lfortran - Man Page

lfortran Options [files...] [SUBCOMMAND]

LFortran is a modern interactive Fortran compiler based on LLVM.

• -h, --help: Print this help message and exit
• -S: Emit assembly, do not assemble or link
• -c: Compile and assemble, do not link
• -o TEXT: Specify the file to place the compiler’s output into
• -v: Be more verbose
• -E: Preprocess only; do not compile, assemble, or link
• -l TEXT ...: Link library option
• -L TEXT ...: Library path option
• -I TEXT ...: Include path
• -J TEXT: Where to save mod files
• -g: Compile with debugging information
• --debug-with-line-column: Convert the linear location info into line + column in the debugging information
• -D TEXT ...: Define <macro>=<value> (or 1 if <value> omitted)
• --version: Display compiler version information
• -W TEXT ...: Linker flags
• -f TEXT ...: All -f* flags (only -fPIC supported for now)
• --cpp: Enable C preprocessing
• --fixed-form: Use fixed form Fortran source parsing
• --fixed-form-infer: Use heuristics to infer if a file is in fixed form
• --no-prescan: Turn off prescan
• --show-prescan: Show tokens for the given file and exit
• --show-tokens: Show tokens for the given file and exit
• --show-ast: Show AST for the given file and exit
• --show-asr: Show ASR for the given file and exit
• --with-intrinsic-mods: Show intrinsic modules in ASR
• --show-ast-f90: Show Fortran from AST for the given file and exit
• --no-color: Turn off colored AST/ASR
• --no-indent: Turn off Indented print ASR/AST
• --tree: Tree structure print ASR/AST
• --json: Print ASR/AST Json format
• --clojure: Print ASR in clojure format
• --no-loc: Skip location information in ASR/AST Json format
• --visualize: Print ASR/AST Visualization
• --pass TEXT: Apply the ASR pass and show ASR (implies –show-asr)
• --skip-pass TEXT: Skip an ASR pass in the default pipeline
• --show-llvm: Show LLVM IR for the given file and exit
• --show-cpp: Show C++ translation source for the given file and exit
• --show-c: Show C translation source for the given file and exit
• --show-asm: Show assembly for the given file and exit
• --show-wat: Show WAT (WebAssembly Text Format) and exit
• --show-julia: Show Julia translation source for the given file and exit
• --show-fortran: Show Fortran translation source for the given file and exit
• --show-stacktrace: Show internal stacktrace on compiler errors
• --symtab-only: Only create symbol tables in ASR (skip executable stmt)
• --time-report: Show compilation time report
• --static: Create a static executable
• --no-warnings: Turn off all warnings
• --no-error-banner: Turn off error banner
• --error-format TEXT=human: Control how errors are produced (human, short)
• --backend TEXT=llvm: Select a backend (llvm, cpp, x86, wasm, fortran)
• --openmp: Enable OpenMP
• --separate-compilation: Generate object code into .o files
• --rtlib: Include the full runtime library in the LLVM output
• --use-loop-variable-after-loop: Allow using loop variable after the loop
• --fast: Best performance (disable strict standard compliance)
• --link-with-gcc: Calls GCC for linking instead of clang
• --target TEXT: Generate code for the given target
• --print-targets: Print the registered targets
• --implicit-typing: Allow implicit typing
• --implicit-interface: Allow implicit interface
• --implicit-argument-casting: Allow implicit argument casting
• --print-leading-space: Print leading white space if format is unspecified
• --interactive-parse: Use interactive parse
• --verbose: Print debugging statements
• --dump-all-passes: Apply all the passes and dump the ASR into a file
• --dump-all-passes-fortran: Apply all passes and dump the ASR after each pass into a Fortran file
• --cumulative: Apply all the passes cumulatively till the given pass
• --realloc-lhs: Reallocate left-hand side automatically
• --module-mangling: Mangles the module name
• --global-mangling: Mangles all the global symbols
• --intrinsic-mangling: Mangles all the intrinsic symbols
• --all-mangling: Mangles all possible symbols
• --bindc-mangling: Mangles functions with ABI bind(c)
• --apply-fortran-mangling: Mangle symbols with Fortran supported syntax
• --mangle-underscore: Mangles with underscore
• --legacy-array-sections: Enables passing array items as sections if required
• --ignore-pragma: Ignores all the pragmas
• --stack-arrays: Allocate memory for arrays on stack

• fmt: Format Fortran source files.
• kernel: Run in Jupyter kernel mode.
• mod: Fortran mod file utilities.
• pywrap: Python wrapper generator

For more information, visit the official LFortran documentation at https://docs.lfortran.org/.