From 9462847f23a25524fdc2112cbc8de3f2c02a1669 Mon Sep 17 00:00:00 2001
From: Jan Heylen <jan.heylen@nokia.com>
Date: Fri, 22 Dec 2017 22:04:29 +0100
Subject: [PATCH] CMake: make shared/static target a configurable option

Signed-off-by: Jan Heylen <jan.heylen@nokia.com>
---
 CMakeLists.txt | 40 ++++++++++++++++++++++++++++------------
 1 file changed, 28 insertions(+), 12 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index aadf2f9..d03bd00 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,18 +70,36 @@ endif()
 include_directories(include)
 include_directories(SYSTEM 3rd_party/include)
 
+option(BUILD_SHARED_LIBS "Build as a shared library" ON)
+option(BUILD_STATIC_LIBS "Build as a static library" ON)
+
+if (NOT BUILD_SHARED_LIBS AND NOT BUILD_STATIC_LIBS)
+    message(FATAL_ERROR "One or both of BUILD_SHARED_LIBS or BUILD_STATIC_LIBS must be set to ON to build")
+endif()
+
 set(SRCS src/propagation.cpp src/noop.cpp src/tracer.cpp)
-add_library(opentracing SHARED ${SRCS})
-target_include_directories(opentracing INTERFACE "$<INSTALL_INTERFACE:include/>")
-set_target_properties(opentracing PROPERTIES VERSION ${OPENTRACING_VERSION_STRING}
+
+if (BUILD_SHARED_LIBS)
+  add_library(opentracing SHARED ${SRCS})
+  target_include_directories(opentracing INTERFACE "$<INSTALL_INTERFACE:include/>")
+  set_target_properties(opentracing PROPERTIES VERSION ${OPENTRACING_VERSION_STRING}
                                              SOVERSION ${OPENTRACING_VERSION_MAJOR})
-add_library(opentracing-static STATIC ${SRCS})
-set_target_properties(opentracing-static PROPERTIES OUTPUT_NAME opentracing)
-target_include_directories(opentracing-static INTERFACE "$<INSTALL_INTERFACE:include/>")
-if (CLANG_TIDY_EXE)
-  set_target_properties(opentracing PROPERTIES
+  install(TARGETS opentracing EXPORT OpenTracingTargets
+          LIBRARY DESTINATION lib
+          ARCHIVE DESTINATION lib)
+  if (CLANG_TIDY_EXE)
+    set_target_properties(opentracing PROPERTIES
                                     CXX_CLANG_TIDY "${DO_CLANG_TIDY}")
-endif()
+  endif()
+endif(BUILD_SHARED_LIBS)
+
+if (BUILD_STATIC_LIBS)
+  add_library(opentracing-static STATIC ${SRCS})
+  set_target_properties(opentracing-static PROPERTIES OUTPUT_NAME opentracing)
+  target_include_directories(opentracing-static INTERFACE "$<INSTALL_INTERFACE:include/>")
+  install(TARGETS opentracing-static EXPORT OpenTracingTargets
+          ARCHIVE DESTINATION lib)
+endif(BUILD_STATIC_LIBS)
 
 
 install(DIRECTORY 3rd_party/include/opentracing DESTINATION include
@@ -89,9 +107,7 @@ install(DIRECTORY 3rd_party/include/opentracing DESTINATION include
                            PATTERN "*.h")
 install(DIRECTORY include/opentracing DESTINATION include
             FILES_MATCHING PATTERN "*.h")
-install(TARGETS opentracing opentracing-static EXPORT OpenTracingTargets
-        LIBRARY DESTINATION lib
-        ARCHIVE DESTINATION lib)
+
 
 # ==============================================================================
 # Package configuration setup
-- 
2.7.4