[Webkit-unassigned] [Bug 141989] New: CMake build of libllvmForJSC.so should limit its export list like the Xcode build does

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=141989

            Bug ID: 141989
           Summary: CMake build of libllvmForJSC.so should limit its
                    export list like the Xcode build does
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: fpizlo at apple.com

Our Xcode build of libllvmForJSC.dylib only exports one symbol.  This protects our LLVM instance from having any interaction with other LLVMs that might be linked by the client.

We do it in Configurations/LLVMForJSC.xcconfig:

OTHER_LDFLAGS_HIDE_SYMBOLS = -Wl,-exported_symbol -Wl,_initializeAndGetJSCLLVMAPI -Wl,-all_load;

Looking at libllvmForJSC.so, it's clear that it's exporting the world.  I just did an nm on it and there are many symbols with uppercase letter codes, indicating that they are global.

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