build: downgrade cmake version to 3.11.4

Signed-off-by: black-desk <me@black-desk.cn>

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14..3.28.3)
+cmake_minimum_required(VERSION 3.11.4)
 
 project(
   ocppi
@@ -7,7 +7,24 @@ project(
 
 option(OCPPI_WITH_SPDLOG "Build ocppi with spdlog or not." OFF)
 
-include(./cmake/CPM.cmake)
+list(APPEND CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake)
+include(PFL)
+if(CMAKE_VERSION VERSION_LESS "3.14")
+  message(
+    STATUS "cmake version ${CMAKE_VERSION} not compatible with CPM.cmake, "
+           "CPMFindPackage fallback to simply find_package.")
+  # Only function we used in CPM.cmake is CPMFindPackage
+  function(CPMFindPackage)
+    cmake_parse_arguments(CPMFindPackage ""
+                          "NAME;VERSION;FIND_PACKAGE_ARGUMENTS" "" ${ARGN})
+    string(REPLACE " " ";" EXTRA_ARGS
+                   "${CPMFindPackage_FIND_PACKAGE_ARGUMENTS}")
+    find_package(${CPMFindPackage_NAME} ${CPMFindPackage_VERSION} ${EXTRA_ARGS}
+                 REQUIRED)
+  endfunction()
+else()
+  include(CPM)
+endif()
 
 set(OCPPI_TL_EXPECTED_VERSION 1.0.0) # debian buster-backports
 CPMFindPackage(

cmake/Findnlohmann_json.cmake

@@ -0,0 +1,7 @@
+include(CheckCXXSourceCompiles)
+
+check_cxx_source_compiles( "#include <nlohmann/json.hpp>" nlohmann_json_FOUND)
+
+if(nlohmann_json_FOUND)
+  add_library(nlohmann_json::nlohmann_json INTERFACE)
+endif()

cmake/GitSemver.cmake

@@ -16,7 +16,7 @@ function(gitsemver_message)
   message(STATUS "GitSemver: " ${ARGN})
 endfunction()
 
-message(STATUS "GitSemver: --==Version: v0.1.2==--")
+message(STATUS "GitSemver: --==Version: v0.1.3==--")
 
 # GitSemver will write the result to varname if it successfully get version
 # string from git repository.
@@ -45,7 +45,7 @@ function(GitSemver varname)
     COMMAND ${SED_EXECUTABLE} -e s/^v//
     COMMAND ${SED_EXECUTABLE} -e s/+\$//
     OUTPUT_VARIABLE ${varname} RESULTS_VARIABLE rets
-    OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET COMMAND_ECHO STDOUT)
+    OUTPUT_STRIP_TRAILING_WHITESPACE ERROR_QUIET)
 
   foreach(ret ${rets})
     if(NOT ret EQUAL 0)