[Webkit-unassigned] [Bug 159880] New: [GTK] [STABLE] JSC JIT Broken on ARMv7 Traditional (without Thumb2)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159880

            Bug ID: 159880
           Summary: [GTK] [STABLE] JSC JIT Broken on ARMv7 Traditional
                    (without Thumb2)
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
                CC: berto at igalia.com, bugs-noreply at webkitgtk.org,
                    ossy at webkit.org, tpopela at redhat.com,
                    zan at falconsigh.net

When building WebKitGTK+ for ARMv7 (armhf) with traditional ARM intruction set (-marm) instead of building with Thumb2 instruction set (-mthumb) the JSC JIT fails at run-time. It builds fine, but then any webpage with JavaScript will make the WebProcess crash.

I have been able to reproduce this with 2.12.3. Not sure if its reproducible with current trunk, I will try to reproduce it there also.

It seems that GNU/Linux armhf distributions build with Thumb2 (-mthumb) by default. At least on Debian the default toolchain (gcc compiler) is built with --with-mode=thumb on armhhf. Therefore the GTK+ ARM buildbot (that runs on Debian) is only testing the ARMv7 Thumb2 build.

Related: https://bugzilla.yoctoproject.org/show_bug.cgi?id=9474

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