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Config file reference

cxgo uses a YAML config file called cxgo.yml. For a usage example, see this section.

root

Specifies the root directory of C source that will be transpiled. All file names in files are relative to this directory.

Directory can be specified as a relative path, in which case it will be resolved based on the config file path.

In case vcs is specified, relative path will be resolved relative to a VCS root (e.g. Git repository root).

vcs

Instead of specifying a local directory with C files, it's also possible to add a Git repository URL. cxgo will automatically clone the project before transpiling.

See also: branch, root.

branch

If vcs key is used, specifies the branch which will be cloned.

out

Specifies the output path for Go source files.

package

Specifies the Go package name to use in generated files.

include

A list of include paths used for local header lookups (as in #include "file.h").

Example:

include:
  - /custom/include/path

sys_include

A list of include paths used for system header lookups (as in #include <file.h>).

Example:

sys_include:
  - /custom/include/path

define

A list of #define directives added to all transpiled C files.

Example:

define:
  - name: CXGO
  - name: CXGO_USED
    value: 1
  - name: VERSION
    value: '"dev"'
  - name: MYFUNC(x)
    value: my_func(&x)

int_size

A size of the C int type in bytes. Defaults to a corresponding value for the current GOARCH value.

ptr_size

A size of C pointer types in bytes. Defaults to a corresponding value for the current GOARCH value.

wchar_size

A size of the wchar_t type in bytes. Defaults to 2.

use_go_int

Use Go int and uint in place of C int and unsigned int.

Defaults to explicit int sizes set by int_size (int32, uint32).

skip

Specifies a list of names of declarations to skip in all files. It allows removing specific functions/types/variables from all generated Go files.

Example:

skip:
  - some_func
  - some_type
  - some_var

See also: files.skip.

replace

Specifies a list of replacements applied to all files. See files.replace.

implicit_returns

Automatically generates implicit returns, which are valid in C.

Defaults to false. This is done to cause a compilation error in Go to let the user decide if he wants to fix C code, or add this workaround.

files

A list of files to be processed by cxgo.

files.disabled

Allows to disable this file, even though it's present in the config.

files.name

Specifies a name of C file to be processed.

If .c extension is specified, a corresponding .h file is also considered.

Can contain wildcards: *.c, **/*.c.

When files.content is specified, a file will be created in out instead. In this case it can have any extension.

files.go

Specifies a corresponding Go file name for this C file. Defaults to file.go.

Example:

files:
  - name: some_file.c
    go: custom.go

files.content

If this key is specified, the files is not read from root and instead is created with a given content in out.

Useful to automatically create Go files complementary to the generated code.

Example:

files:
  - name: methods.go
    content: |
      package lib
      
      func (c *SomeCType) GetX() int {
        // ...
      }

files.max_decl

Specifies a maximal number of declarations in a generated Go file. If there are more declarations, Go file will be split to multiple files (file_1.go, file_2.go, etc).

Useful when converting giant C files.

files.skip

Specifies a list of names of declarations to skip in a particular file. It allows removing specific functions/types/variables from a specific Go file.

Example:

files:
  - name: file.c
    skip:
      - some_func
      - some_type
      - some_var

See also: skip.

files.replace

Specifies a list of replacements applied to a particular file. Replacements are done after Go file is generated and formatted.

Example:

files:
  - name: file.c
    replace:
      - old: 'asm("x")'
        new: 'panic("asm")'
      - regexp: 'a\s*b'
        new: 'a b'
      - old: |
          const FOO int32 = 1
        new: |
          const FOO = 1

See also replace.

files.idents

A list of configurations for translating identifiers (functions/types/variables) for a particular file. See idents.

idents

A list of configurations for translating identifiers (functions/types/variables), applied to all files.

idents.name

A name of the identifier in C.

idents.index

An index of the identifier in the arguments list. Used only in idents.fields.

idents.rename

Sets a name for this identifier in Go

Example:

idents:
  - name: some_func
    rename: SomeFunc

idents.alias

Use the underlying type in place of this named type. Useful to remove unnecessary types generated from typedef.

It's not the same as Go alias types (type A = B). It will not generate the Go alias declaration and will just use underlying type in all places.

Example:

idents:
  - name: mytype_t
    alias: true

idents.type

Allows overriding Go type for this identifier.

Valid values are:

  • bool - uses Go bool instead of C int
  • string - uses Go string instead of C char*
  • slice - uses Go []T instead of C T*
  • iface - uses Go interface{}

Example:

idents:
  - name: mytype_t
    fields:
      - name: ptr
        type: slice
  - name: myfunc
    fields:
      - name: arg1
        type: slice

idents.flatten

Flattens function control flow to workaround invalid gotos.

Example:

idents:
  - name: myfunc
    flatten: true

idents.fields

Allows controlling transpilation of struct fields or function arguments.

Example:

idents:
  - name: mytype_t
    fields:
      - name: ptr
        type: slice
  - name: myfunc
    fields:
      - name: arg1
        type: slice

exec_before

A command to execute before transpiling. Executed in root.

Example:

exec_before: ['./configure']

exec_after

A command to execute after transpiling. Executed in out.

Example:

exec_after: ['go', 'generate']