From cbd95adb499c04babe7c5268d5124815b9ace902 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Mon, 3 Feb 2020 11:43:58 -0800
Subject: [PATCH] configure: Add libllvm support check to configure.

---
 configure.ac | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/configure.ac b/configure.ac
index 834753cbe..d521a2e56 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1833,6 +1833,39 @@ AM_COND_IF([MALLOC_LIBS],
 	AC_DEFINE(IRCD_ALLOCATOR_USE_DEFAULT, 1, [Use the default allocator])
 ])
 
+dnl
+dnl
+dnl libLLVM
+dnl
+dnl
+
+AC_SUBST(LLVM_CPPFLAGS, [])
+AC_SUBST(LLVM_LDFLAGS, [])
+AC_SUBST(LLVM_LIBS, [])
+
+AC_ARG_WITH(llvm-includes,
+AC_HELP_STRING([--with-llvm-includes=[[[DIR]]]], [Path to libllvm include directory]),
+[
+	LLVM_CPPFLAGS="-isystem $withval"
+], [])
+
+AC_ARG_WITH(llvm-libs,
+AC_HELP_STRING([--with-llvm-libs=[[[DIR]]]], [Path to libllvm library directory]),
+[
+	LLVM_LDFLAGS="-L$withval"
+], [])
+
+AC_CHECK_LIB([LLVM-9], [LLVMBuildAnd],
+[
+	have_libllvm="yes"
+	LLVM_LIBS="-lLLVM-9"
+], [
+	have_libllvm="no"
+	AC_MSG_WARN([Unable to find LLVM-9 compiler infrastructure library on this system.])
+])
+
+AM_CONDITIONAL([LLVM], [test "x$have_libllvm" = "xyes" ])
+
 dnl
 dnl
 dnl Additional linkages
@@ -2039,6 +2072,7 @@ echo "SSL support ....................... $have_ssl"
 echo "Crypto support .................... $have_crypto"
 echo "Magic support ..................... $have_magic"
 echo "ImageMagick support ............... $have_imagemagick"
+echo "LLVM library support .............. $have_libllvm"
 echo "Linux AIO support ................. $aio"
 echo "Linux io_uring support ............ $io_uring"
 echo "Logging level ..................... $LOG_LEVEL"