Build a library (.cmxa/.a file) with the object files (.cmx/.o
files) given on the command line, instead of linking them into an
executable file. The name of the library must be set with the
If -cclib or -ccopt options are passed on the command line, these options are stored in the resulting .cmxa library. Then, linking with this library automatically adds back the -cclib and -ccopt options as if they had been provided on the command line, unless the -noautolink option is given. Additionally, a substring $CAMLORIGIN inside a -ccopt options will be replaced by the full path to the .cma library, excluding the filename.
|-absname||Show absolute filenames in error messages.|
|-annot||Dump detailed information about the compilation (types, bindings, tail-calls, etc). The information for file src.ml is put into file src.annot. In case of a type error, dump all the information inferred by the type-checker before the error. The src.annot file can be used with the emacs commands given in emacs/caml-types.el to display types and other annotations interactively.|
|-bin-annot||Dump detailed information about the compilation (types, bindings, tail-calls, etc) in binary format. The information for file src.ml is put into file src.cmt. In case of a type error, dump all the information inferred by the type-checker before the error. The annotation files produced by -bin-annot contain more information and are much more compact than the files produced by -annot.|
|-c||Compile only. Suppress the linking phase of the compilation. Source code files are turned into compiled files, but no executable file is produced. This option is useful to compile modules separately.|
|-cc ccomp||Use ccomp as the C linker called to build the final executable and as the C compiler for compiling .c source files.|
|Pass the -llibname option to the linker. This causes the given C library to be linked with the program.|
|Pass the given option to the C compiler and linker. For instance, -ccopt -Ldir causes the C linker to search for C libraries in directory dir.|
|-compact||Optimize the produced code for space rather than for time. This results in smaller but slightly slower programs. The default is to optimize for speed.|
|-config||Print the version number of ocamlopt(1) and a detailed summary of its configuration, then exit.|
|Generate an object file (.cmx and .o files) that can later be included as a sub-module (with the given access path) of a compilation unit constructed with -pack. For instance, ocamlopt -for-pack P -c A.ml will generate a.cmx and a.o files that can later be used with ocamlopt -pack -o P.cmx a.cmx.|
|-g||Add debugging information while compiling and linking. This option is required in order to produce stack backtraces when the program terminates on an uncaught exception (see ocamlrun(1)).|
|-i||Cause the compiler to print all defined names (with their inferred types or their definitions) when compiling an implementation (.ml file). No compiled files (.cmo and .cmi files) are produced. This can be useful to check the types inferred by the compiler. Also, since the output follows the syntax of interfaces, it can help in writing an explicit interface (.mli file) for a file: just redirect the standard output of the compiler to a .mli file, and edit that file to remove all declarations of unexported names.|
Add the given directory to the list of directories searched for
compiled interface files (.cmi), compiled object code files (.cmx),
and libraries (.cmxa). By default, the current directory is searched
first, then the standard library directory. Directories added with -I
are searched after the current directory, in the order in which they
were given on the command line, but before the standard library
directory. See also option
If the given directory starts with +, it is taken relative to the standard library directory. For instance, -I +compiler-libs adds the subdirectory compiler-libs of the standard library to the search path.
