build: disable gcc warning stringop-overflow for gcc-10 or greater

[vpp.git] / src / CMakeLists.txt

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a69942c..fb4463e 100644 (file)
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -13,16 +13,7 @@
 
 cmake_minimum_required(VERSION 3.13)
 
-set(CMAKE_C_COMPILER_NAMES
-  clang-13
-  clang-12
-  clang-11
-  clang-10
-  clang-9
-  gcc-10
-  gcc-9
-  cc
-)
+set(CMAKE_C_COMPILER_NAMES clang gcc cc)
 
 project(vpp C)
 
@@ -49,6 +40,43 @@ execute_process(
 string(REPLACE "-" ";" VPP_LIB_VERSION ${VPP_VERSION})
 list(GET VPP_LIB_VERSION 0 VPP_LIB_VERSION)
 
+##############################################################################
+# compiler specifics
+##############################################################################
+
+set(MIN_SUPPORTED_CLANG_C_COMPILER_VERSION 9.0.0)
+set(MIN_SUPPORTED_GNU_C_COMPILER_VERSION 9.0.0)
+
+if(CMAKE_C_COMPILER_ID STREQUAL "Clang")
+  if (CMAKE_C_COMPILER_VERSION VERSION_LESS MIN_SUPPORTED_CLANG_C_COMPILER_VERSION)
+    set(COMPILER_TOO_OLD TRUE)
+  endif()
+elseif(CMAKE_C_COMPILER_ID STREQUAL "GNU")
+  if (CMAKE_C_COMPILER_VERSION VERSION_LESS MIN_SUPPORTED_GNU_C_COMPILER_VERSION)
+    set(COMPILER_TOO_OLD TRUE)
+  endif()
+  set(GCC_STRING_OVERFLOW_WARNING_DISABLE_VERSION 10.0.0)
+  if (CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL GCC_STRING_OVERFLOW_WARNING_DISABLE_VERSION)
+    add_compile_options(-Wno-stringop-overflow)
+  endif()
+else()
+  message(WARNING "WARNING: Unsupported C compiler `${CMAKE_C_COMPILER_ID}` is used")
+  set (PRINT_MIN_C_COMPILER_VER TRUE)
+endif()
+if (COMPILER_TOO_OLD)
+  message(WARNING "WARNING: C compiler version is too old and it's usage may result")
+  message(WARNING "         in sub-optimal binaries or lack of support for specific CPU types.")
+  set (PRINT_MIN_C_COMPILER_VER TRUE)
+endif()
+
+if (PRINT_MIN_C_COMPILER_VER)
+  string (APPEND _t "Supported C compilers are ")
+  string (APPEND _t "Clang ${MIN_SUPPORTED_CLANG_C_COMPILER_VERSION} or higher ")
+  string (APPEND _t "and GNU ${MIN_SUPPORTED_GNU_C_COMPILER_VERSION} or higher.")
+  message(WARNING "         ${_t}")
+  unset (_t)
+endif()
+
 ##############################################################################
 # cross compiling
 ##############################################################################
@@ -275,3 +303,4 @@ pr("Target processor" ${CMAKE_SYSTEM_PROCESSOR})
 pr("Prefix path" ${CMAKE_PREFIX_PATH})
 pr("Install prefix" ${CMAKE_INSTALL_PREFIX})
 pr("Library dir" ${VPP_LIBRARY_DIR})
+pr("Multiarch variants" ${MARCH_VARIANTS_NAMES})