From 345d1cd35567a5b22bb20258c97abdffb259ec20 Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <anonymous.maarten@gmail.com>
Date: Tue, 21 Mar 2023 20:38:36 +0100
Subject: [PATCH] cmake: add support for building with Intel C compiler

---
 CMakeLists.txt | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f43908f18..af9241f40 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -186,7 +186,7 @@ else()
 endif()
 
 # Compiler info
-if(CMAKE_C_COMPILER_ID MATCHES "Clang")
+if(CMAKE_C_COMPILER_ID MATCHES "Clang|IntelLLVM")
   set(USE_CLANG TRUE)
   set(SDL_ASSEMBLY_DEFAULT TRUE)
   # Visual Studio 2019 v16.2 added support for Clang/LLVM.
@@ -199,11 +199,14 @@ elseif(CMAKE_COMPILER_IS_GNUCC)
   set(SDL_ASSEMBLY_DEFAULT TRUE)
 elseif(MSVC_VERSION GREATER 1400) # VisualStudio 8.0+
   set(SDL_ASSEMBLY_DEFAULT TRUE)
+elseif(CMAKE_C_COMPILER_ID MATCHES "^Intel$")
+  set(SDL_ASSEMBLY_DEFAULT TRUE)
+  set(USE_INTELCC TRUE)
 else()
   set(SDL_ASSEMBLY_DEFAULT FALSE)
 endif()
 
-if(USE_GCC OR USE_CLANG)
+if(USE_GCC OR USE_CLANG OR USE_INTELCC)
   set(OPT_DEF_GCC_ATOMICS ON)
 endif()
 
@@ -296,7 +299,7 @@ target_include_directories(sdl-build-options
     "${SDL3_SOURCE_DIR}/include"
 )
 # Note: The clang toolset for Visual Studio does not support the '-idirafter' option.
-if(USE_GCC OR (USE_CLANG AND NOT MSVC_CLANG))
+if(USE_GCC OR USE_INTELCC OR (USE_CLANG AND NOT MSVC_CLANG))
   if(CMAKE_VERSION VERSION_LESS 3.12)
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -idirafter \"${SDL3_SOURCE_DIR}/src/video/khronos\"")
   else()
@@ -530,7 +533,7 @@ if(NOT SDL_FOREGROUNDING_SIGNAL STREQUAL "OFF")
 endif()
 
 # Compiler option evaluation
-if(USE_GCC OR USE_CLANG)
+if(USE_GCC OR USE_CLANG OR USE_INTELCC)
   # Check for -Wall first, so later things can override pieces of it.
   # Note: clang-cl treats -Wall as -Weverything (which is very loud),
   #       /W3 as -Wall, and /W4 as -Wall -Wextra.  So: /W3 is enough.
@@ -731,7 +734,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_MMX)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -mmmx")
     endif()
     check_c_source_compiles("
@@ -752,7 +755,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_SSE)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -msse")
     endif()
     check_c_source_compiles("
@@ -773,7 +776,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_SSE2)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -msse2")
     endif()
     check_c_source_compiles("
@@ -794,7 +797,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_SSE3)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -msse3")
     endif()
     check_c_source_compiles("
@@ -815,7 +818,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_SSE4_1)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -msse4.1")
     endif()
     check_c_source_compiles("
@@ -836,7 +839,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_SSE4_2)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -msse4.2")
     endif()
     check_c_source_compiles("
@@ -859,7 +862,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_AVX)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -mavx")
     endif()
     check_c_source_compiles("
@@ -880,7 +883,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_AVX2)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -mavx2")
     endif()
     check_c_source_compiles("
@@ -901,7 +904,7 @@ if(SDL_ASSEMBLY)
   endif()
   if(SDL_AVX512)
     cmake_push_check_state()
-    if(USE_GCC OR USE_CLANG)
+    if(USE_GCC OR USE_CLANG OR USE_INTELCC)
       set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -mavx512f")
     endif()
     check_c_source_compiles("
@@ -2957,7 +2960,7 @@ if(SDL_WERROR)
     if(HAVE_WX)
       target_compile_options(sdl-global-options INTERFACE "/WX")
     endif()
-  elseif(USE_GCC OR USE_CLANG)
+  elseif(USE_GCC OR USE_CLANG OR USE_INTELCC)
     check_c_compiler_flag(-Werror HAVE_WERROR)
     if(HAVE_WERROR)
       target_compile_options(sdl-global-options INTERFACE "-Werror")