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References: <bug-37249-16637@http.gcc.gnu.org/bugzilla/>
Subject: [Bug c/37249] gcc does not warn on trucate of int64_t to int32_t
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------- Comment #1 from pinskia at gcc dot gnu dot org  2008-08-27 02:34 -------
try -Wconversion, which works like what you want it to work in 4.3 and above.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37249