From 8520e4812b6acaa0e24d5e633c0c882e19c6afa9 Mon Sep 17 00:00:00 2001
From: Matt Morehouse <mascasa@google.com>
Date: Thu, 12 Oct 2017 21:58:41 +0000
Subject: [PATCH] [cmake] Allow building fuzzers with OSS-Fuzz flags.

Reviewers: kcc, bogner

Reviewed By: bogner

Subscribers: mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D38858

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315629 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt              | 2 ++
 cmake/modules/AddLLVM.cmake | 9 +++++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 47c15e73ff2..bf9e4f4985f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -435,6 +435,8 @@ endif( LLVM_USE_OPROFILE )
 
 set(LLVM_USE_SANITIZER "" CACHE STRING
   "Define the sanitizer used to build binaries and tests.")
+set(LLVM_LIB_FUZZING_ENGINE "" CACHE PATH
+  "Path to fuzzing library for linking with fuzz targets")
 
 option(LLVM_USE_SPLIT_DWARF
   "Use -gsplit-dwarf when compiling llvm." OFF)
diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index 81e7211ef97..43341d388f8 100644
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -894,7 +894,12 @@ endmacro(add_llvm_utility name)
 
 macro(add_llvm_fuzzer name)
   cmake_parse_arguments(ARG "" "DUMMY_MAIN" "" ${ARGN})
-  if( LLVM_USE_SANITIZE_COVERAGE )
+  if( LLVM_LIB_FUZZING_ENGINE )
+    set(LLVM_OPTIONAL_SOURCES ${ARG_DUMMY_MAIN})
+    add_llvm_executable(${name} ${ARG_UNPARSED_ARGUMENTS})
+    target_link_libraries(${name} ${LLVM_LIB_FUZZING_ENGINE})
+    set_target_properties(${name} PROPERTIES FOLDER "Fuzzers")
+  elseif( LLVM_USE_SANITIZE_COVERAGE )
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsanitize=fuzzer")
     set(LLVM_OPTIONAL_SOURCES ${ARG_DUMMY_MAIN})
     add_llvm_executable(${name} ${ARG_UNPARSED_ARGUMENTS})
@@ -902,7 +907,7 @@ macro(add_llvm_fuzzer name)
   elseif( ARG_DUMMY_MAIN )
     add_llvm_executable(${name} ${ARG_DUMMY_MAIN} ${ARG_UNPARSED_ARGUMENTS})
     set_target_properties(${name} PROPERTIES FOLDER "Fuzzers")
-endif()
+  endif()
 endmacro()
 
 macro(add_llvm_target target_name)
-- 
2.50.1