IntelLLVM: Add support for Intel LLVM-based compilers

Using a single ID 'IntelLLVM' for the suite of Intel compilers based on
the LLVM backend.  The 'IntelLLVM' ID are used for C, C++, and Fortran.
Data Parallel C++ will be handled in a separate commit.

The C and C++ definitions are based on the Clang definitions.  The Intel
LLVM-based C and C++ compilers are based on the Clang front end, so
existing Clang options are more likely to be a good match than options
for the older Intel compilers.

Fortran is based on the older Fortran front end with the LLVM backend.
It has a similar interface to the older versions, though many options
are shared with the C and C++ compilers.

Fixes: #21561
Signed-off-by: William R. Dieter <william.r.dieter@intel.com>

6 files changed, 297 insertions, 0 deletions

diff --git a/Modules/Compiler/IntelLLVM-ASM.cmake b/Modules/Compiler/IntelLLVM-ASM.cmake
new file mode 100644
index 0000000..c258a0a
--- /dev/null
+++ b/Modules/Compiler/IntelLLVM-ASM.cmake
@@ -0,0 +1,12 @@
+include(Compiler/IntelLLVM)
+__compiler_intel_llvm(ASM)
+
+string(APPEND CMAKE_ASM_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
+string(APPEND CMAKE_ASM_FLAGS_RELEASE_INIT " -DNDEBUG")
+string(APPEND CMAKE_ASM_FLAGS_RELWITHDEBINFO_INIT " -DNDEBUG")
+
+if(UNIX)
+  set(CMAKE_ASM_SOURCE_FILE_EXTENSIONS s;S)
+else()
+  set(CMAKE_ASM_SOURCE_FILE_EXTENSIONS asm)
+endif()
diff --git a/Modules/Compiler/IntelLLVM-C.cmake b/Modules/Compiler/IntelLLVM-C.cmake
new file mode 100644
index 0000000..0ad2f0d
--- /dev/null
+++ b/Modules/Compiler/IntelLLVM-C.cmake
@@ -0,0 +1,63 @@
+include(Compiler/IntelLLVM)
+__compiler_intel_llvm(C)
+
+if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC")
+  set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -TC)
+  set(CMAKE_C_CLANG_TIDY_DRIVER_MODE "cl")
+  if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
+      AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
+      AND CMAKE_DEPFILE_FLAGS_C)
+    set(CMAKE_C_DEPENDS_USE_COMPILER TRUE)
+  endif()
+else()
+  set(CMAKE_C_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c)
+  if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
+      AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
+      AND CMAKE_DEPFILE_FLAGS_C)
+    # dependencies are computed by the compiler itself
+    set(CMAKE_C_DEPFILE_FORMAT gcc)
+    set(CMAKE_C_DEPENDS_USE_COMPILER TRUE)
+  endif()
+
+  string(APPEND CMAKE_C_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
+  string(APPEND CMAKE_C_FLAGS_RELEASE_INIT " -DNDEBUG")
+  string(APPEND CMAKE_C_FLAGS_RELWITHDEBINFO_INIT " -DNDEBUG")
+endif()
+
+set(CMAKE_C90_STANDARD__HAS_FULL_SUPPORT ON)
+set(CMAKE_C99_STANDARD__HAS_FULL_SUPPORT ON)
+set(CMAKE_C11_STANDARD__HAS_FULL_SUPPORT ON)
+set(CMAKE_C17_STANDARD__HAS_FULL_SUPPORT ON)
+
+if(NOT "x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC")
+  set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
+  set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")
+
