Doc: Document the ltcg CONFIG value
Fixes: QTBUG-81035 Change-Id: I41bff3aef3ac0ce7c117ab2245491dceb6f2685b Reviewed-by: Kai Koehne <kai.koehne@qt.io>
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Specifies project configuration and compiler options. The values are
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recognized internally by qmake and have special meaning.
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The following \c CONFIG values control compilation flags:
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The following \c CONFIG values control compiler and linker flags:
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\table
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\header \li Option \li Description
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\row \li warn_off \li The compiler should output as few warnings as possible.
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\row \li exceptions \li Exception support is enabled. Set by default.
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\row \li exceptions_off \li Exception support is disabled.
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\row \li ltcg \li Link time code generation is enabled.
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This option is off by default.
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\row \li rtti \li RTTI support is enabled. By default, the compiler
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default is used.
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\row \li rtti_off \li RTTI support is disabled. By default, the compiler
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