$ swiftc -help

swiftc_help.txt

OVERVIEW: Swift compiler

USAGE: swiftc [options] <inputs>

MODES:
  -dump-ast              Parse and type-check input file(s) and dump AST(s)
  -dump-parse            Parse input file(s) and dump AST(s)
  -dump-scope-maps <expanded-or-list-of-line:column>
                         Parse and type-check input file(s) and dump the scope map(s)
  -dump-type-refinement-contexts
                         Type-check input file(s) and dump type refinement contexts(s)
  -emit-assembly         Emit assembly file(s) (-S)
  -emit-bc               Emit LLVM BC file(s)
  -emit-executable       Emit a linked executable
  -emit-imported-modules Emit a list of the imported modules
  -emit-ir               Emit LLVM IR file(s)
  -emit-library          Emit a linked library
  -emit-object           Emit object file(s) (-c)
  -emit-sibgen           Emit serialized AST + raw SIL file(s)
  -emit-sib              Emit serialized AST + canonical SIL file(s)
  -emit-silgen           Emit raw SIL file(s)
  -emit-sil              Emit canonical SIL file(s)
  -index-file            Produce index data for a source file
  -parse                 Parse input file(s)
  -print-ast             Parse and type-check input file(s) and pretty print AST(s)
  -typecheck             Parse and type-check input file(s)

OPTIONS:
  -api-diff-data-dir <path>
                          Load platform and version specific API migration data files from <path>. Ignored if -api-diff-data-file is specified.
  -api-diff-data-file <path>
                          API migration data is from <path>
  -application-extension  Restrict code to those available for App Extensions
  -assert-config <value>  Specify the assert_configuration replacement. Possible values are Debug, Release, Unchecked, DisableReplacement.
  -continue-building-after-errors
                          Continue building, even after errors are encountered
  -debug-info-store-invocation
                          Emit the compiler invocation in the debug info.
  -disable-migrator-fixits
                          Disable the Migrator phase which automatically applies fix-its
  -driver-time-compilation
                          Prints the total time it took to execute all compilation tasks
  -dump-migration-states-dir <path>
                          Dump the input text, output text, and states for migration to <path>
  -dump-usr               Dump USR for each declaration reference
  -D <value>              Marks a conditional compilation flag as true
  -embed-bitcode-marker   Embed placeholder LLVM IR data as a marker
  -embed-bitcode          Embed LLVM IR bitcode as data
  -emit-dependencies      Emit basic Make-compatible dependencies files
  -emit-loaded-module-trace-path <path>
                          Emit the loaded module trace JSON to <path>
  -emit-loaded-module-trace
                          Emit a JSON file containing information about what modules were loaded
  -emit-module-path <path>
                          Emit an importable module to <path>
  -emit-module            Emit an importable module
  -emit-objc-header-path <path>
                          Emit an Objective-C header file to <path>
  -emit-objc-header       Emit an Objective-C header file
  -emit-public-type-metadata-accessors
                          Emit all type metadata accessors as public (deprecated: now does nothing)
  -emit-tbd-path <path>   Emit the TBD file to <path>
  -emit-tbd               Emit a TBD file
  -enforce-exclusivity=<enforcement>
                          Enforce law of exclusivity
  -fixit-all              Apply all fixits from diagnostics without any filtering
  -framework <value>      Specifies a framework which should be linked against
  -Fsystem <value>        Add directory to system framework search path
  -F <value>              Add directory to framework search path
  -gdwarf-types           Emit full DWARF type info.
  -gline-tables-only      Emit minimal debug info for backtraces only
  -gnone                  Don't emit debug info
  -g                      Emit debug info. This is the preferred setting for debugging with LLDB.
  -help                   Display available options
  -import-underlying-module
                          Implicitly imports the Objective-C half of a module
  -index-file-path <path> Produce index data for file <path>
  -index-ignore-system-modules
                          Avoid indexing system modules
  -index-store-path <path>
                          Store indexing data to <path>
  -I <value>              Add directory to the import search path
  -j <n>                  Number of commands to execute in parallel
  -L <value>              Add directory to library link search path
  -l<value>               Specifies a library which should be linked against
  -migrate-keep-objc-visibility
                          When migrating, add '@objc' to declarations that would've been implicitly visible in Swift 3
  -migrator-update-sdk    Does nothing. Temporary compatibility flag for Xcode.
  -migrator-update-swift  Does nothing. Temporary compatibility flag for Xcode.
  -module-cache-path <value>
                          Specifies the Clang module cache path
  -module-link-name <value>
                          Library to link against when using this module
  -module-name <value>    Name of the module to build
  -nostdimport            Don't search the standard library import path for modules
  -num-threads <n>        Enable multi-threading and specify number of threads
  -Onone                  Compile without any optimization
  -Osize                  Compile with optimizations and target small code size
  -Ounchecked             Compile with optimizations and remove runtime safety checks
  -output-file-map <path> A file which specifies the location of outputs
  -O                      Compile with optimizations
  -o <file>               Write output to <file>
  -parse-as-library       Parse the input file(s) as libraries, not scripts
  -parse-sil              Parse the input file as SIL code, not Swift source
  -parseable-output       Emit textual output in a parseable format
  -profile-coverage-mapping
                          Generate coverage data for use with profiled execution counts
  -profile-generate       Generate instrumented code to collect execution counts
  -profile-use=<profdata> Supply a profdata file to enable profile-guided optimization
  -remove-runtime-asserts Remove runtime safety checks.
  -Rpass-missed=<value>   Report missed transformations by optimization passes whose name matches the given POSIX regular expression
  -Rpass=<value>          Report performed transformations by optimization passes whose name matches the given POSIX regular expression
  -sanitize-coverage=<type>
                          Specify the type of coverage instrumentation for Sanitizers and additional options separated by commas
  -sanitize=<check>       Turn on runtime checks for erroneous behavior.
  -save-optimization-record-path <value>
                          Specify the file name of any generated YAML optimization record
  -save-optimization-record
                          Generate a YAML optimization record file
  -save-temps             Save intermediate compilation results
  -sdk <sdk>              Compile against <sdk>
  -serialize-diagnostics  Serialize diagnostics in a binary format
  -static-executable      Statically link the executable
  -static-stdlib          Statically link the Swift standard library
  -suppress-warnings      Suppress all warnings
  -swift-version <vers>   Interpret input according to a specific Swift language version number
  -target-cpu <value>     Generate code for a particular CPU variant
  -target <value>         Generate code for the given target
  -tools-directory <directory>
                          Look for external executables (ld, clang, binutils) in <directory>
  -use-ld=<value>         Specifies the linker to be used
  -verify-debug-info      Verify the binary representation of debug output.
  -version                Print version information and exit
  -v                      Show commands to run and use verbose output
  -warn-swift3-objc-inference-complete
                          Warn about deprecated @objc inference in Swift 3 for every declaration that will no longer be inferred as @objc in Swift 4
  -warn-swift3-objc-inference-minimal
                          Warn about deprecated @objc inference in Swift 3 based on direct uses of the Objective-C entrypoint
  -warnings-as-errors     Treat warnings as errors
  -whole-module-optimization
                          Optimize input files together instead of individually
  -working-directory <path>
                          Resolve file paths relative to the specified directory
  -Xcc <arg>              Pass <arg> to the C/C++/Objective-C compiler
  -Xlinker <value>        Specifies an option which should be passed to the linker