Flang command line argument reference¶
Introduction¶
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-help,--help,/help<arg>,-help<arg>,--help<arg>¶
Display available options
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-mllvm<arg>¶
Additional arguments to forward to LLVM’s option processing
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-mmlir<arg>¶
Additional arguments to forward to MLIR’s option processing
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-module-dir<dir>,-J<arg>¶
This option specifies where to put .mod files for compiled modules. It is also added to the list of directories to be searched by an USE statement. The default is the current directory.
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-o<file>,/Fo<arg>,-Fo<arg>,--output<arg>,--output=<arg>¶
Write output to <file>
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-print-effective-triple,--print-effective-triple¶
Print the effective target triple
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-print-target-triple,--print-target-triple¶
Print the normalized target triple
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-save-temps=<arg>,--save-temps=<arg>,-save-temps(equivalent to -save-temps=cwd),--save-temps(equivalent to -save-temps=cwd)¶
Save intermediate compilation results.
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--target=<arg>,-target<arg>¶
Generate code for the given target
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--version¶
Print version information
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-x<language>,--language<arg>,--language=<arg>¶
Treat subsequent input files as having type <language>
Actions¶
The action to perform on the input.
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-E,--preprocess¶
Only run the preprocessor
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-S,--assemble¶
Only run preprocess and compilation steps
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-c,--compile¶
Only run preprocess, compile, and assemble steps
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-emit-llvm¶
Use the LLVM representation for assembler and object files
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-fsyntax-only¶
Run the preprocessor, parser and semantic analysis stages
Compilation flags¶
Flags controlling the behavior of Clang during compilation. These flags have no effect during actions that do not perform compilation.
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-Xflang<arg>¶
Pass <arg> to the flang compiler
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-std=<arg>,--std=<arg>,--std<arg>¶
Language standard to compile for
Preprocessor flags¶
Flags controlling the behavior of the Clang preprocessor.
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-D<macro>=<value>,--D<arg>,/D<arg>,-D<arg>,--define-macro<arg>,--define-macro=<arg>¶
Define <macro> to <value> (or 1 if <value> omitted)
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-P,--no-line-commands¶
Disable linemarker output in -E mode
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-U<macro>,--undefine-macro<arg>,--undefine-macro=<arg>¶
Undefine macro <macro>
Include path management¶
Flags controlling how #includes are resolved to files.
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-I<dir>,/I<dir>,-I<dir>,--include-directory<arg>,--include-directory=<arg>¶
Add directory to include search path. For C++ inputs, if there are multiple -I options, these directories are searched in the order they are given before the standard system directories are searched. If the same directory is in the SYSTEM include search paths, for example if also specified with -isystem, the -I option will be ignored
Diagnostic flags¶
Flags controlling which warnings, errors, and remarks Clang will generate. See the full list of warning and remark flags.
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-W<warning>,--extra-warnings,--warn-<arg>,--warn-=<arg>¶
Enable the specified warning
Target-independent compilation options¶
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-cpp¶
Enable predefined and command line preprocessor macros
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-falternative-parameter-statement¶
Enable the old style PARAMETER statement
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-fapprox-func,-fno-approx-func¶
Allow certain math function calls to be replaced with an approximately equivalent calculation
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-fbackslash,-fno-backslash¶
Specify that backslash in string introduces an escape character
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-fcolor-diagnostics,-fdiagnostics-color,-fno-color-diagnostics¶
Enable colors in diagnostics
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-fconvert=<arg>¶
Set endian conversion of data for unformatted files
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-fdefault-double-8¶
Set the default double precision kind to an 8 byte wide type
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-fdefault-integer-8¶
Set the default integer kind to an 8 byte wide type
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-fdefault-real-8¶
Set the default real kind to an 8 byte wide type
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-ffast-math,-fno-fast-math¶
Allow aggressive, lossy floating-point optimizations
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-ffixed-form¶
Process source files in fixed form
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-ffixed-line-length=<arg>,-ffixed-line-length-<arg>¶
Set column after which characters are ignored in typical fixed-form lines in the source file
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-ffp-contract=<arg>¶
Form fused FP ops (e.g. FMAs): fast (fuses across statements disregarding pragmas) | on (only fuses in the same statement unless dictated by pragmas) | off (never fuses) | fast-honor-pragmas (fuses across statements unless dictated by pragmas). Default is ‘fast’ for CUDA, ‘fast-honor-pragmas’ for HIP, and ‘on’ otherwise. <arg> must be ‘fast’, ‘on’, ‘off’ or ‘fast-honor-pragmas’.
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-ffree-form¶
Process source files in free form
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-fimplicit-none,-fno-implicit-none¶
No implicit typing allowed unless overridden by IMPLICIT statements
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-finput-charset=<arg>¶
Specify the default character set for source files
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-fintrinsic-modules-path<dir>¶
- This option specifies the location of pre-compiled intrinsic modules,
if they are not in the default location expected by the compiler.
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-flarge-sizes¶
Use INTEGER(KIND=8) for the result type in size-related intrinsics
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-flogical-abbreviations,-fno-logical-abbreviations¶
Enable logical abbreviations
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-fopenacc¶
Enable OpenACC
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-fopenmp,-fno-openmp¶
Parse OpenMP pragmas and generate parallel code.
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-fpass-plugin=<dsopath>¶
Load pass plugin from a dynamic shared object file (only with new pass manager).
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-freciprocal-math,-fno-reciprocal-math¶
Allow division operations to be reassociated
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-fxor-operator,-fno-xor-operator¶
Enable .XOR. as a synonym of .NEQV.
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-nocpp¶
Disable predefined and command line preprocessor macros
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-pedantic,--pedantic,-no-pedantic,--no-pedantic¶
Warn on language extensions