Always generate warning/error for assignment as truth value

[Ching, Jimen (US SSA)]

Hi,

I was wondering if there's an option to gcc/g++ to make it generate a
warning/error when an assignment is used as a truth value in an
expression.
The -Wall option does this.  But it can be silenced with parentheses.
The problem is, macros often use parentheses around expressions.  Thus,
this warning is silenced for macros.

Perhaps, in a macro, double parentheses are needed could solve this
problem.

--jc
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