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[fakeflang] Also detect CMakeTestGNU.c (#210175)

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Two fixes when using CMake < 3.28 after #209482:

* In addition to `flang`, also recognize `fakeflang` to determine
whether any workaround for CMake not completely supporting Flang is
needed. `fakeflang` is used as a shim in #209482.

* For CMake < 3.24, CMake does not reognize Flang at all and tries other
methods to detect to the compiler, including the file `CMakeTestGNU.c`.
Make `fakeflang` recognize it as a probe attempt.

This should fix the
[openmp-offload-amdgpu-clang-flang](https://lab.llvm.org/buildbot/#/builders/67)
buildbot. The buildbot is currently upgrade to a newer CMake version,
and the minimum required version of CMake will become 3.31 soon.
This commit is contained in:
Michael Kruse 2026-07-17 09:01:11 +02:00 committed by GitHub
parent c571b0bd73
commit c4903855b6
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
4 changed files with 14 additions and 3 deletions
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4
flang-rt/CMakeLists.txt
View file

@ -27,7 +27,9 @@ set(FLANG_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../flang")
# LLVM's requirement is only CMake 3.20, teach CMake 3.20-3.23 how to use Flang.
if (CMAKE_VERSION VERSION_LESS "3.24")
cmake_path(GET CMAKE_Fortran_COMPILER STEM _Fortran_COMPILER_STEM)
if (_Fortran_COMPILER_STEM STREQUAL "flang-new" OR _Fortran_COMPILER_STEM STREQUAL "flang")
if (_Fortran_COMPILER_STEM STREQUAL "flang-new" OR
_Fortran_COMPILER_STEM STREQUAL "flang" OR
_Fortran_COMPILER_STEM STREQUAL "fakeflang")
include(CMakeForceCompiler)
CMAKE_FORCE_Fortran_COMPILER("${CMAKE_Fortran_COMPILER}" "LLVMFlang")

6
flang/test/Driver/fakeflang.F
View file

@ -3,6 +3,7 @@
! RUN: rm -rf %t
! RUN: mkdir -p %t
! RUN: cp %s %t/CMakeFortranCompilerId.F
! RUN: cp %s %t/CMakeTestGNU.c
! RUN: cp %s %t/compiletest.F
! RUN: cd %t
@ -18,6 +19,11 @@
! RUN: FileCheck %s --input-file=a.out --check-prefixes=CHECK,MSVC --match-full-lines
! RUN: rm a.out
! CMakeTestGNU.c is a fallback used by CMake
! RUN: fakeflang -E CMakeTestGNU.c --target=aarch64-linux-gnu 2>&1 | FileCheck %s --check-prefix=FAKEWARNING
! RUN: FileCheck %s --input-file=a.out --check-prefixes=CHECK,GNU --match-full-lines
! RUN: rm a.out
! FLANG_BOOTSTRAP_PROBE forces probe mode
! RUN: env FLANG_BOOTSTRAP_PROBE=1 fakeflang -v -c --target=x86_64-unknown-linux-gnu compiletest.F 2>&1 | FileCheck %s --check-prefix=FAKEWARNING
! RUN: FileCheck %s --input-file=a.out --check-prefixes=CHECK,GNU

3
flang/tools/fakeflang/fakeflang.cpp
View file

@ -67,7 +67,8 @@ static bool isCompilerIdProbe(llvm::ArrayRef<const char *> OrigArgs) {
return true;
return llvm::any_of(OrigArgs, [](const char *Arg) {
return llvm::sys::path::filename(Arg) == "CMakeFortranCompilerId.F";
llvm::StringRef fname = llvm::sys::path::filename(Arg);
return fname == "CMakeFortranCompilerId.F" || fname == "CMakeTestGNU.c";
});
}

4
runtimes/cmake/config-Fortran.cmake
View file

@ -90,7 +90,9 @@ if (CMAKE_Fortran_COMPILER)
# Workarounds for older versions of CMake not recognizing FLang. Hence, we
# cannot use CMAKE_Fortran_COMPILER_ID.
cmake_path(GET CMAKE_Fortran_COMPILER STEM _Fortran_COMPILER_STEM)
if (_Fortran_COMPILER_STEM STREQUAL "flang-new" OR _Fortran_COMPILER_STEM STREQUAL "flang")
if (_Fortran_COMPILER_STEM STREQUAL "flang-new" OR
_Fortran_COMPILER_STEM STREQUAL "flang" OR
_Fortran_COMPILER_STEM STREQUAL "fakeflang")
# 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 used.
if (CMAKE_VERSION VERSION_LESS "3.24")