[llvm-branch-commits] [clang] [flang] [llvm] [Flang] LLVM_ENABLE_RUNTIMES=flang-rt (PR #110217)
via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Fri Jan 24 10:43:53 PST 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang-driver
Author: Michael Kruse (Meinersbur)
<details>
<summary>Changes</summary>
Extract Flang's runtime library to use the LLVM_ENABLE_RUNTIME mechanism.
Motivation:
* Consistency with LLVM's other runtime libraries (compiler-rt, libc, libcxx, openmp offload, ...)
* Allows compiling the runtime for multiple targets at once using the LLVM_RUNTIME_TARGETS configuration options
* Installs the runtime into the compiler's per-target resource directory so it can be automatically found even when cross-compiling
Potential future directions:
* Uses CMake's support for compiling Fortran files, including dependency resolution of Fortran modules
* Improve robustness of compiling `libomp.mod` when openmp is available
* Remove Flang's dependency from flang-rt's RTNAME function declarations (tblgen?)
* Reduce Flang's build-time dependency from flang-rt's `REAL(16)` support
See RFC discussion at https://discourse.llvm.org/t/rfc-use-llvm-enable-runtimes-for-flangs-runtime/80826
Patch series:
* #<!-- -->110244
* #<!-- -->112188
* #<!-- -->121997
* #<!-- -->122069
* #<!-- -->122334
* #<!-- -->122336
* #<!-- -->122341
* #<!-- -->110298
* #<!-- -->110217 (this PR)
* #<!-- -->121782
* #<!-- -->124126
Patch for lab.llvm.org buildbots:
* https://github.com/llvm/llvm-zorg/pull/333
---
Patch is 108.72 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/110217.diff
41 Files Affected:
- (modified) clang/lib/Driver/ToolChains/Flang.cpp (+9-5)
- (added) flang-rt/.clang-tidy (+2)
- (added) flang-rt/CMakeLists.txt (+248)
- (added) flang-rt/CODE_OWNERS.TXT (+14)
- (added) flang-rt/LICENSE.TXT (+234)
- (added) flang-rt/README.md (+188)
- (added) flang-rt/cmake/modules/AddFlangRT.cmake (+186)
- (added) flang-rt/cmake/modules/AddFlangRTOffload.cmake (+101)
- (added) flang-rt/cmake/modules/GetToolchainDirs.cmake (+125)
- (added) flang-rt/lib/CMakeLists.txt (+18)
- (added) flang-rt/lib/FortranFloat128Math/CMakeLists.txt (+136)
- (added) flang-rt/lib/Testing/CMakeLists.txt (+20)
- (added) flang-rt/lib/flang_rt/CMakeLists.txt (+213)
- (added) flang-rt/lib/flang_rt/CUDA/CMakeLists.txt (+33)
- (modified) flang-rt/lib/flang_rt/io-api-minimal.cpp (+1-1)
- (added) flang-rt/test/CMakeLists.txt (+59)
- (modified) flang-rt/test/Driver/ctofortran.f90 (+5-24)
- (modified) flang-rt/test/Driver/exec.f90 (+4-4)
- (added) flang-rt/test/NonGtestUnit/lit.cfg.py (+22)
- (added) flang-rt/test/NonGtestUnit/lit.site.cfg.py.in (+14)
- (modified) flang-rt/test/Runtime/no-cpp-dep.c (+3-2)
- (added) flang-rt/test/Unit/lit.cfg.py (+21)
- (added) flang-rt/test/Unit/lit.site.cfg.py.in (+15)
- (added) flang-rt/test/lit.cfg.py (+102)
- (added) flang-rt/test/lit.site.cfg.py.in (+19)
- (added) flang-rt/unittests/CMakeLists.txt (+111)
- (added) flang-rt/unittests/Evaluate/CMakeLists.txt (+21)
- (added) flang-rt/unittests/Runtime/CMakeLists.txt (+48)
- (added) flang-rt/unittests/Runtime/CUDA/CMakeLists.txt (+18)
- (modified) flang/CMakeLists.txt (+26-27)
- (added) flang/cmake/modules/FlangCommon.cmake (+43)
- (modified) flang/docs/GettingStarted.md (+58-50)
- (modified) flang/docs/ReleaseNotes.md (+7-1)