+  set(CMAKE_C99_STANDARD_COMPILE_OPTION "-std=c99")
+  set(CMAKE_C99_EXTENSION_COMPILE_OPTION "-std=gnu99")
+
+  set(CMAKE_C11_STANDARD_COMPILE_OPTION "-std=c11")
+  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "-std=gnu11")
+
+  set(CMAKE_C17_STANDARD_COMPILE_OPTION "-std=c17")
+  set(CMAKE_C17_EXTENSION_COMPILE_OPTION "-std=gnu17")
+else()
+  # clang-cl doesn't have any of these
+  set(CMAKE_C90_STANDARD_COMPILE_OPTION "")
+  set(CMAKE_C90_EXTENSION_COMPILE_OPTION "")
+
+  set(CMAKE_C99_STANDARD_COMPILE_OPTION "")
+  set(CMAKE_C99_EXTENSION_COMPILE_OPTION "")
+
+  set(CMAKE_C11_STANDARD_COMPILE_OPTION "")
+  set(CMAKE_C11_EXTENSION_COMPILE_OPTION "")
+
+  set(CMAKE_C17_STANDARD_COMPILE_OPTION "")
+  set(CMAKE_C17_EXTENSION_COMPILE_OPTION "")
+endif()
+
+if(NOT "x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC")
+  __compiler_check_default_language_standard(C 2020 17)
+else()
+  set(CMAKE_C_STANDARD_DEFAULT "")
+endif()
diff --git a/Modules/Compiler/IntelLLVM-CXX.cmake b/Modules/Compiler/IntelLLVM-CXX.cmake
new file mode 100644
index 0000000..4c0c26e
--- /dev/null
+++ b/Modules/Compiler/IntelLLVM-CXX.cmake
@@ -0,0 +1,69 @@
+include(Compiler/IntelLLVM)
+__compiler_intel_llvm(CXX)
+
+if("x${CMAKE_CXX_COMPILER_FRONTEND_VARIANT}" STREQUAL "xMSVC")
+  set(CMAKE_CXX_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -TP)
+  set(CMAKE_CXX_CLANG_TIDY_DRIVER_MODE "cl")
+  if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
+      AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
+      AND CMAKE_DEPFILE_FLAGS_CXX)
+    set(CMAKE_CXX_DEPENDS_USE_COMPILER TRUE)
+  endif()
+else()
+  set(CMAKE_CXX_COMPILE_OPTIONS_EXPLICIT_LANGUAGE -x c++)
+  if((NOT DEFINED CMAKE_DEPENDS_USE_COMPILER OR CMAKE_DEPENDS_USE_COMPILER)
+      AND CMAKE_GENERATOR MATCHES "Makefiles|WMake"
+      AND CMAKE_DEPFILE_FLAGS_CXX)
+    # dependencies are computed by the compiler itself
+    set(CMAKE_CXX_DEPFILE_FORMAT gcc)
+    set(CMAKE_CXX_DEPENDS_USE_COMPILER TRUE)
+  endif()
+
+  set(CMAKE_CXX_COMPILE_OPTIONS_VISIBILITY_INLINES_HIDDEN "-fvisibility-inlines-hidden")
+
+  string(APPEND CMAKE_CXX_FLAGS_MINSIZEREL_INIT " -DNDEBUG")
+  string(APPEND CMAKE_CXX_FLAGS_RELEASE_INIT " -DNDEBUG")
+  string(APPEND CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT " -DNDEBUG")
+endif()
+
+set(CMAKE_CXX98_STANDARD__HAS_FULL_SUPPORT ON)
+set(CMAKE_CXX11_STANDARD__HAS_FULL_SUPPORT ON)
+set(CMAKE_CXX14_STANDARD__HAS_FULL_SUPPORT ON)
+
+if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
+  set(CMAKE_CXX98_STANDARD_COMPILE_OPTION  "-std=c++98")
+  set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "-std=gnu++98")
+
+  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION  "-std=c++11")
+  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-std=gnu++11")
+
+  set(CMAKE_CXX14_STANDARD_COMPILE_OPTION  "-std=c++14")
+  set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-std=gnu++14")
+
+  set(CMAKE_CXX17_STANDARD_COMPILE_OPTION  "-std=c++17")
