enable_language

Enable languages (CXX/C/OBJC/OBJCXX/Fortran/etc)

enable_language(<lang>... [OPTIONAL])

Enables support for the named languages in CMake. This is the same as the project() command but does not create any of the extra variables that are created by the project() command.

The supported languages are:

C

CXX

C++

CSharp

在 3.8 版被加入.

C#

CUDA

在 3.8 版被加入.

OBJC

在 3.16 版被加入.

Objective-C

OBJCXX

在 3.16 版被加入.

Objective-C++

Fortran

HIP

在 3.21 版被加入.

ISPC

在 3.18 版被加入.

Swift

在 3.15 版被加入.

ASM

Assembly language supported by the C compiler.

If enabling ASM, list it last so that CMake can check whether the C or CXX compiler supports assembly.

ASM_NASM

Netwide Assembler

ASM_MARMASM

在 3.26 版被加入.

Microsoft Assembler (ARM, ARM64)

ASM_MASM

Microsoft Assembler (x86, x64)

ASM_POASM

在 4.4 版被加入.

Pelles C toolchain assembler.

ASM-ATT

以下限制適用於呼叫 enable_language() 的位置：

• It must be called in file scope, not in a function() call nor inside a block().

• It must not be called before the first call to project(). See policy CMP0165.

• It must be called in the highest directory common to all targets using the named language directly for compiling sources or indirectly through link dependencies. It is simplest to enable all needed languages in the top-level directory of a project.

The OPTIONAL keyword is a placeholder for future implementation and does not currently work. Instead you can use the CheckLanguage module to verify support before enabling.