- (modified) flang/module/iso_fortran_env_impl.f90 (+1-1)
- (modified) flang/test/lit.cfg.py (-20)
- (modified) flang/test/lit.site.cfg.py.in (-3)
- (modified) llvm/CMakeLists.txt (+7-1)
- (modified) llvm/cmake/modules/LLVMExternalProjectUtils.cmake (+15-1)
- (modified) llvm/projects/CMakeLists.txt (+3-1)
- (modified) llvm/runtimes/CMakeLists.txt (+18-7)
- (modified) runtimes/CMakeLists.txt (+1-1)
``````````diff
diff --git a/clang/lib/Driver/ToolChains/Flang.cpp b/clang/lib/Driver/ToolChains/Flang.cpp
index 68a17edf8ca341..17a8a4dd8d0a87 100644
--- a/clang/lib/Driver/ToolChains/Flang.cpp
+++ b/clang/lib/Driver/ToolChains/Flang.cpp
@@ -342,11 +342,15 @@ static void processVSRuntimeLibrary(const ToolChain &TC, const ArgList &Args,
ArgStringList &CmdArgs) {
assert(TC.getTriple().isKnownWindowsMSVCEnvironment() &&
"can only add VS runtime library on Windows!");
- // if -fno-fortran-main has been passed, skip linking Fortran_main.a
- if (TC.getTriple().isKnownWindowsMSVCEnvironment()) {
- CmdArgs.push_back(Args.MakeArgString(
- "--dependent-lib=" + TC.getCompilerRTBasename(Args, "builtins")));
- }
+
+ // Flang/Clang (including clang-cl) -compiled programs targeting the MSVC ABI
+ // should only depend on msv(u)crt. LLVM still emits libgcc/compiler-rt
+ // functions in some cases like 128-bit integer math (__udivti3, __modti3,
+ // __fixsfti, __floattidf, ...) that msvc does not support. We are injecting a
+ // dependency to Compiler-RT's builtin library where these are implemented.
+ CmdArgs.push_back(Args.MakeArgString(
+ "--dependent-lib=" + TC.getCompilerRTBasename(Args, "builtins")));
+
unsigned RTOptionID = options::OPT__SLASH_MT;
if (auto *rtl = Args.getLastArg(options::OPT_fms_runtime_lib_EQ)) {
RTOptionID = llvm::StringSwitch<unsigned>(rtl->getValue())
diff --git a/flang-rt/.clang-tidy b/flang-rt/.clang-tidy
new file mode 100644
index 00000000000000..ee3a0ab2201bf3
--- /dev/null
+++ b/flang-rt/.clang-tidy
@@ -0,0 +1,2 @@
+Checks: '-llvm-include-order,readability-braces-around-statements,-readability-identifier-naming,-clang-diagnostic-*'
+InheritParentConfig: true
diff --git a/flang-rt/CMakeLists.txt b/flang-rt/CMakeLists.txt
new file mode 100644
index 00000000000000..655d0a55b40044
--- /dev/null
+++ b/flang-rt/CMakeLists.txt
@@ -0,0 +1,248 @@
+#===-- CMakeLists.txt ------------------------------------------------------===#
+#
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+#
+#===------------------------------------------------------------------------===#
+#
+# Build instructions for the flang-rt library. This is file is intended to be
+# included using the LLVM_ENABLE_RUNTIMES mechanism.
+#
+#===------------------------------------------------------------------------===#
+
+if (NOT LLVM_RUNTIMES_BUILD)
+ message(FATAL_ERROR "Use this CMakeLists.txt from LLVM's runtimes build system.
+ Example:
+ cmake <llvm-project>/runtimes -DLLVM_ENABLE_RUNTIMES=flang-rt
+ ")
+endif ()
+
+set(LLVM_SUBPROJECT_TITLE "Flang-RT")
+set(FLANG_RT_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}")
+set(FLANG_RT_BINARY_DIR "${CMAKE_CURRENT_BINARY_DIR}")
+set(FLANG_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../flang")
+
+# CMake 3.24 is the first version of CMake that directly recognizes Flang.
+# LLVM's requirement is only CMake 3.20, teach CMake 3.20-3.23 how to use Flang.
