On May 29, 2009, at 11:22 PM, Graham Cox wrote:
Is there a way to tune xCode so that it warns you of these types of
potential problems (and more)? The Java development environment
I've been using for the past several years (Jetbrains IDEA) has
unbelievably fantastic code-editing and compile-time warning
systems that allow you to show a myriad of situations as warnings
(some are user definable). Is there a way to do this in xCode, or
at least set some flags to get more verbose warnings (especially
those that can prevent "dumb" mistakes)?
In your project's build settings, scroll down to "Other Warning
Flags", and paste this lot in:
-Wall -Wcast-align -Wchar-subscripts -Wextra -Wextra-tokens -
Wformat=2 -Wmissing-field-initializers -Wpointer-arith -Wshadow -
Wswitch-default -Wundef -Wwrite-strings
I'm not immediately sure what they all do, but that's what I compile
with (cleanly).
Nice list, Graham :).
It's important to note that the original question, warning about
uninitialized automatic variables, is only possible in GCC when
optimization is turned on. From Xcode's research assistant for that
particular setting (emphasis mine):
--
Warn if a variable might be clobbered by a setjmp call or if an
automatic variable is used without prior initialization.
***Detection of uninitialized automatic variable requires data flow
analsys that is only enabled during optimized compilation.***
Note that GCC cannot detect all cases where an automatic variable is
initialized or all usage patterns that may lead to use prior to
initialization.
--
In short, you can't get this warning in a Debug-style build unless you
want to sabotage your debugging efforts by adding optimization.
-- Gwynne
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