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[flang] Remove obsolete flang-to-external-fc tool #88904

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Merged
merged 2 commits into from
Apr 19, 2024
Merged

[flang] Remove obsolete flang-to-external-fc tool #88904

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30ebd5f
Remove source file of flang-to-external-fc
mjklemm Apr 15, 2024
a48199f
Remove mention of flang-to-external-fc from the docs
mjklemm Apr 15, 2024
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20 changes: 0 additions & 20 deletions flang/docs/FlangDriver.md
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Expand Up @@ -266,26 +266,6 @@ is `ParseSyntaxOnlyAction`, which corresponds to `-fsyntax-only`. In other
words, `flang-new -fc1 <input-file>` is equivalent to `flang-new -fc1 -fsyntax-only
<input-file>`.

## The `flang-to-external-fc` script
The `flang-to-external-fc` wrapper script for `flang-new` was introduced as a
development tool and to facilitate testing. The `flang-to-external-fc` wrapper
script will:
* use `flang-new` to unparse the input source file (i.e. it will run `flang-new
-fc1 -fdebug-unparse <input-file>`), and then
* call a host Fortran compiler, e.g. `gfortran`, to compile the unparsed file.

Here's a basic breakdown of what happens inside `flang-to-external-fc` when you
run `flang-to-external-fc file.f90`:
```bash
flang-new -fc1 -fdebug-unparse file.f90 -o file-unparsed.f90
gfortran file-unparsed.f90
```
This is a simplified version for illustration purposes only. In practice,
`flang-to-external-fc` adds a few more frontend options and it also supports
various other use cases (e.g. compiling C files, linking existing object
files). `gfortran` is the default host compiler used by `flang-to-external-fc`.
You can change it by setting the `FLANG_FC` environment variable.

## Adding new Compiler Options
Adding a new compiler option in Flang consists of two steps:
* define the new option in a dedicated TableGen file,
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11 changes: 0 additions & 11 deletions flang/tools/f18/CMakeLists.txt
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Expand Up @@ -93,17 +93,6 @@ endif()

add_custom_target(module_files ALL DEPENDS ${MODULE_FILES})

# This flang shell script will only work in a POSIX shell.
if (NOT WIN32)
configure_file(
${CMAKE_CURRENT_SOURCE_DIR}/flang-to-external-fc.in
${CMAKE_BINARY_DIR}/bin/flang-to-external-fc
@ONLY
)
add_custom_target(flang-to-external-fc ALL DEPENDS ${CMAKE_BINARY_DIR}/bin/flang-to-external-fc)
install(PROGRAMS ${CMAKE_BINARY_DIR}/bin/flang-to-external-fc DESTINATION "${CMAKE_INSTALL_BINDIR}")
endif()

# TODO Move this to a more suitable location
# Copy the generated omp_lib.h header file, if OpenMP support has been configured.
if (LLVM_TOOL_OPENMP_BUILD)
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