"variable set but not used" error during build of VM

[DartBot]

This issue was originally filed by waqne...@gmail.com

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What steps will reproduce the problem?

1. > Follow steps to build VM mentioned at http://code.google.com/p/dart/wiki/Building#Building_the_standalone_VM

What is the expected output? What do you see instead?
I get some "variable X set but not used"-type warnings, that -Werror escalates to errors, halting the build.
As a temporary measure, I removed -Werror from all *.mk files, which allows me to build the standalone VM successfully.

What version of the product are you using? On what operating system?
Recent svn on arch linux using gcc version 4.6.1 20110819 (prerelease)

Please provide any additional information below.
Here is a full list of the warnings (without -Werror and therefor not turned to errors)

third_party/v8/src/ia32/full-codegen-ia32.cc: In member function ‘virtual void v8::internal::FullCodeGenerator::VisitCompareOperation(v8::internal::CompareOperation*)’:
third_party/v8/src/ia32/full-codegen-ia32.cc:4085:12: warning: variable ‘strict’ set but not used [-Wunused-but-set-variable]
  CXX(host) out/Debug_ia32/obj.host/v8_base/third_party/v8/src/ia32/lithium-gap-resolver-ia32.o
third_party/v8/src/ia32/lithium-codegen-ia32.cc: In member function ‘void v8::internal::LCodeGen::DoLoadKeyedFastDoubleElement(v8::internal::LLoadKeyedFastDoubleElement*)’:
third_party/v8/src/ia32/lithium-codegen-ia32.cc:2235:12: warning: variable ‘elements’ set but not used [-Wunused-but-set-variable]
third_party/v8/src/ia32/lithium-codegen-ia32.cc: In member function ‘void v8::internal::LCodeGen::DoStoreKeyedFastDoubleElement(v8::internal::LStoreKeyedFastDoubleElement*)’:
third_party/v8/src/ia32/lithium-codegen-ia32.cc:3100:12: warning: variable ‘elements’ set but not used [-Wunused-but-set-variable]
third_party/v8/src/ia32/lithium-codegen-ia32.cc:3101:12: warning: variable ‘key’ set but not used [-Wunused-but-set-variable]

third_party/v8/src/ia32/full-codegen-ia32.cc: In member function ‘virtual void v8::internal::FullCodeGenerator::VisitCompareOperation(v8::internal::CompareOperation*)’:
third_party/v8/src/ia32/full-codegen-ia32.cc:4085:12: warning: variable ‘strict’ set but not used [-Wunused-but-set-variable]
  CXX(target) out/Debug_ia32/obj.target/v8_base/third_party/v8/src/ia32/lithium-gap-resolver-ia32.o
third_party/v8/src/ia32/lithium-codegen-ia32.cc: In member function ‘void v8::internal::LCodeGen::DoLoadKeyedFastDoubleElement(v8::internal::LLoadKeyedFastDoubleElement*)’:
third_party/v8/src/ia32/lithium-codegen-ia32.cc:2235:12: warning: variable ‘elements’ set but not used [-Wunused-but-set-variable]
third_party/v8/src/ia32/lithium-codegen-ia32.cc: In member function ‘void v8::internal::LCodeGen::DoStoreKeyedFastDoubleElement(v8::internal::LStoreKeyedFastDoubleElement*)’:
third_party/v8/src/ia32/lithium-codegen-ia32.cc:3100:12: warning: variable ‘elements’ set but not used [-Wunused-but-set-variable]
third_party/v8/src/ia32/lithium-codegen-ia32.cc:3101:12: warning: variable ‘key’ set but not used [-Wunused-but-set-variable]

[DartBot]

This comment was originally written by zundel@google.com

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Added Duplicate label.
Marked as being merged into #8.

[DartBot]

This comment was originally written by zundel@google.com

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Marked as being merged into #3.

[iposva-google]

corrected duplicate id

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Marked as being merged into #43.