From c079731e79e0483ca1a7d63fde026c3fdd09fabb Mon Sep 17 00:00:00 2001
From: Marc Butler <mockbutler@gmail.com>
Date: Wed, 18 Dec 2019 12:34:49 +1100
Subject: [PATCH] Add cmake option to enable PIC

Allows library to be used in the creation of dynamic libraries.
Not enabled by default.
---
 CMakeLists.txt | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f4cb860..3d0b51f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,6 +11,8 @@ set(SOEM_INCLUDE_INSTALL_DIR include/soem)
 set(SOEM_LIB_INSTALL_DIR lib)
 set(BUILD_TESTS TRUE)
 
+option(SOEM_PIC "Compile library as PIC, suitable for linking into a dynamic library." FALSE)
+
 if(WIN32)
   set(OS "win32")
   include_directories(oshw/win32/wpcap/Include)
@@ -66,6 +68,9 @@ add_library(soem STATIC
   ${OSHW_SOURCES}
   ${OSHW_EXTRA_SOURCES})
 target_link_libraries(soem ${OS_LIBS})
+if (SOEM_PIC)
+  set_property(TARGET soem PROPERTY POSITION_INDEPENDENT_CODE ON)
+endif (SOEM_PIC)
 
 target_include_directories(soem PUBLIC
   $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/soem>