---
name: "Misc.RuntimeID"
section: "3o"
platform: "linux"
package: "ocaml"
version: "5.5.0-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Misc.RuntimeID"
---

# Misc.RuntimeID(3o)

no description

## NAME

Misc.RuntimeID - no description

## Module

Module   Misc.RuntimeID

## Documentation

Module **RuntimeID**\
  :  **sig end**

Manipulation of the Runtime ID values used to mangle the filenames of shared libraries and the bytecode interpreters.

*type t* = private {\
  dev :  **bool** ;  (\*  **true** if this not an unaltered official release of OCaml\
  \*) \
  release :  **int** ;  (\* Release number (OCaml 5.5 is release 21)\
  \*) \
  reserved :  **int** ;  (\* The number of reserved bits (0-31) in the value header\
  \*) \
  no\_flat\_float\_array :  **bool** ;  (\*  **true** if float arrays must be boxed (i.e. configured with --disable-flat-float-array)\
  \*) \
  fp :  **bool** ;  (\*  **true** if frame pointers are required (i.e. configured with --enable-frame-pointers\
  \*) \
  tsan :  **bool** ;  (\*  **true** if ThreadSanitizer (TSAN) is required (i.e. configured with --enable-tsan)\
  \*) \
  int31 :  **bool** ;  (\*  **true** if the platform has 31-bit  **int** s (i.e. 32-bit systems)\
  \*) \
  static :  **bool** ;  (\*  **true** if dynamic loading of libraries is not supported\
  \*) \
  no\_compression :  **bool** ;  (\*  **true** if compressed marshalling is not supported\
  \*) \
  ansi :  **bool** ;  (\*  **true** if Unicode support on Windows is disabled\
  \*) \
  }

Runtime IDs

*val make\_zinc* :  **?dev:bool -\>** **?release:int -\>** **?no\_flat\_float\_array:bool -\>** **?int31:bool -\>** **?static:bool -\> ?no\_compression:bool -\> unit -\> t**

Returns the Zinc Runtime ID for the given parameters (using default values from  **Config** and  **Sys** as necessary)

*val make\_bytecode* :  **?dev:bool -\>** **?release:int -\>** **?reserved:int -\>** **?no\_flat\_float\_array:bool -\>** **?int31:bool -\>** **?static:bool -\>** **?no\_compression:bool -\> ?ansi:bool -\> unit -\> t**

Returns the Bytecode Runtime ID for the given parameters (using default values from  **Config** and  **Sys** as necessary)

*val make\_native* :  **?dev:bool -\>** **?release:int -\>** **?reserved:int -\>** **?no\_flat\_float\_array:bool -\>** **?fp:bool -\>** **?tsan:bool -\>** **?int31:bool -\>** **?static:bool -\>** **?no\_compression:bool -\> ?ansi:bool -\> unit -\> t**

Returns the Native Runtime ID for the given parameters (using default values from  **Config** and  **Sys** as necessary)

*val is\_zinc* :  **t -\> bool**

**is\_zinc t** is true if  **t** can be used as a Zinc Runtime ID

*val is\_bytecode* :  **t -\> bool**

**is\_bytecode t** is true if  **t** can be used as a Bytecode Runtime ID

*val is\_native* :  **t -\> bool**

**is\_native t** is true if  **t** can be used as a Native Runtime ID

*val to\_string* :  **t -\> string**

Returns the 4-character representation of a  **Misc.RuntimeID.t**

*val of\_string* :  **string -\> t option**

Converts the 4-character representation back to a  **Misc.RuntimeID.t**

*val ocamlrun* :  **string -\> t -\> string**

**ocamlrun variant runtime\_id** returns the name for the runtime for the given Zinc Runtime ID.

*val shared\_runtime* :  **?runtime\_id:t -\>** **?host:string -\> ?prefix:string -\> Sys.backend\_type -\> string**

**shared\_runtime ?runtime\_id ?host ?prefix backend** returns the name of the shared runtime for the given  **backend** .  **runtime\_id** defaults to **Misc.RuntimeID.make\_bytecode** if  **backend = Sys.Bytecode** and  **Misc.RuntimeID.make\_native** if **backend = Sys.Native** and  **host** to  **Config.target** .  **prefix** defaults to  **"-l"** and the function does not append  **Config.ext\_dll** .

e.g.  **shared\_runtime ~host:"x86\_64-pc-linux-gnu" Native**\
               **= "-lasmrun-x86\_64-pc-linux-gnu-b100"** for a default OCaml 5.5 build on a 64-bit system with shared library support and compressed marshalling.

*val stubslib* :  **?runtime\_id:t -\> ?host:string -\> string -\> string**

**stublibs ?runtime\_id ?host dllname** returns the name for the given DLL basename.  **dllname** should not include  **Config.ext\_dll** (and the result does not include it either).  **host** and  **runtime\_id** default to **Config.target** and  **Misc.RuntimeID.make\_bytecode** respectively.

e.g.  **stubslib ~host:"x86\_64-pc-linux-gnu" "dllunixbyt"**\
               **= "dllunixbyt-x86\_64-pc-linux-gnu-001b"** for a default OCaml 5.5 build on a 64-bit system with shared library support and compressed marshalling.