awarzynski added inline comments.
================
Comment at: flang/test/Frontend/input-output-file.f90:6
!--------------------------
+! NOTE: We need `-E` below in order to instruct the compiler driver to create
a job representing a fronted compiler invocation
! TEST 1: Print to stdout (implicit)
----------------
SouraVX wrote:
> I didn't follow this completely, Could you please elaborate a bit.
Sorry, I'm doing a poor job documenting this here.
Basically, we want to instruct `flang-new` to stop after the preprocessing
phase. `-E` is a phase control flag. `-c` is another phase control flag. You
can also skip phase flags all together:
```
$ bin/flang-new -ccc-print-phases file.f90
+- 0: input, "file.f90", f95-cpp-input
+- 1: preprocessor, {0}, f95
+- 2: compiler, {1}, ir
+- 3: backend, {2}, assembler
+- 4: assembler, {3}, object
5: linker, {4}, image
```
As you can see, without `-E` the driver, `flang-new`, would attempt to run
multiple phases which would result in multiple compiler _jobs_. But we only
want the compiler job, i.e. we are only interested the the first phase. (IIRC,
compiler jobs map 1-1 to compiler phases).
So, `-E` is added here to make sure that `flang-new` doesn't try to do too much
here.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D96864/new/
https://reviews.llvm.org/D96864
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