+  set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++17")
+
+  set(CMAKE_CXX20_STANDARD_COMPILE_OPTION  "-std=c++20")
+  set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++20")
+else()
+  set(CMAKE_CXX98_STANDARD_COMPILE_OPTION  "")
+  set(CMAKE_CXX98_EXTENSION_COMPILE_OPTION "")
+
+  set(CMAKE_CXX11_STANDARD_COMPILE_OPTION  "-Qstd=c++11")
+  set(CMAKE_CXX11_EXTENSION_COMPILE_OPTION "-Qstd=c++11")
+
+  set(CMAKE_CXX14_STANDARD_COMPILE_OPTION  "-Qstd=c++14")
+  set(CMAKE_CXX14_EXTENSION_COMPILE_OPTION "-Qstd=c++14")
+
+  set(CMAKE_CXX17_STANDARD_COMPILE_OPTION  "-Qstd=c++17")
+  set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-Qstd=c++17")
+
+  set(CMAKE_CXX20_STANDARD_COMPILE_OPTION  "-Qstd=c++20")
+  set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-Qstd=c++20")
+endif()
+
+if(NOT "x${CMAKE_CXX_SIMULATE_ID}" STREQUAL "xMSVC")
+  __compiler_check_default_language_standard(CXX 2020 14)
+else()
+  set(CMAKE_CXX_STANDARD_DEFAULT "")
+endif()
diff --git a/Modules/Compiler/IntelLLVM-DetermineCompiler.cmake b/Modules/Compiler/IntelLLVM-DetermineCompiler.cmake
new file mode 100644
index 0000000..124dafe
--- /dev/null
+++ b/Modules/Compiler/IntelLLVM-DetermineCompiler.cmake
@@ -0,0 +1,41 @@
+
+set(_compiler_id_pp_test "(defined(__clang__) && defined(__INTEL_CLANG_COMPILER)) || defined(__INTEL_LLVM_COMPILER)")
+
+set(_compiler_id_version_compute "
+/* __INTEL_LLVM_COMPILER = VVVVRP prior to 2021.2.0, VVVVRRPP for 2021.2.0 and
+ * later.  Look for 6 digit vs. 8 digit version number to decide encoding.
+ * VVVV is no smaller than the current year when a versio is released.
+ */
+#if __INTEL_LLVM_COMPILER < 1000000L
+# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__INTEL_LLVM_COMPILER/100)
+# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__INTEL_LLVM_COMPILER/10 % 10)
+# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__INTEL_LLVM_COMPILER    % 10)
+#else
+# define @PREFIX@COMPILER_VERSION_MAJOR @MACRO_DEC@(__INTEL_LLVM_COMPILER/10000)
+# define @PREFIX@COMPILER_VERSION_MINOR @MACRO_DEC@(__INTEL_LLVM_COMPILER/100 % 100)
+# define @PREFIX@COMPILER_VERSION_PATCH @MACRO_DEC@(__INTEL_LLVM_COMPILER     % 100)
+#endif
+#if defined(_MSC_VER)
+  /* _MSC_VER = VVRR */
+# define @PREFIX@SIMULATE_VERSION_MAJOR @MACRO_DEC@(_MSC_VER / 100)
+# define @PREFIX@SIMULATE_VERSION_MINOR @MACRO_DEC@(_MSC_VER % 100)
+#endif
+#if defined(__GNUC__)
+# define @PREFIX@SIMULATE_VERSION_MAJOR @MACRO_DEC@(__GNUC__)
+#elif defined(__GNUG__)
+# define @PREFIX@SIMULATE_VERSION_MAJOR @MACRO_DEC@(__GNUG__)
+#endif
+#if defined(__GNUC_MINOR__)
+# define @PREFIX@SIMULATE_VERSION_MINOR @MACRO_DEC@(__GNUC_MINOR__)
+#endif
+#if defined(__GNUC_PATCHLEVEL__)
+# define @PREFIX@SIMULATE_VERSION_PATCH @MACRO_DEC@(__GNUC_PATCHLEVEL__)
+#endif")
+
+set(_compiler_id_simulate "
+#if defined(_MSC_VER)
+# define @PREFIX@SIMULATE_ID \"MSVC\"
+#endif
+#if defined(__GNUC__)
+# define @PREFIX@SIMULATE_ID \"GNU\"
+#endif")
diff --git a/Modules/Compiler/IntelLLVM-Fortran.cmake b/Modules/Compiler/IntelLLVM-Fortran.cmake
