From f58fd19f52029fbc2bf45c0d45650a918ee9f7c7 Mon Sep 17 00:00:00 2001
From: Xinzhao Zhu <zhuxinzhao@ubuntu.wsl2>
Date: Sun, 17 May 2020 22:55:56 +0800
Subject: [PATCH] Use CMake's Threads library to provide '-pthread` for Linux

For linux platform, we may use the Threads library to provide
the option `-pthread` when the program uses multiple thread. This
solution is portable for WSL2/Linux and other disturbuiton.
---
 CMakeLists.txt      | 3 ++-
 lint/CMakeLists.txt | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0e868da..f3766e3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,7 @@
 cmake_minimum_required(VERSION 3.1.0)
 project("cpp-peglib")
 
+find_package(Threads)
 # Check if a supported compiler is used to setup the C++ standard to use:
 get_property(known_features GLOBAL PROPERTY CMAKE_CXX_KNOWN_FEATURES)
 list(FIND known_features "cxx_std_17" found)
@@ -31,7 +32,7 @@ elseif(MSVC)
 endif()
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-  set(add_link_deps pthread)
+  set(add_link_deps Threads::Threads)
 endif()
 
 enable_testing()
diff --git a/lint/CMakeLists.txt b/lint/CMakeLists.txt
index 88a9204..5561422 100644
--- a/lint/CMakeLists.txt
+++ b/lint/CMakeLists.txt
@@ -5,5 +5,5 @@ add_definitions("-std=c++11")
 add_executable(peglint peglint.cc)
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
-  target_link_libraries(peglint pthread)
+  target_link_libraries(peglint ${add_link_deps})
 endif()