Always generate warning/error for assignment as truth value

7 msg	Updating an operand in RTL for a builtin function
4 msg	Expression with 2 operations
6 msg	GCC 4.1: Problem with old-loop and REG_EQUAL notes
12 msg	bugzilla broken?

Always generate warning/error for assignment as...
\ Ching, Jimen \(US SSA\) (2 May 2007)

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Subject:	Always generate warning/error for assignment as truth value
Group:	Gcc
From:	Ching, Jimen \(US SSA\)
Date:	2 May 2007

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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