[CMake] Can we build flatbuffers with only one language support?

[blozano-tt]

We use flatbuffers exclusively in a C++ context.

Yet, I see compile time being spent on languages I don't need:

  1311 ms: flatbuffers::csharp::CSharpGenerator::GenStruct(flatbuffers::StructD... (/work/.cpmcache/flatbuffers/2c4062bffa52fa4157b1b4deeae73395df475fda/src/idl_gen_csharp.cpp)
  1127 ms: flatbuffers::java::JavaGenerator::GenStruct(flatbuffers::StructDef&,... (/work/.cpmcache/flatbuffers/2c4062bffa52fa4157b1b4deeae73395df475fda/src/idl_gen_java.cpp)
   991 ms: flatbuffers::ts::TsGenerator::GenObjApi(flatbuffers::Parser const&, ... (/work/.cpmcache/flatbuffers/2c4062bffa52fa4157b1b4deeae73395df475fda/src/idl_gen_ts.cpp)
   950 ms: flatbuffers::ts::TsGenerator::GenStruct(flatbuffers::Parser const&, ... (/work/.cpmcache/flatbuffers/2c4062bffa52fa4157b1b4deeae73395df475fda/src/idl_gen_ts.cpp)
   814 ms: flatbuffers::java::JavaGenerator::GenPackUnPack_ObjectAPI(flatbuffer... (/work/.cpmcache/flatbuffers/2c4062bffa52fa4157b1b4deeae73395df475fda/src/idl_gen_java.cpp)
   651 ms: flatbuffers::csharp::CSharpGenerator::GenPackUnPack_ObjectAPI(flatbu... (/work/.cpmcache/flatbuffers/2c4062bffa52fa4157b1b4deeae73395df475fda/src/idl_gen_csharp.cpp)
   445 ms: flatbuffers::jsons::JsonSchemaGenerator::generate() (/work/.cpmcache/flatbuffers/2c4062bffa52fa4157b1b4deeae73395df475fda/src/idl_gen_json_schema.cpp)

Would it be possible to add CMake options to exclude certain languages, or include only subset of language support?

[aardappel]

No, I don't think this would make sense.

This is very little code, and normally building support for these languages would take less than a second on most machines. I cannot imagine how it takes over a second to compile a single function like your log appears to indicate, what kind of machine is this?