From 7a99f8f27f7dd7fadd7e7729952eaa2e4424f6c9 Mon Sep 17 00:00:00 2001
From: Darby Payne <darby.payne@gmail.com>
Date: Tue, 10 Mar 2020 03:22:15 -0700
Subject: [PATCH] Adding static library option (#5397)

---
 CMakeLists.txt    | 9 +++++++--
 cmake/Utils.cmake | 5 +++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 348e7e69f..30ee45d0a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,7 @@ set_default_configuration_release()
 #-- Options
 option(BUILD_C_DOC "Build documentation for C APIs using Doxygen." OFF)
 option(USE_OPENMP "Build with OpenMP support." ON)
+option(BUILD_STATIC_LIB "Build static library" OFF)
 ## Bindings
 option(JVM_BINDINGS "Build JVM bindings" OFF)
 option(R_LIB "Build shared library for R package" OFF)
@@ -133,8 +134,12 @@ add_subdirectory(${xgboost_SOURCE_DIR}/plugin)
 add_subdirectory(${xgboost_SOURCE_DIR}/src)
 set(XGBOOST_OBJ_SOURCES "${XGBOOST_OBJ_SOURCES};$<TARGET_OBJECTS:objxgboost>")
 
-#-- Shared library
-add_library(xgboost SHARED ${XGBOOST_OBJ_SOURCES})
+#-- library
+if (BUILD_STATIC_LIB)
+    add_library(xgboost STATIC ${XGBOOST_OBJ_SOURCES})
+else()
+    add_library(xgboost SHARED ${XGBOOST_OBJ_SOURCES})
+endif(BUILD_STATIC_LIB)
 target_include_directories(xgboost
   INTERFACE
   $<INSTALL_INTERFACE:${CMAKE_INSTALL_PREFIX}/include>
diff --git a/cmake/Utils.cmake b/cmake/Utils.cmake
index 8efe19d2f..4a9e63a77 100644
--- a/cmake/Utils.cmake
+++ b/cmake/Utils.cmake
@@ -65,6 +65,11 @@ function(set_output_directory target dir)
 		LIBRARY_OUTPUT_DIRECTORY_RELEASE ${dir}
 		LIBRARY_OUTPUT_DIRECTORY_RELWITHDEBINFO ${dir}
 		LIBRARY_OUTPUT_DIRECTORY_MINSIZEREL ${dir}
+		ARCHIVE_OUTPUT_DIRECTORY ${dir}
+		ARCHIVE_OUTPUT_DIRECTORY_DEBUG ${dir}
+		ARCHIVE_OUTPUT_DIRECTORY_RELEASE ${dir}
+		ARCHIVE_OUTPUT_DIRECTORY_RELWITHDEBINFO ${dir}
+		ARCHIVE_OUTPUT_DIRECTORY_MINSIZEREL ${dir}
 	)
 endfunction(set_output_directory)