[Webkit-unassigned] [Bug 155047] New: [CMake] Build with Werror in DEVELOPER_MODE (except on the bots)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155047

            Bug ID: 155047
           Summary: [CMake] Build with Werror in DEVELOPER_MODE (except on
                    the bots)
    Classification: Unclassified
           Product: WebKit
           Version: Other
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mcatanzaro at igalia.com

We should default ENABLE_WERROR to the value of DEVELOPER_MODE is set, to force developers to fix warnings rather than just ignoring them. This should be changed by editing WEBKIT_SET_EXTRA_COMPILER_FLAGS. Currently its default value is that of IGNORECXX_WARNINGS, which doesn't make much sense to me.

Before making this change, we need to:

 * Fix current warnings affecting the compilers we care about (at the very least: Clang 3.7, GCC 5.x, and GCC 6.x).
 * Change the bots to pass -DENABLE_WERROR=OFF, because we *really* don't want bots to break unnecessarily.

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