new file mode 100644
index 0000000..3dfa099
--- /dev/null
+++ b/Modules/Compiler/IntelLLVM-Fortran.cmake
@@ -0,0 +1,19 @@
+include(Compiler/IntelLLVM)
+__compiler_intel_llvm(Fortran)
+
+set(CMAKE_Fortran_SUBMODULE_SEP "@")
+set(CMAKE_Fortran_SUBMODULE_EXT ".smod")
+
+set(CMAKE_Fortran_MODDIR_FLAG "-module ")
+set(CMAKE_Fortran_FORMAT_FIXED_FLAG "-fixed")
+set(CMAKE_Fortran_FORMAT_FREE_FLAG "-free")
+
+set(CMAKE_Fortran_COMPILE_WITH_DEFINES 1)
+
+set(CMAKE_Fortran_CREATE_PREPROCESSED_SOURCE "<CMAKE_Fortran_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
+set(CMAKE_Fortran_CREATE_ASSEMBLY_SOURCE "<CMAKE_Fortran_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
+
+set(CMAKE_Fortran_PREPROCESS_SOURCE
+  "<CMAKE_Fortran_COMPILER> -fpp <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
+set(CMAKE_Fortran_COMPILE_OPTIONS_PREPROCESS_ON "-fpp")
+set(CMAKE_Fortran_COMPILE_OPTIONS_PREPROCESS_OFF "-nofpp")
diff --git a/Modules/Compiler/IntelLLVM.cmake b/Modules/Compiler/IntelLLVM.cmake
new file mode 100644
index 0000000..43eb13a
--- /dev/null
+++ b/Modules/Compiler/IntelLLVM.cmake
@@ -0,0 +1,93 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+
+# This module is shared by multiple languages; use include blocker.
+if(__COMPILER_LLVM_INTEL)
+  return()
+endif()
+set(__COMPILER_LLVM_INTEL 1)
+
+include(Compiler/CMakeCommonCompilerMacros)
+
+set(__pch_header_C "c-header")
+set(__pch_header_CXX "c++-header")
+set(__pch_header_OBJC "objective-c-header")
+set(__pch_header_OBJCXX "objective-c++-header")
+
+if(CMAKE_HOST_WIN32)
+  # MSVC-like
+  macro(__compiler_intel_llvm lang)
+    set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-imsvc ")
+    if(NOT "x${lang}" STREQUAL "xFortran")
+      set(CMAKE_${lang}_COMPILE_OPTIONS_INVALID_PCH -Winvalid-pch)
+    endif()
+  endmacro()
+else()
+  # GNU-like
+  macro(__compiler_intel_llvm lang)
+    set(CMAKE_${lang}_VERBOSE_FLAG "-v")
+
+    string(APPEND CMAKE_${lang}_FLAGS_INIT " ")
+    string(APPEND CMAKE_${lang}_FLAGS_DEBUG_INIT " -g")
+    string(APPEND CMAKE_${lang}_FLAGS_MINSIZEREL_INIT " -Os")
+    string(APPEND CMAKE_${lang}_FLAGS_RELEASE_INIT " -O3")
+    string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g")
+
+    set(_CMAKE_${lang}_PIE_MAY_BE_SUPPORTED_BY_LINKER YES)
+    set(CMAKE_${lang}_COMPILE_OPTIONS_PIC "-fPIC")
+    set(CMAKE_${lang}_COMPILE_OPTIONS_PIE "-fPIE")
+    set(CMAKE_${lang}_LINK_OPTIONS_PIE ${CMAKE_${lang}_COMPILE_OPTIONS_PIE} "-pie")
+    set(CMAKE_${lang}_LINK_OPTIONS_NO_PIE "-no-pie")
+
+    set(CMAKE_SHARED_LIBRARY_${lang}_FLAGS "-fPIC")
+    set(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS "-shared")
+
+    set(CMAKE_${lang}_LINKER_WRAPPER_FLAG "-Wl,")
+    set(CMAKE_${lang}_LINKER_WRAPPER_FLAG_SEP ",")
+
+    # distcc does not transform -o to -MT when invoking the preprocessor
+    # internally, as it ought to.  Work around this bug by setting -MT here
+    # even though it isn't strictly necessary.
