[webkit-dev] WebCorePrefix.h vs. config.h

[Fujii Hironori]

On Sun, Dec 9, 2018 at 8:22 AM Darin Adler <darin at apple.com> wrote:

> Best would be to eliminate “config.h”: Change “config.h” into an empty
> file first, then remove all “config.h” includes, and then remove the file.
> But to do that, we need to make sure every build system for WebKit supports
> prefix headers. I don’t know how close to that we are. Maybe close? How can
> we quickly find out?


 GCC and Clang support '-include <file>' option.

  https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html
<https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html>
  https://clang.llvm.org/docs/ClangCommandLineReference.html
<https://clang.llvm.org/docs/ClangCommandLineReference.html>

GTK and WPE ports are using it only in WK2 since r163032.

  https://trac.webkit.org/changeset/163032
<https://trac.webkit.org/changeset/163032>

MSVC has /FI option.

  /FI (Name Forced Include File) | Microsoft Docs

https://docs.microsoft.com/en-us/cpp/build/reference/fi-name-forced-include-file?view=vs-2017
<https://docs.microsoft.com/en-us/cpp/build/reference/fi-name-forced-include-file?view=vs-2017>

Unfortunately, it seems that MSVC's precompiled header needs to be included
explicitly.

  /Yu (Use Precompiled Header File) | Microsoft Docs

https://docs.microsoft.com/en-us/cpp/build/reference/yu-use-precompiled-header-file?view=vs-2017
<https://docs.microsoft.com/en-us/cpp/build/reference/yu-use-precompiled-header-file?view=vs-2017>
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