[Webkit-unassigned] [Bug 248986] New: [JSC] Avoid maintaining a list of hidden stdlib symbols

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248986

            Bug ID: 248986
           Summary: [JSC] Avoid maintaining a list of hidden stdlib
                    symbols
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: emw at apple.com

We manually maintain a list of symbols to hide from JavaScriptCore in OTHER_LDFLAGS_HIDE_SYMBOLS, which (as I understand it) prevents us from inadvertently exporting weak symbols for C++ standard library operator instantiations. This is a bit of annoying maintenance, as the symbols we need to hide may change arbitrarily with toolchain updates (recently: https://github.com/WebKit/WebKit/pull/6060, https://github.com/WebKit/WebKit/pull/7352). Can we do anything to avoid the maintenance?

One idea is to have a build step that analyzes object files as they are compiled and produces a list of weak stdlib symbols, which can then be passed to the linker via -unexported_symbols_list.

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