[Webkit-unassigned] [Bug 148639] New: [CMake] Build with Debug Fission on by default on Debug builds

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=148639

            Bug ID: 148639
           Summary: [CMake] Build with Debug Fission on by default on
                    Debug builds
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
        Depends on: 131177

We are having some issues on the GTK Debug buildbots. The bots are running out of RAM sometimes.

On bug 131177 support for building with Debug Fission was added.

Now I suggest to enable this by default when building the Debug build.

I have measured the memory usage of building with and without this option for the Debug build:

* Without Debug fission:
  Max memory usage by the linker = 10.2 GB


* With Debug fission:
  Max memory usage by the linker = 7.8 GB

Not it only reduces the amount of RAM required to build WebKit in 2.4GB, but it also builds faster.


Concerns about Debug Fission builds breaking ccache were sorted out with ccache 3.2.3  https://ccache.samba.org/releasenotes.html#_ccache_3_2_3

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