[Webkit-unassigned] [Bug 145683] New: [CMake][GTK] Error when gtk-doc is not installed is too confusing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145683

            Bug ID: 145683
           Summary: [CMake][GTK] Error when gtk-doc is not installed is
                    too confusing
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: PC
                OS: All
            Status: NEW
          Severity: Minor
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com

If gtk-doc is not installed and gtk-doc is generated, we get a horrible build error. We should do better than this.

FAILED: cd /home/mcatanzaro/WebKit/WebKitBuild/Release && CC=/usr/lib64/ccache/cc CFLAGS= /home/mcatanzaro/WebKit/Tools/gtk/generate-gtkdoc --skip-html && touch docs-build-no-html.stamp
Copying template files to output directory...
Running gtkdoc-scan

Generating webkitdomgtk-4.0 documentation...
Traceback (most recent call last):
  File "/home/mcatanzaro/WebKit/Tools/gtk/generate-gtkdoc", line 201, in <module>
    saw_warnings = generate_documentation(webkitdom_generator)
  File "/home/mcatanzaro/WebKit/Tools/gtk/generate-gtkdoc", line 148, in generate_documentation
    return generate_doc(generator, arguments.skip_html)
  File "/home/mcatanzaro/WebKit/Tools/gtk/generate-gtkdoc", line 134, in generate_doc
    generator.generate(not skip_html)
  File "/home/mcatanzaro/WebKit/Tools/gtk/gtkdoc.py", line 142, in generate
    self._run_gtkdoc_scan()
  File "/home/mcatanzaro/WebKit/Tools/gtk/gtkdoc.py", line 309, in _run_gtkdoc_scan
    self._run_command(args)
  File "/home/mcatanzaro/WebKit/Tools/gtk/gtkdoc.py", line 192, in _run_command
    stderr=subprocess.PIPE)
  File "/usr/lib64/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/usr/lib64/python2.7/subprocess.py", line 1335, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory

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