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how to detect gcc version in

From: Minxuan Zhuang
Subject: how to detect gcc version in
Date: Fri, 4 Jul 2014 13:38:42 +0800

a project needs to satisfy both gcc 4.1.2 and gcc 4.7.3, but some options
in the latter one(like -Wno-narrowing and Wno-unused-result) cannot be used
in the former one. So I need to test the cutrrent gcc version and decide
what can of option can be assigned to CFLAGS, sth like:

if gcc version == 4.1.2
CFLAGS =.....

how can I implement it in

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