Only use subcomponent if TurboFEC not found

CMakeLists.txt

@@ -15,22 +15,28 @@ find_package(Threads REQUIRED)
 find_package(aff3ct REQUIRED)
 
 ########################################################################
-# Build TurboFEC
+# Find or build TurboFEC
 ########################################################################
-set(turbofec_source_dir ${CMAKE_CURRENT_SOURCE_DIR}/turbofec)
-set(turbofec_binary_dir ${CMAKE_CURRENT_BINARY_DIR}/turbofec)
+find_package(TurboFEC)
+if(NOT TURBOFEC_FOUND)
+    message(STATUS "TurboFEC not found. Building in-tree static library.")
 
-include(ExternalProject)
-ExternalProject_Add(
-    prj_turbofec
-    SOURCE_DIR ${turbofec_source_dir}
-    CONFIGURE_COMMAND autoreconf -i ${turbofec_source_dir} && ${turbofec_source_dir}/configure --enable-shared=no --enable-static=yes --prefix=${turbofec_binary_dir}
-    PREFIX ${turbofec_source_dir}
-    BUILD_COMMAND make)
+    set(turbofec_source_dir ${CMAKE_CURRENT_SOURCE_DIR}/turbofec)
+    set(turbofec_binary_dir ${CMAKE_CURRENT_BINARY_DIR}/turbofec)
 
-ExternalProject_Get_Property(prj_turbofec install_dir)
-add_library(turbofec STATIC IMPORTED)
-set_property(TARGET turbofec PROPERTY IMPORTED_LOCATION ${CMAKE_CURRENT_BINARY_DIR}/turbofec/lib/libturbofec.a)
+    include(ExternalProject)
+    ExternalProject_Add(
+        prj_turbofec
+        SOURCE_DIR ${turbofec_source_dir}
+        CONFIGURE_COMMAND autoreconf -i ${turbofec_source_dir} && ${turbofec_source_dir}/configure --enable-shared=no --enable-static=yes --prefix=${turbofec_binary_dir}
+        PREFIX ${turbofec_source_dir}
+        BUILD_COMMAND make)
+
+    ExternalProject_Get_Property(prj_turbofec install_dir)
+
+    set(TURBOFEC_INCLUDE_DIRS ${CMAKE_CURRENT_BINARY_DIR}/turbofec/include)
+    set(TURBOFEC_LIBRARIES ${CMAKE_CURRENT_BINARY_DIR}/turbofec/lib/libturbofec.a)
+endif()
 
 ########################################################################
 # json.hpp header
@@ -46,7 +52,7 @@ include_directories(
     ${CMAKE_CURRENT_SOURCE_DIR}
     ${CMAKE_CURRENT_SOURCE_DIR}/Source
     ${CMAKE_CURRENT_SOURCE_DIR}/Testing
-    ${CMAKE_CURRENT_BINARY_DIR}/turbofec/include
+    ${TURBOFEC_INCLUDE_DIRS}
     ${JSON_HPP_INCLUDE_DIR})
 
 configure_file(
@@ -76,9 +82,11 @@ POTHOS_MODULE_UTIL(
         Testing/TestModuleInfo.cpp
         Testing/TestUtility.cpp
     LIBRARIES
-        turbofec
+        ${TURBOFEC_LIBRARIES}
         aff3ct::aff3ct-shared-lib
     ENABLE_DOCS ON
     DESTINATION fec
 )
-add_dependencies(FECBlocks prj_turbofec)
+if(NOT TURBOFEC_FOUND)
+    add_dependencies(FECBlocks prj_turbofec)
+endif()

cmake/FindTurboFEC.cmake

@@ -0,0 +1,34 @@
+# - Try to find turbofec
+# Once done this will define
+#
+#  TURBOFEC_FOUND - system has turbofec
+#  TURBOFEC_INCLUDE_DIRS - the turbofec include directory
+#  TURBOFEC_LIBRARIES - Link these to use turbofec
+#
+# Redistribution and use is allowed according to the terms of the New BSD license.
+# For details see the accompanying COPYING-CMAKE-SCRIPTS file.
+#
+
+include(FindPkgConfig)
+pkg_check_modules(PC_TURBOFEC QUIET turbofec)
+set(TURBOFEC_DEFINITIONS ${PC_TURBOFEC_CFLAGS_OTHER})
+
+find_path(TURBOFEC_INCLUDE_DIR turbofec/turbo.h
+          HINTS ${PC_TURBOFEC_INCLUDEDIR} ${PC_TURBOFEC_INCLUDE_DIRS}
+          PATH_SUFFIXES turbofec)
+
+find_library(TURBOFEC_LIBRARY NAMES turbofec
+             HINTS ${PC_TURBOFEC_LIBDIR} ${PC_TURBOFEC_LIBRARY_DIRS})
+
+set(TURBOFEC_VERSION ${PC_TURBOFEC_VERSION})
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(turbofec
+                                  REQUIRED_VARS TURBOFEC_LIBRARY TURBOFEC_INCLUDE_DIR
+                                  VERSION_VAR TURBOFEC_VERSION)
+
+mark_as_advanced(TURBOFEC_INCLUDE_DIR TURBOFEC_LIBRARY)
+
+set(TURBOFEC_LIBRARIES ${TURBOFEC_LIBRARY})
+set(TURBOFEC_INCLUDE_DIRS ${TURBOFEC_INCLUDE_DIR})
+