|Compile the file filename as an implementation file, even if its extension is not .ml.|
|-inline n||Set aggressiveness of inlining to n, where n is a positive integer. Specifying -inline 0 prevents all functions from being inlined, except those whose body is smaller than the call site. Thus, inlining causes no expansion in code size. The default aggressiveness, -inline 1, allows slightly larger functions to be inlined, resulting in a slight expansion in code size. Higher values for the -inline option cause larger and larger functions to become candidate for inlining, but can result in a serious increase in code size.|
|Compile the file filename as an interface file, even if its extension is not .mli.|
|Recognize file names ending with string as interface files (instead of the default .mli).|
|Keep documentation strings in generated .cmi files.|
|Keep locations in generated .cmi files.|
|-labels||Labels are not ignored in types, labels may be used in applications, and labelled parameters can be given in any order. This is the default.|
|-linkall||Force all modules contained in libraries to be linked in. If this flag is not given, unreferenced modules are not linked in. When building a library (-a flag), setting the -linkall flag forces all subsequent links of programs involving that library to link all the modules contained in the library.|
|Do not record dependencies for module aliases.|
|Deactivates the applicative behaviour of functors. With this option, each functor application generates new types in its result and applying the same functor twice to the same argument yields two incompatible structures.|
|Do not compile assertion checks. Note that the special form assert false is always compiled because it is typed specially. This flag has no effect when linking already-compiled files.|
|When linking .cmxa libraries, ignore -cclib and -ccopt options potentially contained in the libraries (if these options were given when building the libraries). This can be useful if a library contains incorrect specifications of C libraries or C options; in this case, during linking, set -noautolink and pass the correct C libraries and options on the command line.|
|Allow the compiler to use some optimizations that are valid only for code that is never dynlinked.|
|Do not automatically add the standard library directory the list of directories searched for compiled interface files (.cmi), compiled object code files (.cmx), and libraries (.cmxa). See also option -I.|
|Ignore non-optional labels in types. Labels cannot be used in applications, and parameter order becomes strict.|
|Specify the name of the output file produced by the linker. The default output name is a.out, in keeping with the Unix tradition. If the -a option is given, specify the name of the library produced. If the -pack option is given, specify the name of the packed object file produced. If the -output-obj option is given, specify the name of the output file produced. If the -shared option is given, specify the name of plugin file produced. This can also be used when compiling an interface or implementation file, without linking, in which case it sets the name of the cmi or cmo file, and also sets the module name to the file name up to the first dot.|
|Opens the given module before processing the interface or implementation files. If several -open options are given, they are processed in order, just as if the statements open! module1;; ... open! moduleN;; were added at the top of each file.|
|Cause the linker to produce a C object file instead of an executable file. This is useful to wrap OCaml code as a C library, callable from any C program. The name of the output object file must be set with the -o option. This option can also be used to produce a compiled shared/dynamic library (.so extension).|
Generate extra code to write profile information when the program is
executed. The profile information can then be examined with the
-p option must be given both at
compile-time and at link-time. Linking object files not compiled with
-p is possible, but results in less precise profiling.
See the gprof(1) man page for more information about the profiles.
Full support for gprof(1) is only available for certain platforms (currently: Intel x86/Linux and Alpha/Digital Unix). On other platforms, the -p option will result in a less precise profile (no call graph information, only a time profile).
Build an object file (.cmx and .o files) and its associated compiled
interface (.cmi) that combines the .cmx object
files given on the command line, making them appear as sub-modules of
the output .cmx file. The name of the output .cmx file must be
given with the
-o option. For instance,
ocamlopt -pack -o P.cmx A.cmx B.cmx C.cmx generates compiled files P.cmx, P.o and P.cmi describing a
compilation unit having three sub-modules A, B and C,
corresponding to the contents of the object files A.cmx, B.cmx and
C.cmx. These contents can be referenced as P.A, P.B and P.C
in the remainder of the program.
The .cmx object files being combined must have been compiled with the appropriate -for-pack option. In the example above, A.cmx, B.cmx and C.cmx must have been compiled with ocamlopt -for-pack P.
Multiple levels of packing can be achieved by combining -pack with -for-pack. See The OCaml users manual, chapter "Native-code compilation" for more details.
