On 07/03/2014 11:38 PM, Minxuan Zhuang wrote: > 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: No. You _don't_ want to test the compiler version. Instead, you want to test the compiler feature (as features can be backported across versions). > > if gcc version == 4.1.2 > CFLAGS＝．．．． > else > CFLAGS =..... > > how can I implement it in configure.ac? Look at how gnulib does it: http://git.savannah.gnu.org/cgit/gnulib.git/tree/m4/manywarnings.m4 -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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