[Webkit-unassigned] [Bug 132220] New: [GTK] GObject introspection links to installed libs when using jhbuild

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=132220

           Summary: [GTK] GObject introspection links to installed libs
                    when using jhbuild
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: Gtk, Regression
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: cgarcia at igalia.com


See:

/home/cgarcia/src/git/gnome/WebKit/WebKitBuild/Release/Source/WebKit2/tmp-introspecttMzAlB/WebKit2WebExtension-3.0.o:(.data+0x4b8): referencia a `webkit_dom_vtt_cue_get_type' sin definir (this is undefined reference in English)
collect2: error: ld returned 1 exit status
linking of temporary binary failed: Command '['/home/cgarcia/src/git/icecream/bin/cc', '-o', '/home/cgarcia/src/git/gnome/WebKit/WebKitBuild/Release/Source/WebKit2/tmp-introspecttMzAlB/WebKit2WebExtension-3.0', '-Wno-deprecated-declarations', '-L/home/cgarcia/gnome/lib64', '/home/cgarcia/src/git/gnome/WebKit/WebKitBuild/Release/Source/WebKit2/tmp-introspecttMzAlB/WebKit2WebExtension-3.0.o', '-L.', '-Wl,-rpath=.', '-Wl,--no-as-needed', '-lwebkit2gtk-3.0', '-ljavascriptcoregtk-3.0', '-L/home/cgarcia/src/git/gnome/WebKit/WebKitBuild/Release/lib', '-Wl,-rpath=/home/cgarcia/src/git/gnome/WebKit/WebKitBuild/Release/lib', '-Wl,--export-dynamic', '-pthread', '-L/home/cgarcia/gnome/lib64', '-lgmodule-2.0', '-lgtk-3', '-lgdk-3', '-latk-1.0', '-lpangocairo-1.0', '-lgdk_pixbuf-2.0', '-lcairo-gobject', '-lpango-1.0', '-lcairo', '-lsoup-2.4', '-lgio-2.0', '-lgobject-2.0', '-lglib-2.0']' returned non-zero exit status 1

As you can see there's two -L/home/cgarcia/gnome/lib64, and the first one is very early an takes precedence. That first one comes from the LDFLAGS env varaibles that jhbuild sets. The other one, which is correctly set after the builddir paths, is deduced by g-ir-scanner from the lib arguments passed using ldd. This didn't happen with autotools because g-ir-scanner used libtool. 
This is not a problem when using the internal jhbuild because we never run make install for webkit, only for the dependencies, so the linker never finds a installed webkit in jhbuild env.
Since we are already overriding the CFLAGS env var we can simply override LDFLAGS as well to unset it, since g-ir-scanner will do the right thing deducing all library paths using ldd.

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