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3.3 Options Summary |
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Function |
Option Flag |
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Accept OpenMP API directives. The -xopenmp option flag accepts the |
-xopenmp[=keyword] |
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following sub-option keywords: parallel, noopt, and none. |
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Recognize reduction operations in loops with automatic parallelization |
-reduction |
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Verbose parallelization messages |
-vpara |
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Specify that the application will be run in situations where many |
-xthroughput |
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processes are simultaneously running on the system |
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Source Code: |
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Define preprocessor symbol |
-Dname[=val] |
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Undefine preprocessor symbol |
-Uname |
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Accept extended (250 character) source lines |
-e |
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Apply preprocessor to .F and/or .F90 and .F95 files but do not compile |
-F |
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Accept Fortran 95 fixed-format input |
-fixed |
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Preprocess all source files with the fpp preprocessor |
-fpp |
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Accept Fortran 95 free-format input |
-free |
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Add directory to include file search path |
-Ipath |
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Add directory to module search path |
-Mpath |
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Recognize upper and lower case as distinct |
-U |
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Tread hollerith as character in actual arguments |
-xhasc={yes|no} |
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Select preprocessor, cpp or fpp, to use |
-xpp[={fpp|cpp}] |
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Allow recursive subprogram calls |
-xrecursive |
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Target Platform: |
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Specify data type model, 32 or 64 bits. |
-m32 | —m64 |
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Specify target platform instruction set for the optimizer |
-xarch=a |
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Specify target cache properties for optimizer |
-xcache=a |
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Specify target processor for the optimizer |
-xchip=a |
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Specify target platform for the optimizer |
-xtarget=a |
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3.3.1Commonly Used Options
The compiler has many features that are selectable by optional command–line parameters. The short list below of commonly used options is a good place to start.
TABLE 6 |
Commonly Used Options |
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|
|
Action |
|
Option |
|
|
|
Debug—produce additional symbol table information to enable the dbx and debugging. |
–g |
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|
Chapter 3 • Fortran Compiler Options |
51 |
3.3 Options Summary
Action |
Option |
|
|
Performance—invoke the optimizer to produce faster running programs. |
–O[n] |
|
|
Performance—Produce efficient compilation and run times for the native platform, using a set of |
–fast |
predetermined options. |
|
|
|
Dynamic (–Bdynamic) or static (–Bstatic) library binding. |
–Bx |
|
|
Compile only—Suppress linking; make a .o file for each source file. |
–c |
|
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Output file—Name the executable output file nm instead of a.out. |
–o nm |
|
|
Source code—Compile fixed format Fortran source code. |
-fixed |
|
|
3.3.2Macro Flags
Some option flags are macros that expand into a specific set of other flags. These are provided as a convenient way to specify a number of options that are usually expressed together to select a certain feature.
TABLE 7 |
Macro Option Flags |
|
|
|
|
Option Flag |
|
Expansion |
|
|
|
-dalign |
|
-xmemalign=8s -aligncommon=16 |
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|
-f |
|
-aligncommon=16 |
|
|
|
-fast |
|
See description of —fast for complete current expansion. |
|
|
|
-fnonstd |
|
-fns -ftrap=common |
|
|
|
-xtarget |
|
-xarch=a -xcache=b -xchip=c |
|
|
|
Settings that follow the macro flag on the command line override or add to the expansion of the macro.
3.3.3Backward Compatibility and Legacy Options
The following options are provided for backward compatibility with earlier compiler releases, and certain Fortran legacy capabilities.
TABLE 8 |
Backward Compatibility Options |
|
|
|
|
Action |
|
Option |
|
|
|
Preserve actual arguments over ENTRY statements |
-arg=local |
|
|
|
|
52 Oracle Developer Studio 12.6: Fortran User's Guide • July 2017
|
|
3.3 Options Summary |
|
|
|
|
|
|
|
Action |
Option |
|
|
|
|
Allow assignment to constant arguments. |
–copyargs |
|
|
|
|
Treat hollerith constant as character or typeless in call argument lists. |
-xhasc[={yes|no}] |
|
|
|
|
Support Fortran 77 extensions and conventions |
-f77 |
|
|
|
|
Nonstandard arithmetic—allow nonstandard arithmetic. |
–fnonstd |
|
|
|
|
Optimize performance for the host system. |
–native |
|
|
|
|
DO loops—use one trip DO loops. |
–onetrip |
|
|
|
|
Allow legacy aliasing situations |
-xalias=keywords |
|
|
|
Use of these option flags is not recommended for producing portable Fortran programs.
3.3.4Obsolete Option Flags
The following options are considered obsolete and should not be used. They might be removed from later releases of the compiler.
TABLE 9 |
Obsolete f95 Options |
|
|
|
|
Option Flag |
|
Equivalent |
|
|
|
-native |
|
-xtarget=native |
|
|
|
-p |
|
Profiling. Use -pg or the Performance Analyzer |
|
|
|
-silent |
|
Ignored. |
|
|
|
-xarch=pentium_pro |
Obsolete. Use -xarch=generic instead. |
|
|
|
|
-xarch=sse |
|
Obsolete. Use -xarch=generic instead. |
|
|
|
-xarch=amdfam10 |
Obsolete. |
|
|
|
|
-xchip=T3 |
|
Obsolete. |
|
|
|
-xchip=pentium |
|
Obsolete. Use -xchip=generic instead. |
|
|
|
-xchip=pentium_pro |
Obsolete. Use -xchip=generic instead. |
|
|
|
|
-xchip=pentium3 |
Obsolete. Use -xchip=generic instead. |
|
|
|
|
-xchip=ultraT1 |
|
Obsolete. |
|
|
|
-xchip=ultraT2 |
|
Obsolete. |
|
|
|
-xchip=ultraT2plus |
Obsolete. |
|
|
|
|
-xchip=sparc64vi |
Obsolete. |
|
|
|
|
-xchip=sparc64vii |
Obsolete. |
|
|
|
|
-xpentium |
|
Obsolete. Use -xchip=generic instead. |
|
|
|
Chapter 3 • Fortran Compiler Options |
53 |