From 037283c3b3e425193eebb766c17336ee55aa0384 Mon Sep 17 00:00:00 2001
From: Andrew Kelley <superjoe30@gmail.com>
Date: Sat, 30 Apr 2016 17:17:59 -0700
Subject: [PATCH] build: link against libLLVM.so if available

readme: better instructions for finding native libc headers
---
 README.md            | 8 ++++----
 cmake/Findllvm.cmake | 6 ++++++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index cef0d874a..367afa76d 100644
--- a/README.md
+++ b/README.md
@@ -75,14 +75,14 @@ compromises backward compatibility.
 
 ### Debug / Development Build
 
-If you have gcc or clang installed, you can find out what `ZIG_LIBC_LIB_DIR`
-and `ZIG_LIBC_STATIC_LIB_DIR` should be set to (example below).
-`ZIG_LIBC_INCLUDE_DIR` likely can be set to `/usr/include`.
+If you have gcc or clang installed, you can find out what `ZIG_LIBC_LIB_DIR`,
+`ZIG_LIBC_STATIC_LIB_DIR`, and `ZIG_LIBC_INCLUDE_DIR` should be set to
+(example below).
 
 ```
 mkdir build
 cd build
-cmake .. -DCMAKE_INSTALL_PREFIX=$(pwd) -DZIG_LIBC_LIB_DIR=$(dirname $(cc -print-file-name=crt1.o)) -DZIG_LIBC_INCLUDE_DIR=/usr/include -DZIG_LIBC_STATIC_LIB_DIR=$(dirname $(cc -print-file-name=crtbegin.o))
+cmake .. -DCMAKE_INSTALL_PREFIX=$(pwd) -DZIG_LIBC_LIB_DIR=$(dirname $(cc -print-file-name=crt1.o)) -DZIG_LIBC_INCLUDE_DIR=$(echo -n | cc -E -x c - -v 2>&1 | grep -B1 "End of search list." | head -n1 | cut -c 2-) -DZIG_LIBC_STATIC_LIB_DIR=$(dirname $(cc -print-file-name=crtbegin.o))
 make
 make install
 ./run_tests
diff --git a/cmake/Findllvm.cmake b/cmake/Findllvm.cmake
index 66a18560a..4216ed868 100644
--- a/cmake/Findllvm.cmake
+++ b/cmake/Findllvm.cmake
@@ -29,6 +29,12 @@ execute_process(
     OUTPUT_VARIABLE LLVM_INCLUDE_DIR
     OUTPUT_STRIP_TRAILING_WHITESPACE)
 
+find_library(LLVM_LIBRARY NAMES LLVM)
+
+if(LLVM_LIBRARY)
+  set(LLVM_LIBRARIES ${LLVM_LIBRARY})
+endif()
+
 
 set(LLVM_LIBRARIES ${LLVM_LIBRARIES} ${LLVM_SYSTEM_LIBS})