[Webkit-unassigned] [Bug 265813] New: [WPE][GTK] Remove pkg-config use from FindLibBacktrace.cmake and disable ENABLE_LIBBACKTRACE by default

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=265813

            Bug ID: 265813
           Summary: [WPE][GTK] Remove pkg-config use from
                    FindLibBacktrace.cmake and disable ENABLE_LIBBACKTRACE
                    by default
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at redhat.com
                CC: bugs-noreply at webkitgtk.org, vitaly at igalia.com

Currently FindLibBacktrace.cmake uses pkg-config expecting to find a backtrace.pc, but I don't think libbacktrace from https://github.com/ianlancetaylor/libbacktrace actually installs any such pkg-config file. At least, I've failed to find any pkg-config file in the source repo, and I also couldn't find any code that generates it. So, let's remove this and rely on CMake heuristics to hopefully find the library.

Also, I notice that libbacktrace has no upstream releases on GitHub, so I think it's too soon for it to be packaged in distros or enabled by default. It's actually not clear if any releases of this library are ever planned. It seems that upstream considers every commit to be "version 1.0" rather than picking a commit to be a release, which is not confidence-inspiring. This could probably be easily fixed, but in the meantime, let's leave this option off by default for now. Hopefully eventually it will become more clear whether libbacktrace is serious about being packaged by distros or not.

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