What Can be Precompiled

A file to be precompiled does not have to be a header file ( .h or .hpp files, for example), but it must meet these requirements:

• The file must be a source code file in text format.

  You cannot precompile libraries or other binary files.

• A C source code file that will be automatically precompiled must have .pch file name extension.
• Precompiled files must have a .mch file name extension.
• The file to be precompiled does not have to be in a CodeWarrior IDE project, although a project must be open to precompile the file.

  The CodeWarrior IDE uses the build target settings to precompile a file.

• The file must not contain any statements that generate data or executable code.

  However, the file may define static data.

• Precompiled header files for different build targets are not interchangeable.
• A source file may include only one precompiled file.
• A file may not define any items before including a precompiled file.

  Typically, a source code file includes a precompiled header file before anything else (except comments).