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Flang
=====
Flang is a Fortran compiler targeting LLVM.
Visit the flang wiki for more information:
https://github.com/flang-compiler/flang/wiki
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
## Building Flang
Instructions for building Flang can be found on the Flang wiki:
https://github.com/flang-compiler/flang/wiki/Building-Flang
## Compiler Options
For a list of compiler options, enter
```
% flang -help
```
The Flang compiler supports accepts all clang 4.0 compiler options and supports many, as well as the following flang-specific compiler options:
```lang-none
-noFlangLibs Do not link against Flang libraries
-mp Enable OpenMP and link with with OpenMP library libomp
-nomp Do not link with OpenMP library libomp
-Mbackslash Treat backslash character like a C-style escape character
-Mno-backslash Treat backslash like any other character
-Mbyteswapio Swap byte-order for unformatted input/output
-Mfixed Assume fixed-format source
-Mextend Allow source lines up to 132 characters
-Mfreeform Assume free-format source
-Mpreprocess Run preprocessor for Fortran files
-Mrecursive Generate code to allow recursive subprograms
-Mstandard Check standard conformance
-Msave Assume all variables have SAVE attribute
-module path to module file (-I also works)
-Mallocatable=95 Select Fortran 95 semantics for assignments to allocatable objects (Default)
-Mallocatable=03 Select Fortran 03 semantics for assignments to allocatable objects
-static-flang-libs Link using static Flang libraries
-M[no]daz Treat denormalized numbers as zero
-M[no]flushz Set SSE to flush-to-zero mode
-Mcache_align Align large objects on cache-line boundaries
-M[no]fprelaxed This option is ignored
-fdefault-integer-8 Treat INTEGER and LOGICAL as INTEGER*8 and LOGICAL*8
-fdefault-real-8 Treat REAL as REAL*8
-i8 Treat INTEGER and LOGICAL as INTEGER*8 and LOGICAL*8
-r8 Treat REAL as REAL*8
-fno-fortran-main Don't link in Fortran main
```
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