+if (CMAKE_VERSION VERSION_LESS "3.24")
+ cmake_path(GET CMAKE_Fortran_COMPILER STEM _Fortran_COMPILER_STEM)
+ if (_Fortran_COMPILER_STEM STREQUAL "flang-new" OR _Fortran_COMPILER_STEM STREQUAL "flang")
+ include(CMakeForceCompiler)
+ CMAKE_FORCE_Fortran_COMPILER("${CMAKE_Fortran_COMPILER}" "LLVMFlang")
+
+ set(CMAKE_Fortran_COMPILER_ID "LLVMFlang")
+ set(CMAKE_Fortran_COMPILER_VERSION "${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}")
+
+ set(CMAKE_Fortran_SUBMODULE_SEP "-")
+ set(CMAKE_Fortran_SUBMODULE_EXT ".mod")
+
+ set(CMAKE_Fortran_PREPROCESS_SOURCE
+ "<CMAKE_Fortran_COMPILER> -cpp <DEFINES> <INCLUDES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")
+
+ set(CMAKE_Fortran_FORMAT_FIXED_FLAG "-ffixed-form")
+ set(CMAKE_Fortran_FORMAT_FREE_FLAG "-ffree-form")
+
+ set(CMAKE_Fortran_MODDIR_FLAG "-module-dir")
+
+ set(CMAKE_Fortran_COMPILE_OPTIONS_PREPROCESS_ON "-cpp")
+ set(CMAKE_Fortran_COMPILE_OPTIONS_PREPROCESS_OFF "-nocpp")
+ set(CMAKE_Fortran_POSTPROCESS_FLAG "-ffixed-line-length-72")
+
+ set(CMAKE_Fortran_COMPILE_OPTIONS_TARGET "--target=")
+
+ set(CMAKE_Fortran_LINKER_WRAPPER_FLAG "-Wl,")
+ set(CMAKE_Fortran_LINKER_WRAPPER_FLAG_SEP ",")
+ endif ()
+endif ()
+enable_language(Fortran)
+
+
+list(APPEND CMAKE_MODULE_PATH
+ "${FLANG_RT_SOURCE_DIR}/cmake/modules"
+ "${FLANG_SOURCE_DIR}/cmake/modules"
+ )
+include(AddFlangRT)
+include(GetToolchainDirs)
+include(FlangCommon)
+include(HandleCompilerRT)
+include(ExtendPath)
+
+
+############################
+# Build Mode Introspection #
+############################
+
+# Determine whether we are in the runtimes/runtimes-bins directory of a
+# bootstrap build.
+set(LLVM_TREE_AVAILABLE OFF)
+if (LLVM_LIBRARY_OUTPUT_INTDIR AND LLVM_RUNTIME_OUTPUT_INTDIR AND PACKAGE_VERSION)
+ set(LLVM_TREE_AVAILABLE ON)
+endif()
+
+# Path to LLVM development tools (FileCheck, llvm-lit, not, ...)
+set(LLVM_TOOLS_DIR "${LLVM_BINARY_DIR}/bin")
+
+# Determine build and install paths.
+# The build path is absolute, but the install dir is relative, CMake's install
+# command has to apply CMAKE_INSTALL_PREFIX itself.
+get_toolchain_library_subdir(toolchain_lib_subdir)
+if (LLVM_TREE_AVAILABLE)
+ # In a bootstrap build emit the libraries into a default search path in the
+ # build directory of the just-built compiler. This allows using the
+ # just-built compiler without specifying paths to runtime libraries.
+ #
+ # Despite Clang in the name, get_clang_resource_dir does not depend on Clang
+ # being added to the build. Flang uses the same resource dir as clang.
+ include(GetClangResourceDir)
+ get_clang_resource_dir(FLANG_RT_OUTPUT_RESOURCE_DIR PREFIX "${LLVM_LIBRARY_OUTPUT_INTDIR}/..")
+ get_clang_resource_dir(FLANG_RT_INSTALL_RESOURCE_PATH)
+
+ extend_path(FLANG_RT_OUTPUT_RESOURCE_LIB_DIR "${FLANG_RT_OUTPUT_RESOURCE_DIR}" "${toolchain_lib_subdir}")
+else ()
+ # In a standalone runtimes build, do not write into LLVM_BINARY_DIR. It may be
+ # read-only and/or shared by multiple runtimes with different build
+ # configurations (e.g. Debug/Release). Use the runtime's own lib dir like any
+ # non-toolchain library.
+ # For the install prefix, still use the resource dir assuming that Flang will
+ # be installed there using the same prefix. This is to not have a difference
+ # between bootstrap and standalone runtimes builds.
