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Flang Binary Release 2019-03-29

Flang is a Fortran compiler targeting LLVM.

The source is at http://github.com/flang-compiler/.
There are 4 repositories:

  • llvm: The version of LLVM that we use to build Flang.
  • flang-driver: A Clang fork used as the basis of the Flang driver.
  • openmp: The version of OpenMP we use to buidl flang.
  • flang: The Flang compiler itself.

This binary release was created from the flang_20190329 tag of Flang.
It contains the binaries and libraries suitable for running
Flang (LLVM 7.0) on x86_64 and OpenPOWER distributions.

Community Resources

We have mailing lists for announcements and developers.
Here's the link with the sign-up information:

http://lists.flang-compiler.org/mailman/listinfo

We have a flang-compiler channel on Slack. Slack is invitation
only but anyone can join. Here's the link:

https://join.slack.com/t/flang-compiler/shared_invite/MjExOTEyMzQ3MjIxLTE0OTk4NzQyNzUtODQzZWEyMjkwYw

Installing

To install the binary release, untar the .tgz file in
a location suitable for you. Add the bin directory to
your PATH and lib directory to your LD_LIBRARY_PATH,
after which you should be able to execute Flang.

Building Your First Program

To test your installation, create a simple "hello world" program, like the
following:

   program hello
     print *, 'hello world'
   end

Next, compile the program in the following manner. We will assume the
program is in a file called hello.f90

$ flang hello.f90

If the build succeeds, then you can execute the program:

$ ./a.out

Flang Binary Release Minimum Requirements

Below are the minimum requirements to compile and run Flang:

Host Processor:
    64-bit OpenPOWER
    64-bit x86 (including AMD64 and Intel 64)

OpenPOWER Linux:
    Ubuntu 14.04, 16.04
    Red Hat Enterprise Linux 7.3, 7.4 for IBM Power (POWER8)
    Red Hat Enterprise Linux 7.4 for IBM Power LE (POWER9)

x86-64 Linux:
    CentOS 5 or newer
    OpenSuSE 11 or newer including OpenSuSE Leap 42.2
    SUSE Linux Enterprise Server (SLES) 11 or newer
    Red Hat Enterprise Linux 5 or newer
    Fedora Core 6 or newer
    Ubuntu 12.04 or newer

Flang Binary Release File List

Below is a list of files in the tar archives for x86-64 and OpenPOWER:

    bin/flang
    bin/flang1
    bin/flang2
    include/ieee_arithmetic_la.mod
    include/ieee_arithmetic.mod
    include/ieee_exceptions_la.mod
    include/ieee_exceptions.mod
    include/ieee_features.mod
    include/iso_c_binding.mod
    include/iso_fortran_env.mod
    include/omp_lib.h
    include/omp_lib_kinds.mod
    include/omp_lib.mod
    lib/libflang.a
    lib/libflang.so
    lib/libflangmain.a
    lib/libflangrti.a
    lib/libflangrti.so
    lib/libomp.a
    lib/libomp.so
    lib/libompstub.a
    lib/libompstub.so
    lib/libpgmath.a
    lib/libpgmath.so

Compiler Options

For a list of compiler options, enter

$ flang -help

The Flang compiler supports all clang 7.0 compiler options
as well as the following Flang-specific compiler options:

Option Description
-byteswapio Swap byte-order for unformatted input/output
-cpp Preprocess Fortran files
-fbackslash Treat backslash as C-style escape character
-fdefault-integer-8 Treat INTEGER and LOGICAL as INTEGER8 and LOGICAL8
-fdefault-real-8 Treat REAL as REAL*8
-ffixed-form Enable fixed-form format for Fortran
-ffixed-line-length- Set line length in fixed-form format Fortran, current supporting only 72 and 132 characters
-ffree-form Enable free-form format for Fortran
-fno-backslash Treat backslash like any other character in character strings
-fno-fixed-form Disable fixed-form format for Fortran
-fno-fortran-main Don't link in Fortran main
-fno-free-form Disable free-form format for Fortran
-Mallocatable= Select semantics for assignments to allocatables (F03 or F95)
-Minfo Diagnostic information about all successful optimizations
-Minform= Set error level of messages to display
-Minfo= Diagnostic information about successful optimizations
-Mneginfo Diagnostic information about all missed optimizations
-Mneginfo= Diagnostic information about missed optimizations
-nocpp Don't preprocess Fortran files
-no-flang-libs Do not link against Flang libraries
-static-flang-libs Link using static Flang libraries

Known Issues

See the GitHub issues list for the known issues with Flang:
http://github.com/flang-compiler/flang/issues

The following "check-flang" tests fail on OpenPOWER:

f90_correct/lit/ieee18flushz.sh
f90_correct/lit/ieee19flushz.sh
ncar_kernels/CAM5_mg2_pgi/lit/t1.sh
ncar_kernels/HOMME_vlaplace_sphere_wk/lit/t1.sh
ncar_kernels/PORT_binterp/lit/t1.sh
ncar_kernels/PORT_reftra_sw/lit/t1.sh
ncar_kernels/PORT_rtrnmc/lit/t1.sh
ncar_kernels/PORT_sw_reftra/lit/t1.sh
ncar_kernels/PORT_sw_spcvmc/lit/t1.sh
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