[Webkit-unassigned] [Bug 32992] New: [Qt] fix DRT link failures on --no-svg builds when only making changes to DRT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=32992

           Summary: [Qt] fix DRT link failures on --no-svg builds when
                    only making changes to DRT
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Other
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: robert at roberthogan.net


If you're working from a --minimal or --no-svg build and make changes to the
DRT, then recompile, the build will fail.

This is because the current behavior at build time is to assume that the
previous Qt build supported SVG and consequently delete libQtWebKit.so.
Unfortunately, just deleting libQtWebKit.so will not cause the library to
re-link. Instead the build will see libQtWebKit.so.4 and co., pass over the
linking phase, and attempt to link the DRT with libQtWebKit.so absent. This
results in a link failure on the DRT.

Since re-linking libQtWebKit can take up to ten minutes and should be avoided
in cases where not actually required, I suggest removing the assumption that
the previous Qt build supported SVG, and amend the symbol detection to look for
a symbol name that is not present in SVG builds. Currently webkitdirs.pm looks
for 'SVGElement' but even non-SVG builds contain the symbol 'isSVGElement'.

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