+ set(FLANG_RT_OUTPUT_RESOURCE_DIR "${CMAKE_CURRENT_BINARY_DIR}")
+ set(FLANG_RT_INSTALL_RESOURCE_PATH "lib${LLVM_LIBDIR_SUFFIX}/clang/${LLVM_VERSION_MAJOR}")
+
+ extend_path(FLANG_RT_OUTPUT_RESOURCE_LIB_DIR "${FLANG_RT_OUTPUT_RESOURCE_DIR}" "lib${LLVM_LIBDIR_SUFFIX}")
+endif ()
+extend_path(FLANG_RT_INSTALL_RESOURCE_LIB_PATH "${FLANG_RT_INSTALL_RESOURCE_PATH}" "${toolchain_lib_subdir}")
+cmake_path(NORMAL_PATH FLANG_RT_OUTPUT_RESOURCE_DIR)
+cmake_path(NORMAL_PATH FLANG_RT_INSTALL_RESOURCE_PATH)
+cmake_path(NORMAL_PATH FLANG_RT_OUTPUT_RESOURCE_LIB_DIR)
+cmake_path(NORMAL_PATH FLANG_RT_INSTALL_RESOURCE_LIB_PATH)
+
+
+#################
+# Build Options #
+#################
+
+# Important: flang-rt user options must be prefixed with "FLANG_RT_". Variables
+# with this prefix will be forwarded in bootstrap builds.
+
+option(FLANG_RT_INCLUDE_TESTS "Generate build targets for the flang-rt unit and regression-tests." "${LLVM_INCLUDE_TESTS}")
+
+
+set(FLANG_RT_EXPERIMENTAL_OFFLOAD_SUPPORT "" CACHE STRING "Compile Flang-RT with GPU support (CUDA or OpenMP)")
+set_property(CACHE FLANG_RT_EXPERIMENTAL_OFFLOAD_SUPPORT PROPERTY STRINGS
+ ""
+ CUDA
+ OpenMP
+ )
+if (NOT FLANG_RT_EXPERIMENTAL_OFFLOAD_SUPPORT)
+ # Support for GPUs disabled
+elseif (FLANG_RT_EXPERIMENTAL_OFFLOAD_SUPPORT STREQUAL "CUDA")
+ # Support for CUDA
+ set(FLANG_RT_LIBCUDACXX_PATH "" CACHE PATH "Path to libcu++ package installation")
+ option(FLANG_RT_CUDA_RUNTIME_PTX_WITHOUT_GLOBAL_VARS "Do not compile global variables' definitions when producing PTX library" OFF)
+elseif (FLANG_RT_EXPERIMENTAL_OFFLOAD_SUPPORT STREQUAL "OpenMP")
+ # Support for OpenMP offloading
+ set(FLANG_RT_DEVICE_ARCHITECTURES "all" CACHE STRING
+ "List of OpenMP device architectures to be used to compile the Fortran runtime (e.g. 'gfx1103;sm_90')"
+ )
+
+ if (FLANG_RT_DEVICE_ARCHITECTURES STREQUAL "all")
+ # TODO: support auto detection on the build system.
+ set(all_amdgpu_architectures
+ "gfx700;gfx701;gfx801;gfx803;gfx900;gfx902;gfx906"
+ "gfx908;gfx90a;gfx90c;gfx940;gfx1010;gfx1030"
+ "gfx1031;gfx1032;gfx1033;gfx1034;gfx1035;gfx1036"
+ "gfx1100;gfx1101;gfx1102;gfx1103;gfx1150;gfx1151"
+ "gfx1152;gfx1153")
+ set(all_nvptx_architectures
+ "sm_35;sm_37;sm_50;sm_52;sm_53;sm_60;sm_61;sm_62"
+ "sm_70;sm_72;sm_75;sm_80;sm_86;sm_89;sm_90")
+ set(all_gpu_architectures
+ "${all_amdgpu_architectures};${all_nvptx_architectures}")
+ set(FLANG_RT_DEVICE_ARCHITECTURES ${all_gpu_architectures})
+ endif()
+ list(REMOVE_DUPLICATES FLANG_RT_DEVICE_ARCHITECTURES)
+else ()
+ message(FATAL_ERROR "Invalid value '${FLANG_RT_EXPERIMENTAL_OFFLOAD_SUPPORT}' for FLANG_RT_EXPERIMENTAL_OFFLOAD_SUPPORT; must be empty, 'CUDA', or 'OpenMP'")
+endif ()
+
+
+option(FLANG_RT_ENABLE_CUF "Compile CUDA Fortran runtime sources" OFF)
+if (FLANG_RT_ENABLE_CUF)
+ find_package(CUDAToolkit REQUIRED)
+endif()
+
+
+########################
+# System Introspection #
+########################
+
+include(CheckCXXSymbolExists)
+include(CheckCXXSourceCompiles)
+check_cxx_symbol_exists(strerror_r string.h HAVE_STRERROR_R)
+# Can't use symbol exists here as the function is overloaded in C++
+check_cxx_source_compiles(
+ "#include <string.h>
+ int main() {
+ char buf[4096];
+ return strerror_s(buf, 4096, 0);
+ }
+ "
+ HAVE_DECL_STRERROR_S)
+
+
+# Search for clang_rt.builtins library. Need in addition to msvcrt.
