[CMake] Change optimization level for a particular XCode configuration

[Keith Johnston]

I am trying to change the optimization setting for a particular
configuration in the genreated XCode project, specifically the
"RelWithDebInfo" configuration. The default optimization level is "2" and I
would like it to be "3".

Here is my CMakeLists.txt
set(XCODE_ATTRIBUTE_GCC_OPTIMIZATION_LEVEL[variant=RelWithDebInfo] 3)

project (Hello)
add_executable (Hello hello.c)

The generated project still has the optimization level set to "2". Is this
the correct way to override that setting?

I am using cmake version 2.8.12.1.
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