|Cause the compiler to call the given command as a preprocessor for each source file. The output of command is redirected to an intermediate file, which is compiled. If there are no compilation errors, the intermediate file is deleted afterwards.|
|After parsing, pipe the abstract syntax tree through the preprocessor command. The module Ast_mapper(3) implements the external interface of a preprocessor.|
|Check information path during type-checking, to make sure that all types are derived in a principal way. All programs accepted in -principal mode are also accepted in default mode with equivalent types, but different binary signatures.|
|Allow arbitrary recursive types during type-checking. By default, only recursive types where the recursion goes through an object type are supported. Note that once you have created an interface using this flag, you must use it again for all dependencies.|
|Add suffix to the name of the runtime library that will be used by the program. If OCaml was configured with option -with-debug-runtime, then the d suffix is supported and gives a debug version of the runtime.|
|-S||Keep the assembly code produced during the compilation. The assembly code for the source file x.ml is saved in the file x.s.|
|Enforce the separation between types string and bytes, thereby making strings read-only. This will become the default in a future version of OCaml.|
|-shared||Build a plugin (usually .cmxs) that can be dynamically loaded with the Dynlink module. The name of the plugin must be set with the -o option. A plugin can include a number of OCaml modules and libraries, and extra native objects (.o, .a files). Building native plugins is only supported for some operating system. Under some systems (currently, only Linux AMD 64), all the OCaml code linked in a plugin must have been compiled without the -nodynlink flag. Some constraints might also apply to the way the extra native objects have been compiled (under Linux AMD 64, they must contain only position-independent code).|
|When a type is visible under several module-paths, use the shortest one when printing the types name in inferred interfaces and error and warning messages.|
|The left-hand part of a sequence must have type unit.|
|-thread||Compile or link multithreaded programs, in combination with the system threads library described in The OCaml users manual.|
|-unsafe||Turn bound checking off for array and string accesses (the v.(i)ands.[i] constructs). Programs compiled with -unsafe are therefore faster, but unsafe: anything can happen if the program accesses an array or string outside of its bounds. Additionally, turn off the check for zero divisor in integer division and modulus operations. With -unsafe, an integer division (or modulus) by zero can halt the program or continue with an unspecified result instead of raising a Division_by_zero exception.|
|Identify the types string and bytes, thereby making strings writable. For reasons of backward compatibility, this is the default setting for the moment, but this will change in a future version of OCaml.|
|-v||Print the version number of the compiler and the location of the standard library directory, then exit.|
|-verbose||Print all external commands before they are executed, in particular invocations of the assembler, C compiler, and linker.|
|-version or -vnum|
|Print the version number of the compiler in short form (e.g. "3.11.0"), then exit.|
|Enable, disable, or mark as fatal the warnings specified by the argument warning-list. See ocamlc(1) for the syntax of warning-list.|
Mark as fatal the warnings specified in the argument
warning-list. The compiler will stop with an error when one of these
warnings is emitted. The
warning-list has the same meaning as for
-w option: a
+ sign (or an uppercase letter) marks the corresponding warnings as fatal, a
- sign (or a lowercase letter) turns them back into non-fatal warnings, and a
@ sign both enables and marks as fatal the corresponding warnings.
Note: it is not recommended to use the -warn-error option in production code, because it will almost certainly prevent compiling your program with later versions of OCaml when they add new warnings or modify existing warnings.
The default setting is -warn-error -a (all warnings are non-fatal).
|-warn-help||Show the description of all available warning numbers.|
|-where||Print the location of the standard library, then exit.|
|- file||Process file as a file name, even if it starts with a dash (-) character.|
|-help or --help|
Display a short usage summary and exit.
The IA32 code generator (Intel Pentium, AMD Athlon) supports the following additional option:
-ffast-math Use the IA32 instructions to compute trigonometric and exponential functions, instead of calling the corresponding library routines. The functions affected are: atan, atan2, cos, log, log10, sin, sqrt and tan. The resulting code runs faster, but the range of supported arguments and the precision of the result can be reduced. In particular, trigonometric operations cos, sin, tan have their range reduced to [-2^64, 2^64].
The AMD64 code generator (64-bit versions of Intel Pentium and AMD Athlon) supports the following additional options:
-fPIC Generate position-independent machine code. This is the default. -fno-PIC Generate position-dependent machine code.
The Sparc code generator supports the following additional options:
The default is to generate code for SPARC version 7, which runs on all SPARC processors.
-march=v8 Generate SPARC version 8 code. -march=v9 Generate SPARC version 9 code.
The ARM code generator supports the following additional options:
The default values for target architecture, floating-point hardware and thumb usage were selected at configure-time when building ocamlopt itself. This configuration can be inspected using ocamlopt -config. Target architecture depends on the "model" setting, while floating-point hardware and thumb support are determined from the ABI setting in "system" ( linux_eabiorlinux_eabihf).
-farch=armv4|armv5|armv5te|armv6|armv6t2|armv7 Select the ARM target architecture -ffpu=soft|vfpv2|vfpv3-d16|vfpv3 Select the floating-point hardware -fPIC Generate position-independent machine code. -fno-PIC Generate position-dependent machine code. This is the default. -fthumb Enable Thumb/Thumb-2 code generation -fno-thumb Disable Thumb/Thumb-2 code generation
The OCaml users manual, chapter "Native-code compilation".