|-a||Build a library (.cma file) with the object files (.cmo files) given on the command line, instead of linking them into an executable file. The name of the library must be set with the -o option.|
|If -custom, -cclib or -ccopt options are passed on the command line, these options are stored in the resulting .cma library. Then, linking with this library automatically adds back the -custom, -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 when linking in "custom runtime" mode (see the -custom option) and as the C compiler for compiling .c source files.|
|Pass the -llibname option to the C linker when linking in "custom runtime" mode (see the -custom option). This causes the given C library to be linked with the program.|
|Pass the given option to the C compiler and linker, when linking in "custom runtime" mode (see the -custom option). For instance, -ccopt -Ldir causes the C linker to search for C libraries in directory dir.|
|-compat-32||Check that the generated bytecode executable can run on 32-bit platforms and signal an error if it cannot. This is useful when compiling bytecode on a 64-bit machine.|
|-config||Print the version number of ocamlc(1) and a detailed summary of its configuration, then exit.|
Link in "custom runtime" mode. In the default linking mode, the
linker produces bytecode that is intended to be executed with the
shared runtime system,
In the custom runtime mode, the
linker produces an output file that contains both the runtime system
and the bytecode for the program. The resulting file is larger, but it
can be executed directly, even if the
command is not
installed. Moreover, the "custom runtime" mode enables linking OCaml
code with user-defined C functions.
Never use the strip(1) command on executables produced by ocamlc -custom, this would remove the bytecode part of the executable.
|Arrange for the C shared library dlllibname.so to be loaded dynamically by the run-time system ocamlrun(1) at program start-up time.|
|Adds the directory dir to the run-time search path for shared C libraries. At link-time, shared libraries are searched in the standard search path (the one corresponding to the -I option). The -dllpath option simply stores dir in the produced executable file, where ocamlrun(1) can find it and use it.|
|This option is accepted for compatibility with ocamlopt(1) ; it does nothing.|
|-g||Add debugging information while compiling and linking. This option is required in order to be able to debug the program with ocamldebug(1) and to produce stack backtraces when the program terminates on an uncaught exception.|
|-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
(.cmo), libraries (.cma), and C libraries specified with
. 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
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.|
|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 (option -a), setting the -linkall option forces all subsequent links of programs involving that library to link all the modules contained in the library.|
|Build a custom runtime system (in the file specified by option -o) incorporating the C object files and libraries given on the command line. This custom runtime system can be used later to execute bytecode executables produced with the option ocamlc -use-runtime runtime-name.|
|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 .cma libraries, ignore -custom, -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.|
|Ignore non-optional labels in types. Labels cannot be used in applications, and parameter order becomes strict.|
|Do not automatically add the standard library directory to the list of directories searched for compiled interface files (.cmi), compiled object code files (.cmo), libraries (.cma), and C libraries specified with -cclib -lxxx . See also option -I.|
|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. 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 a bytecode 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 C source file (.c extension) or a compiled shared/dynamic library (.so extension).|
|-pack||Build a bytecode object file (.cmo file) and its associated compiled interface (.cmi) that combines the object files given on the command line, making them appear as sub-modules of the output .cmo file. The name of the output .cmo file must be given with the -o option. For instance, ocamlc -pack -o p.cmo a.cmo b.cmo c.cmo generates compiled files p.cmo and p.cmi describing a compilation unit having three sub-modules A, B and C, corresponding to the contents of the object files a.cmo, b.cmo and c.cmo. These contents can be referenced as P.A, P.B and P.C in the remainder of the program.|
|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. The name of this file is built from the basename of the source file with the extension .ppi for an interface (.mli) file and .ppo for an implementation (.ml) file.|
|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. When using labelled arguments and/or polymorphic methods, this flag is required to ensure future versions of the compiler will be able to infer types correctly, even if internal algorithms change. All programs accepted in -principal mode are also accepted in the default mode with equivalent types, but different binary signatures, and this may slow down type checking; yet it is a good idea to use it once before publishing source code.|
|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.|
|Enforce the separation between types string and bytes, thereby making strings read-only. This will become the default in a future version of OCaml.|
|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.|
|Force the left-hand part of each sequence to 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 slightly faster, but unsafe: anything can happen if the program accesses an array or string outside of its bounds.|
|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.|
|Generate a bytecode executable file that can be executed on the custom runtime system runtime-name, built earlier with ocamlc -make-runtime runtime-name.|
|-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 C compiler and linker in -custom mode. Useful to debug C library problems.|
|Compile or link multithreaded programs, in combination with the VM-level threads library described in The OCaml users manual.|
|-vnum or -version|
|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
Each warning can be enabled or disabled, and each warning can be fatalor non-fatal. If a warning is disabled, it isnt displayed and doesnt affect compilation in any way (even if it is fatal). If a warning is enabled, it is displayed normally by the compiler whenever the source code triggers it. If it is enabled and fatal, the compiler will also stop with an error after displaying it.
