awarzynski updated this revision to Diff 422836.
awarzynski added a comment.
Add a flang, `-flang-experimental-exec`, to guard the new functionality.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D122008/new/
https://reviews.llvm.org/D122008
Files:
clang/include/clang/Driver/Options.td
clang/lib/Driver/ToolChains/Gnu.cpp
flang/include/flang/Runtime/stop.h
flang/runtime/CMakeLists.txt
flang/runtime/FortranMain/CMakeLists.txt
flang/runtime/FortranMain/Fortran_main.c
flang/test/CMakeLists.txt
flang/test/Driver/linker-flags.f90
Index: flang/test/Driver/linker-flags.f90
===================================================================
--- /dev/null
+++ flang/test/Driver/linker-flags.f90
@@ -0,0 +1,30 @@
+! Verify that the Fortran runtime libraries are present in the linker
+! invocation. These libraries are added on top of other standard runtime
+! libraries that the Clang driver will include.
+
+! NOTE: The additional linker flags tested here are currently specified in
+! clang/lib/Driver/Toolchains/Gnu.cpp. This makes the current implementation GNU
+! (Linux) specific. The following line will make sure that this test is skipped
+! on Windows. Ideally we should find a more robust way of testing this.
+! REQUIRES: shell
+! UNSUPPORTED: darwin, macos
+
+!------------
+! RUN COMMAND
+!------------
+! RUN: %flang -### --ld-path=/usr/bin/ld %S/Inputs/hello.f90 2>&1 | FileCheck %s
+
+!----------------
+! EXPECTED OUTPUT
+!----------------
+! Compiler invocation to generate the object file
+! CHECK-LABEL: {{.*}} "-emit-obj"
+! CHECK-SAME: "-o" "[[object_file:.*]]" {{.*}}Inputs/hello.f90
+
+! Linker invocation to generate the executable
+! CHECK-LABEL: "/usr/bin/ld"
+! CHECK-SAME: "[[object_file]]"
+! CHECK-SAME: -lFortran_main
+! CHECK-SAME: -lFortranRuntime
+! CHECK-SAME: -lFortranDecimal
+! CHECK-SAME: -lm
Index: flang/test/CMakeLists.txt
===================================================================
--- flang/test/CMakeLists.txt
+++ flang/test/CMakeLists.txt
@@ -58,6 +58,9 @@
llvm-dis
llvm-objdump
split-file
+ FortranRuntime
+ Fortran_main
+ FortranDecimal
)
if (FLANG_INCLUDE_TESTS)
Index: flang/runtime/FortranMain/Fortran_main.c
===================================================================
--- /dev/null
+++ flang/runtime/FortranMain/Fortran_main.c
@@ -0,0 +1,21 @@
+//===-- runtime/FortranMain/Fortran_main.c --------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "flang/Runtime/main.h"
+#include "flang/Runtime/stop.h"
+
+/* main entry into PROGRAM */
+void _QQmain();
+
+/* C main stub */
+int main(int argc, const char *argv[], const char *envp[]) {
+ RTNAME(ProgramStart)(argc, argv, envp);
+ _QQmain();
+ RTNAME(ProgramEndStatement)();
+ return 0;
+}
Index: flang/runtime/FortranMain/CMakeLists.txt
===================================================================
--- /dev/null
+++ flang/runtime/FortranMain/CMakeLists.txt
@@ -0,0 +1,3 @@
+llvm_add_library(Fortran_main STATIC
+ Fortran_main.c
+)
Index: flang/runtime/CMakeLists.txt
===================================================================
--- flang/runtime/CMakeLists.txt
+++ flang/runtime/CMakeLists.txt
@@ -30,6 +30,8 @@
# with different names
include_directories(AFTER ${CMAKE_CURRENT_BINARY_DIR})
+add_subdirectory(FortranMain)
+
add_flang_library(FortranRuntime
ISO_Fortran_binding.cpp
allocatable.cpp
Index: flang/include/flang/Runtime/stop.h
===================================================================
--- flang/include/flang/Runtime/stop.h
+++ flang/include/flang/Runtime/stop.h
@@ -27,7 +27,7 @@
NORETURN void RTNAME(ProgramEndStatement)(NO_ARGUMENTS);
// Extensions
-NORETURN void RTNAME(Exit)(int status = EXIT_SUCCESS);
+NORETURN void RTNAME(Exit)(int status DEFAULT_VALUE(EXIT_SUCCESS));
NORETURN void RTNAME(Abort)(NO_ARGUMENTS);
// Crash with an error message when the program dynamically violates a Fortran
Index: clang/lib/Driver/ToolChains/Gnu.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Gnu.cpp
+++ clang/lib/Driver/ToolChains/Gnu.cpp
@@ -382,6 +382,28 @@
Exec, CmdArgs, Inputs, Output));
}
+static void addFortranRuntimeLibraryPath(const ToolChain &TC,
+ const ArgList &Args,
+ ArgStringList &CmdArgs) {
+ // Default to the <driver-path>/../lib directory. This works fine on the
+ // platforms that we have tested so far. We will probably have to re-fine
+ // this in the future. In particular:
+ // * on some platforms, we may need to use lib64 instead of lib
+ // * this logic should also work on other similar platforms too, so we
+ // should move it to one of Gnu's parent tool{chain} classes
+ SmallString<256> DefaultLibPath =
+ llvm::sys::path::parent_path(TC.getDriver().Dir);
+ llvm::sys::path::append(DefaultLibPath, "lib");
+ CmdArgs.push_back(Args.MakeArgString("-L" + DefaultLibPath));
+}
+
+static void addFortranLinkerFlags(ArgStringList &CmdArgs) {
+ CmdArgs.push_back("-lFortran_main");
+ CmdArgs.push_back("-lFortranRuntime");
+ CmdArgs.push_back("-lFortranDecimal");
+ CmdArgs.push_back("-lm");
+}
+
void tools::gnutools::Linker::ConstructJob(Compilation &C, const JobAction &JA,
const InputInfo &Output,
const InputInfoList &Inputs,
@@ -668,6 +690,16 @@
}
}
+ // Additional linker set-up and flags for Fortran. This is required in order
+ // to be able to generate executables. While Flang is under active
+ // development, this is considered an "experimental" feature and guarded with a
+ // command line option.
+ // TOOD: Make this work unconditionally once Flang is mature enough.
+ if (D.IsFlangMode() && Args.hasArg(options::OPT_flang_experimental_exec)) {
+ addFortranRuntimeLibraryPath(ToolChain, Args, CmdArgs);
+ addFortranLinkerFlags(CmdArgs);
+ }
+
Args.AddAllArgs(CmdArgs, options::OPT_T);
const char *Exec = Args.MakeArgString(ToolChain.GetLinkerPath());
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -4693,6 +4693,11 @@
def fno_sycl : Flag<["-"], "fno-sycl">, Flags<[NoXarchOption, CoreOption]>,
Group<sycl_Group>, HelpText<"Disables SYCL kernels compilation for device">;
+
+def flang_experimental_exec : Flag<["-"], "flang-experimental-exec">,
+ Flags<[FlangOption, FlangOnlyOption, NoXarchOption, CoreOption]>,
+ HelpText<"Enable support for generating executables (experimental)">;
+
//===----------------------------------------------------------------------===//
// FLangOption + CoreOption + NoXarchOption
//===----------------------------------------------------------------------===//
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