Did the rules for precompiled headers change between BC++ 4.5 and BC++ 5.0? I just upgraded to 5.01 and tried to recompile an old project. Its C++ files simply included , but to get them to recompile with BC++ 5.01, I had to add header includes for the specific classes used. For example, to use a TComboBox, I had to include (did this really need to change?) and then . Otherwise, the compiler spewed errors related to not understanding the types used.
Answer:
Check your defines in the options for compiling. You will see a OWL_PCH defined. If you want all OWL header, change this OWL_PCH to OWL_ALL_PCH. Of course, this precompiled header will get very large so you better have lots of RAM. Furthermore, unless _OWL_ALL_PCH is defined, you only get PCH support for the "core OWL" classes: TWindow, TDialog,TApplication, TModule, TDC and a few others.