[#82] Unify CMake minimum version 3.15 across whole build system

Author: Mi-La

cmake/clang_format_tool.cmake

@@ -1,11 +1,14 @@
 # Script called from clang_format_utils.cmake to run clang-format and preserve it's output.
 #
+# Prerequisites:
+#   CMake 3.15+
+#
 # Expected definitions:
 #   CLANG_FORMAT_BIN Clang format binary.
 #   SOURCE           Source to check by clang-format.
 #   CONFIG_FILE      Path to the clang-format config file.
 #   WERROR           Ends with an error in case of any format violation.
-cmake_minimum_required(VERSION 3.6.0)
+cmake_minimum_required(VERSION 3.15.0)
 
 foreach (ARG CLANG_FORMAT_BIN SOURCE CONFIG_FILE WERROR)
     if (NOT DEFINED ${ARG})

cmake/clang_tidy_check.cmake

@@ -1,5 +1,8 @@
 # Script called from clang_tidy_utils.cmake to run checks for unexpected warnings.
 #
+# Prerequisites:
+#   CMake 3.15+
+#
 # Expected definitions:
 #   LOG_FILE          File containing clang-tidy log.
 #   SUPPRESSIONS_FILE Suppressions file for clang-tidy warnings. If any warnings are fired but not suppressed,
@@ -12,7 +15,7 @@
 #   WERROR            Ends with an error in case of any unsuppressed clang-tidy warnings.
 #   WERROR_UNUSED_SUPPRESSIONS
 #                     Fires an error in case of unused suppressions.
-cmake_minimum_required(VERSION 3.6.0)
+cmake_minimum_required(VERSION 3.15.0)
 
 # splits suppression to RULE and PATH_MATCHER parts
 function(get_matchers SUPPRESSION RULE_VAR PATH_MATCHER_VAR)

cmake/clang_tidy_tool.cmake

@@ -1,13 +1,16 @@
 # Script called from clang_tidy_utils.cmake to run clang-tidy and preserve it's output.
 #
+# Prerequisites:
+#   CMake 3.15+
+#
 # Expected definitions:
 #   CLANG_TIDY_BIN Clang Tidy binary.
 #   SOURCES        Sources to check by clang-tidy.
 #   BUILD_PATH     Build path containing compilation database. Use -DCMAKE_EXPORT_COMPILE_COMMANDS=ON.
 #   CONFIG_FILE    Path to the clang-tidy config file.
 #   HEADER_FILTER  Header filter to use.
 #   OUTPUT_FILE    Output file to use.
-cmake_minimum_required(VERSION 3.6.0)
+cmake_minimum_required(VERSION 3.15.0)
 
 separate_arguments(SOURCES)
 

cmake/zserio_compiler.cmake

@@ -69,6 +69,11 @@
 # - ZSERIO_JAR_FILE is changed
 # - zserio schema sources are changed
 # - EXTRA_ARGS are changed
+
+if (CMAKE_VERSION VERSION_LESS "3.15.0")
+    message(FATAL_ERROR "CMake 3.15+ is required!")
+endif ()
+
 function(zserio_generate_cpp)
     find_program(JAVA java)
     if (NOT JAVA)

compiler/extensions/cpp/runtime/CMakeLists.txt

@@ -6,7 +6,7 @@
 # This CMake file is designed to be included directly without any further dependencies.
 #
 
-cmake_minimum_required(VERSION 3.9.0)
+cmake_minimum_required(VERSION 3.15.0)
 
 project(ZserioCppRuntimeTests)
 

compiler/extensions/cpp/runtime/src/CMakeLists.txt

@@ -13,7 +13,7 @@
 # add_executable(ZserioTestApp HelloWorld.cpp)
 # target_link_libraries(ZserioTestApp ZserioCppRuntime)
 
-cmake_minimum_required(VERSION 3.1.0)
+cmake_minimum_required(VERSION 3.15.0)
 
 project(ZserioCppRuntime)
 

compiler/extensions/cpp/runtime/test/CMakeLists.txt

@@ -5,8 +5,6 @@
 # This CMake file is NOT designed to be included directly without any further dependencies.
 #
 
-cmake_minimum_required(VERSION 3.9.0)
-
 project(ZserioCppRuntimeTest)
 
 # add gtest library

compiler/extensions/cpp/runtime/test/zserio/deprecated_attribute/CMakeLists.txt

@@ -1,5 +1,3 @@
-cmake_minimum_required(VERSION 3.6.0)
-
 include(ExternalProject)
 
 ExternalProject_add(DeprecatedAttribute

compiler/extensions/cpp/runtime/test/zserio/deprecated_attribute/src/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.6.0)
+cmake_minimum_required(VERSION 3.15.0)
 
 project(DeprecatedAttribute)
 

scripts/test_perf.sh

@@ -276,7 +276,7 @@ generate_cpp_files()
     local BUILD_SRC_DIR="${BUILD_DIR}/src"
     mkdir -p "${BUILD_SRC_DIR}"
     cat > "${BUILD_SRC_DIR}"/CMakeLists.txt << EOF
-cmake_minimum_required(VERSION 3.6.0)
+cmake_minimum_required(VERSION 3.15.0)
 project(PerformanceTest)
 
 enable_testing()

scripts/test_zs.sh

@@ -201,7 +201,7 @@ compiler_set_warnings_as_errors()"
     fi
 
     cat > ${BUILD_DIR}/CMakeLists.txt << EOF
-cmake_minimum_required(VERSION 3.6.0)
+cmake_minimum_required(VERSION 3.15.0)
 project(test_zs_${TEST_NAME})
 
 enable_testing()

test/utils/cpp/test_utils/CMakeLists.txt

@@ -2,17 +2,9 @@
 #
 # This CMake file defines utility library which is used for all C++ integration tests.
 #
-cmake_minimum_required(VERSION 3.6.0)
 
 project(ZserioCppTestUtils)
 
-# input parameters
-set(CLANG_FORMAT_BIN "" CACHE STRING "Name of clang-format binary. If empty, clang-format tool is not called.")
-set(ZSERIO_PROJECT_ROOT "${CMAKE_CURRENT_SOURCE_DIR}/../../../..")
-
-# cmake helpers
-include(clang_format_utils)
-
 set(ZSERIO_CPP_TEST_UTILS_SOURCES
         ${CMAKE_CURRENT_SOURCE_DIR}/Assertions.h
         ${CMAKE_CURRENT_SOURCE_DIR}/LocalServiceClient.h