[#llvm-ThinLTOBitcodeWriterPass]
= xref:llvm.adoc[llvm]::ThinLTOBitcodeWriterPass
:relfileprefix: ../
:mrdocs:

Pass that prepares a module for ThinLTO and writes bitcode.

== Synopsis

Declared in `<llvm/Transforms/IPO/ThinLTOBitcodeWriter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class ThinLTOBitcodeWriterPass
    : public xref:llvm/RequiredPassInfoMixin-047.adoc[RequiredPassInfoMixin<ThinLTOBitcodeWriterPass>]
----

== Description

Modules containing type metadata are split into regular and thin LTO parts when possible and written to a multi‐module bitcode file. Modules without type metadata are written unmodified as a single module.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:llvm/RequiredPassInfoMixin-047.adoc[RequiredPassInfoMixin<ThinLTOBitcodeWriterPass>]`
| A CRTP mix‐in for passes that should not be skipped.
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/ThinLTOBitcodeWriterPass/2constructor.adoc[`ThinLTOBitcodeWriterPass`]         [.small]#[constructor]#
| Construct a ThinLTO bitcode writer that emits to `OS.`
| xref:llvm/ThinLTOBitcodeWriterPass/run.adoc[`run`] 
| Prepare module `M` for ThinLTO and write its bitcode.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/ThinLTOBitcodeWriterPass/isRequired.adoc[`isRequired`] 
| Return true; required passes cannot be skipped.
|===



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