The warning-list argument is a sequence of warning specifiers, with no separators between them. A warning specifier is one of the following:
+num Enable warning number num.
-num Disable warning number num.
@num Enable and mark as fatal warning number num.
+num1..num2 Enable all warnings between num1 and num2 (inclusive).
-num1..num2 Disable all warnings between num1 and num2 (inclusive).
@num1..num2 Enable and mark as fatal all warnings between num1 and num2 (inclusive).
+letter Enable the set of warnings corresponding to letter. The letter may be uppercase or lowercase.
-letter Disable the set of warnings corresponding to letter. The letter may be uppercase or lowercase.
@letter Enable and mark as fatal the set of warnings corresponding to letter. The letter may be uppercase or lowercase.
uppercase-letter Enable the set of warnings corresponding to uppercase-letter.
lowercase-letter Disable the set of warnings corresponding to lowercase-letter.
The warning numbers are as follows.
1 Suspicious-looking start-of-comment mark.
2 Suspicious-looking end-of-comment mark.
3 Deprecated feature.
4 Fragile pattern matching: matching that will remain complete even if additional constructors are added to one of the variant types matched.
5 Partially applied function: expression whose result has function type and is ignored.
6 Label omitted in function application.
7 Method overridden without using the "method!" keyword
8 Partial match: missing cases in pattern-matching.
9 Missing fields in a record pattern.
10 Expression on the left-hand side of a sequence that doesnt have type unit (and that is not a function, see warning number 5).
11 Redundant case in a pattern matching (unused match case).
12 Redundant sub-pattern in a pattern-matching.
13 Override of an instance variable.
14 Illegal backslash escape in a string constant.
15 Private method made public implicitly.
16 Unerasable optional argument.
17 Undeclared virtual method.
18 Non-principal type.
19 Type without principality.
20 Unused function argument.
21 Non-returning statement.
22 Preprocessor warning.
23 Useless record with clause.
24 Bad module name: the source file name is not a valid OCaml module name.
25 Pattern-matching with all clauses guarded.
26 Suspicious unused variable: unused variable that is bound with let or as, and doesnt start with an underscore (_) character.
27 Innocuous unused variable: unused variable that is not bound with let nor as, and doesnt start with an underscore (_) character.
28 A pattern contains a constant constructor applied to the underscore (_) pattern.
29 A non-escaped end-of-line was found in a string constant. This may cause portability problems between Unix and Windows.
30 Two labels or constructors of the same name are defined in two mutually recursive types.
31 A module is linked twice in the same executable.
32 Unused value declaration.
33 Unused open statement.
34 Unused type declaration.
35 Unused for-loop index.
36 Unused ancestor variable.
37 Unused constructor.
38 Unused extension constructor.
39 Unused rec flag.
40 Constructor or label name used out of scope.
41 Ambiguous constructor or label name.
42 Disambiguated constructor or label name.
43 Nonoptional label applied as optional.
44 Open statement shadows an already defined identifier.
45 Open statement shadows an already defined label or constructor.
46 Error in environment variable.
47 Illegal attribute payload.
48 Implicit elimination of optional arguments.
49 Missing cmi file when looking up module alias.
50 Unexpected documentation comment.
The letters stand for the following sets of warnings. Any letter not mentioned here corresponds to the empty set.
A all warnings
C 1, 2
K 32, 33, 34, 35, 36, 37, 38, 39
U 11, 12
X 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 30
|The default setting is -w +a-4-6-7-9-27-29-32..39-41-42-44-45-48-50. Note that warnings 5 and 10 are not always triggered, depending on the internals of the type checker.|
Mark as errors 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.
ocamlopt(1), ocamlrun(1), ocaml(1).
The OCaml users manual, chapter "Batch compilation".