CMake improvements (#369)

* Silence CMake warning by updating minimum versions.

* Generate files to build directory, not source directory

Author: rpavlik

CMakeLists.txt

@@ -1,5 +1,5 @@
 # Copyright (c) 2017 - 2021 LiteSpeed Technologies Inc.  See LICENSE.
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.0...3.23)
 
 
 PROJECT(lsquic C)

bin/CMakeLists.txt

@@ -1,4 +1,6 @@
 # Copyright (c) 2017 - 2021 LiteSpeed Technologies Inc.  See LICENSE.
+
+include_directories(${CMAKE_CURRENT_BINARY_DIR})
 LIST(APPEND LIBS ${EVENT_LIB})
 
 IF(MSVC)
@@ -109,4 +111,4 @@ ELSE()
 CHECK_INCLUDE_FILES(regex.h HAVE_REGEX)
 ENDIF()
 
-CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/test_config.h.in ${CMAKE_CURRENT_SOURCE_DIR}/test_config.h)
+CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/test_config.h.in ${CMAKE_CURRENT_BINARY_DIR}/test_config.h)

src/CMakeLists.txt

@@ -1,4 +1,4 @@
 # Copyright (c) 2017 - 2021 LiteSpeed Technologies Inc.  See LICENSE.
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.0...3.23)
 
 add_subdirectory(liblsquic)

src/liblsquic/CMakeLists.txt

@@ -107,12 +107,12 @@ ELSE()
 ENDIF()
 
 ADD_CUSTOM_COMMAND(
-    OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/lsquic_versions_to_string.c
+    OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/lsquic_versions_to_string.c
     COMMAND ${PERL}
-    ARGS ${CMAKE_CURRENT_SOURCE_DIR}/gen-verstrs.pl ${CMAKE_CURRENT_SOURCE_DIR}/../../include/lsquic.h ${CMAKE_CURRENT_SOURCE_DIR}/lsquic_versions_to_string.c
+    ARGS ${CMAKE_CURRENT_SOURCE_DIR}/gen-verstrs.pl ${CMAKE_CURRENT_SOURCE_DIR}/../../include/lsquic.h ${CMAKE_CURRENT_BINARY_DIR}/lsquic_versions_to_string.c
     DEPENDS ./gen-verstrs.pl ${CMAKE_CURRENT_SOURCE_DIR}/../../include/lsquic.h
 )
-SET(lsquic_STAT_SRCS ${lsquic_STAT_SRCS} lsquic_versions_to_string.c)
+SET(lsquic_STAT_SRCS ${lsquic_STAT_SRCS} ${CMAKE_CURRENT_BINARY_DIR}/lsquic_versions_to_string.c)
 SET(lsquic_STAT_SRCS ${lsquic_STAT_SRCS} ls-sfparser.c)
 
 SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DXXH_HEADER_NAME=\\\"lsquic_xxhash.h\\\"")