b22ccd875f6bf8fa1e0860dba3459 Mon Sep 17 00:00:00 2001
From: Hilko Bengen <bengen@hilluzination.de>
Date: Tue, 22 Jan 2019 18:10:47 +0100
Subject: [PATCH] configure: Introduce CLANG variable

---
 configure.ac | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/configure.ac b/configure.ac
index 8200be342f..712a67aa2d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,6 +29,15 @@
     AC_LANG_POP([C])
     AC_MSG_RESULT([${compiler}])
 
+    AC_ARG_WITH([clang],
+                [  --with-clang=PROGRAM    path to Clang for compiling eBPF code. Use if the main C compiler is not Clang.],
+                [CLANG="$withval"],
+                [AS_IF([test "$compiler" = clang],
+                       [CLANG="$CC"],
+                       [AC_PATH_PROG([CLANG],[clang])])])
+
+    AC_SUBST([CLANG])
+
     case "$compiler" in
         clang)
             CLANG_CFLAGS="-Wextra -Werror-implicit-function-declaration -Wno-error=unused-command-line-argument"
-- 
2.47.2