Add support for LLVM Flang #19
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Hello! 👋🏻 Given the "maturity" of LLVM Flang, this might be a bit too early for this change. I wasn't sure, so have created this PR hoping for some early feedback. What do you think? Btw, all the steps for building SNAP with LLVM Flang are summarised here: flang-compiler/f18-llvm-project#1341 Thank you! |
LLVM Flang is the new Fortran frontend from LLVM. It is still work-in-progress, but there is enough support for Fortran 95/03 and OpenMP to compile and run SNAP. To enable this, a new target is defined in Makefile (`fsnap`) that corresponds to SNAP being built with LLVM Flang. LLVM Flang is under active development and it is assumed that you will be building it from sources in order to compile SNAP. For this reason, no assumptions are being made with respect to where to locate it (this is in contrast to regular system compilers which are usually available through $PATH). Instead, you will have point Makefile to it through the `LLVM_FLANG_DIR` variable. You will also have to specify where to find PGMATH, which LLVM Flang currently depends on for Math routines. You will specify this with `PGM_DIR`. Last, but not least, the LLVM Flang compiler driver is currently called `flang-new`. This is likely to change in the near future at which point the build script will have to be updated accordingly. Co-authored-by: Mats Petersson <mats.petersson@arm.com>
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There's been no review for over a year, so closing. Please feel free to re-use this if you need it. |
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LLVM Flang is the new Fortran frontend from LLVM. It is still
work-in-progress, but there is enough support for Fortran 95/03 and
OpenMP to compile and run SNAP. To enable this, a new target is defined
in Makefile (
fsnap) that corresponds to SNAP being built with LLVMFlang.
LLVM Flang is under active development and it is assumed that you will
be building it from sources in order to compile SNAP. For this reason,
no assumptions are being made with respect to where to locate it (this
is in contrast to regular system compilers which are usually available
through $PATH). Instead, you will have point Makefile to it through the
LLVM_FLANG_DIRvariable.You will also have to specify where to find PGMATH, which LLVM Flang
currently depends on for Math routines. You will specify this with
PGM_DIR.Last, but not least, the LLVM Flang compiler driver is currently called
flang-new. This is likely to change in the near future at which pointthe build script will have to be updated accordingly.
Co-authored-by: Mats Petersson mats.petersson@arm.com