+    set(CMAKE_DEPFILE_FLAGS_${lang} "-MD -MT <DEP_TARGET> -MF <DEP_FILE>")
+
+    set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
+    set(CMAKE_${lang}_COMPILE_OPTIONS_VISIBILITY "-fvisibility=")
+    set(CMAKE_${lang}_COMPILE_OPTIONS_TARGET "--target=")
+    set(CMAKE_${lang}_COMPILE_OPTIONS_SYSROOT "--sysroot=")
+    set(CMAKE_${lang}_COMPILE_OPTIONS_EXTERNAL_TOOLCHAIN "--gcc-toolchain=")
+    set(CMAKE_${lang}_LINKER_WRAPPER_FLAG "-Xlinker" " ")
+    set(CMAKE_${lang}_LINKER_WRAPPER_FLAG_SEP)
+
+    set(_CMAKE_${lang}_IPO_SUPPORTED_BY_CMAKE YES)
+    set(_CMAKE_${lang}_IPO_MAY_BE_SUPPORTED_BY_COMPILER YES)
+    set(CMAKE_${lang}_COMPILE_OPTIONS_IPO "-flto=thin")
+    set(CMAKE_${lang}_ARCHIVE_CREATE_IPO "\"${CMAKE_${lang}_COMPILER_AR}\" cr <TARGET> <LINK_FLAGS> <OBJECTS>")
+    set(CMAKE_${lang}_ARCHIVE_APPEND_IPO "\"${CMAKE_${lang}_COMPILER_AR}\" r <TARGET> <LINK_FLAGS> <OBJECTS>")
+    set(CMAKE_${lang}_ARCHIVE_FINISH_IPO "\"${CMAKE_${lang}_COMPILER_RANLIB}\" <TARGET>")
+
+    set(CMAKE_${lang}_CREATE_PREPROCESSED_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
+    set(CMAKE_${lang}_CREATE_ASSEMBLY_SOURCE "<CMAKE_${lang}_COMPILER> <DEFINES> <INCLUDES> <FLAGS> -S <SOURCE> -o <ASSEMBLY_SOURCE>")
+
+    set(CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "${CMAKE_${lang}_COMPILER}")
+    if(CMAKE_${lang}_COMPILER_ARG1)
+      separate_arguments(_COMPILER_ARGS NATIVE_COMMAND "${CMAKE_${lang}_COMPILER_ARG1}")
+      list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND ${_COMPILER_ARGS})
+      unset(_COMPILER_ARGS)
+    endif()
+    list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "-dM" "-E" "-c" "${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp")
+    if(CMAKE_${lang}_COMPILER_TARGET)
+      list(APPEND CMAKE_${lang}_COMPILER_PREDEFINES_COMMAND "--target=${CMAKE_${lang}_COMPILER_TARGET}")
+    endif()
+
+    if(NOT "x${lang}" STREQUAL "xFortran")
+      # Precompile Headers
+      set(CMAKE_PCH_EXTENSION .pch)
+      set(CMAKE_PCH_PROLOGUE "#pragma clang system_header")
+      set(CMAKE_${lang}_COMPILE_OPTIONS_INSTANTIATE_TEMPLATES_PCH -fpch-instantiate-templates)
+      set(CMAKE_${lang}_COMPILE_OPTIONS_INVALID_PCH -Winvalid-pch)
+      set(CMAKE_${lang}_COMPILE_OPTIONS_USE_PCH -Xclang -include-pch -Xclang <PCH_FILE> -Xclang -include -Xclang <PCH_HEADER>)
+      set(CMAKE_${lang}_COMPILE_OPTIONS_CREATE_PCH -Xclang -emit-pch -Xclang -include -Xclang <PCH_HEADER> -x ${__pch_header_${lang}})
+    endif()
+  endmacro()
+endif()