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From: | Paolo Bonzini |
Subject: | Re: Bug #593838: AX_CFLAGS_GCC_OPTION misuses AS_VAR_PUSHDEF variable |
Date: | Fri, 01 Oct 2010 17:07:29 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.9) Gecko/20100907 Fedora/3.1.3-1.fc13 Lightning/1.0b3pre Mnenhy/0.8.3 Thunderbird/3.1.3 |
On 10/01/2010 03:57 PM, Eric Blake wrote:
Either way, the name of the indirect variable being assigned is $prefix_a_b, whether you use pre- or post-2.67. Why is 'a=b' being passed instead of 'a_b' in the first place? I'd need to see more context of the real macro usage (rather than this trivial test case) to see whether the efficiency hit is a corner case of a=b is likely in real life and thus a performance regression, or just an extreme that is not worth worrying about.
Given it's about GCC options, I'd guess the real parameter was akin to -Wformat=2 and it's building something like ax_cv_gcc_option__Wformat_2.
Paolo
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