I have been attempting to build webkit with the –coverage argument (as well as 
run the generate-coverage-data script), and am receiving the error below.  Does 
anyone have experience building with –coverage or running the coverage script?


…..

clang: warning: argument unused during compilation: '-MMD'

Ld 
/Users/jacobg/WebKit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore
 normal x86_64
    cd /Users/jacobg/WebKit/Source/JavaScriptCore
    setenv MACOSX_DEPLOYMENT_TARGET 10.7
    /Developer/usr/bin/clang++ -arch x86_64 -dynamiclib 
-L/Users/jacobg/WebKit/WebKitBuild/Release 
-F/Users/jacobg/WebKit/WebKitBuild/Release -filelist 
/Users/jacobg/WebKit/WebKitBuild/JavaScriptCore.build/Release/JavaScriptCore.build/Objects-normal/x86_64/JavaScriptCore.LinkFileList
 -Xlinker --no-demangle -exported_symbols_list 
/Users/jacobg/WebKit/WebKitBuild/Release/DerivedSources/JavaScriptCore/JavaScriptCore.JSVALUE64.exp
 -install_name 
/Users/jacobg/WebKit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore
 -mmacosx-version-min=10.7 -dead_strip -lobjc -Wl,-Y,3 -sub_library libobjc 
-framework CoreServices -Xlinker -objc_gc_compaction -ftest-coverage 
-fprofile-arcs -lgcov -fprofile-arcs -ftest-coverage -framework CoreFoundation 
-framework Foundation -licucore -lobjc -single_module -compatibility_version 1 
-current_version 535.16 -o 
/Users/jacobg/WebKit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore
ld: library not found for -lgcov
Command /Developer/usr/bin/clang++ failed with exit code 1


** BUILD FAILED **


The following build commands failed:
Ld 
/Users/jacobg/WebKit/WebKitBuild/Release/JavaScriptCore.framework/Versions/A/JavaScriptCore
 normal x86_64
(1 failure)
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