From: Damjan Marion <damarion@cisco.com>
Date: Thu, 14 Apr 2022 20:18:19 +0000 (+0200)
Subject: build: c compiler version warnings
X-Git-Tag: v22.10-rc0~85
X-Git-Url: https://gerrit.fd.io/r/gitweb?a=commitdiff_plain;h=8cb5d36c7e7492d3cc314e6b78dea571bbcc4889;p=vpp.git

build: c compiler version warnings

Type: make
Change-Id: I9455da47f03383df822436d1adc4c4b5e58c7cf9
Signed-off-by: Damjan Marion <damarion@cisco.com>
---

diff --git a/Makefile b/Makefile
index 8eb1d54189d..fef563bb534 100644
--- a/Makefile
+++ b/Makefile
@@ -85,17 +85,17 @@ ifeq ($(OS_VERSION_ID),20.04)
 	DEB_DEPENDS += python3-virtualenv
 	DEB_DEPENDS += libssl-dev
 	DEB_DEPENDS += libelf-dev # for libbpf (af_xdp)
-	DEB_DEPENDS += clang-11 clang-format-11
+	DEB_DEPENDS += clang clang-format-11
 	LIBFFI=libffi7
 	DEB_DEPENDS += enchant-2  # for docs
 else ifeq ($(OS_VERSION_ID),20.10)
-	DEB_DEPENDS += clang-11 clang-format-11
+	DEB_DEPENDS += clang clang-format-11
 	LIBFFI=libffi8ubuntu1
 else ifeq ($(OS_ID)-$(OS_VERSION_ID),debian-10)
 	DEB_DEPENDS += virtualenv
 else ifeq ($(OS_ID)-$(OS_VERSION_ID),debian-11)
 	DEB_DEPENDS += virtualenv
-	DEB_DEPENDS += clang-11 clang-format-11
+	DEB_DEPENDS += clang clang-format-11
 	LIBFFI=libffi7
 else
 	DEB_DEPENDS += clang-11 clang-format-11
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a1c18ff0951..de0c24135d7 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -13,17 +13,7 @@
 
 cmake_minimum_required(VERSION 3.13)
 
-set(CMAKE_C_COMPILER_NAMES
-  clang-14
-  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)
 
@@ -50,6 +40,39 @@ 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()
+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
 ##############################################################################