+if (WIN32)
+ find_compiler_rt_library(builtins FLANG_RT_BUILTINS_LIBRARY)
+endif ()
+
+
+# Check whether the compiler can undefine a macro using the "-U" flag.
+# Aternatively, we could use
+# CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "GNU"
+# but some older versions of CMake don't define it for GCC itself.
+check_cxx_compiler_flag("-UTESTFLAG" FLANG_RT_SUPPORTS_UNDEFINE_FLAG)
+
+
+#####################
+# Build Preparation #
+#####################
+
+if (FLANG_RT_EXPERIMENTAL_OFFLOAD_SUPPORT AND FLANG_RT_INCLUDE_TESTS)
+ # If Fortran runtime is built as CUDA library, the linking
+ # of targets that link flang-rt must be done
+ # with CUDA_RESOLVE_DEVICE_SYMBOLS.
+ # CUDA language must be enabled for CUDA_RESOLVE_DEVICE_SYMBOLS
+ # to take effect.
+ enable_language(CUDA)
+endif()
+
+
+# C++17 is required for flang-rt; user or other runtimes may override this.
+# GTest included later also requires C++17.
+set(CMAKE_CXX_STANDARD 17 CACHE STRING "C++ standard to conform to")
+set(CMAKE_CXX_STANDARD_REQUIRED YES)
+
+
+configure_file(cmake/config.h.cmake.in config.h)
+
+
+# The bootstrap build will create a phony target with the same as the top-level
+# directory ("flang-rt") and delegate it to the runtimes build dir.
+# AddFlangRT will add all non-EXCLUDE_FROM_ALL targets to it.
+add_custom_target(flang-rt)
+
+
+###################
+# Build Artifacts #
+###################
+
+add_subdirectory(lib)
+
+if (FLANG_RT_INCLUDE_TESTS)
+ add_subdirectory(unittests)
+ add_subdirectory(test)
+else ()
+ add_custom_target(check-flang-rt)
+endif()
diff --git a/flang-rt/CODE_OWNERS.TXT b/flang-rt/CODE_OWNERS.TXT
new file mode 100644
index 00000000000000..649243aa1e8fec
--- /dev/null
+++ b/flang-rt/CODE_OWNERS.TXT
@@ -0,0 +1,14 @@
+This file is a list of the people responsible for ensuring that patches for a
+particular part of Flang are reviewed, either by themself or by someone else.
+They are also the gatekeepers for their part of Flang, with the final word on
+what goes in or not.
+
+The list is sorted by surname and formatted to allow easy grepping and
+beautification by scripts. The fields are: name (N), email (E), web-address
+(W), PGP key ID and fingerprint (P), description (D), snail-mail address
+(S) and (I) IRC handle. Each entry should contain at least the (N), (E) and
+(D) fields.
+
+N: Steve Scalpone
+E: sscalpone at nvidia.com
+D: Anything not covered by others
diff --git a/flang-rt/LICENSE.TXT b/flang-rt/LICENSE.TXT
new file mode 100644
index 00000000000000..53bb2e7fbc7643
--- /dev/null
+++ b/flang-rt/LICENSE.TXT
@@ -0,0 +1,234 @@
+==============================================================================
+The LLVM Project is under the Apache License v2.0 with LLVM Exceptions:
+==============================================================================
+
+ Apache License
+ Version 2.0, January 2004
+ http://www.apache.org/licenses/
+
+ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+ 1. Definitions.
+
+ "License" shall mean the terms and conditions for use, reproduction,
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[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/110217
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