| IBM xlf90 | Meaning |
| File Handling Options |
| -c |
compile to .o files but do not link to build an executable |
| -o |
name executable output file |
| -S |
produce assembler source output file |
| -I |
specify directory to search for module files (.mod) |
| -I |
specify directory to search for #include files |
| -L, -l |
specify directory to search for libraries |
| Source File Options |
| -qsuffix=f=f90 |
Use .f90 filename extension for Fortran source code files |
| (default) |
Use .f filename extension for Fortran source code files |
| -qlanglavl=90std |
warn of nonstandard language usage |
| -k, -qfree
| expect free-form (fortran 90) source input |
| -qfixed |
expect fixed-form (fortran 77) source input |
| -qfixed=72|80|132 |
specifies 72,80, or 132-column source input form |
| -u |
specifies no implicit data typing ("implicit none") |
| Source Preprocessing |
|---|
| -qsuffix=cpp=F90 |
Invoke preprocessor first on .F90 filename
extension for Fortran source code files |
| (default) |
Invoke preprocessor first on .F filename
extension for Fortran source code files |
| -Wf,-Didentifier |
Define variables used for source preprocessing |
| Message Output Options |
| -w |
suppress all compiler messages except errors |
| -qsource |
produce source code listing |
| -qflag={I,L,W,E,S,U} |
specify level of message output (in source list, for IBM) |
| -V,-v |
verbose output from compiler, showing progress of each phase |
| -qreport=smplist |
feedback from parallelization process |
| Runtime Checking Options |
| -C |
run-time checking of array bounds |
| -qextchk |
argument or procedure interface checking (runtime, for f90; will not work for MPI codes) |
| Code Generation Options |
| -1 |
execute all do-loops at least once (Fortran-IV compatibility) |
| -qinitauto |
initialize all local variables to zero |
| -qrecur |
compile for recursive subroutine calling |
| -qfloat=rndsngl |
compile for IEEE-conformant arithmetic |
| Profiling Options |
| -p, -pg |
compile with support for profiling |
| Optimization Options |
| -O{2-5} |
specifies optimization level |
| -g |
compile for debugging |
| -qsave |
make all local storage static |
| -qsmp=nested_par |
orders automatic parallelization optimizations |
