In configure.ac I've also found
CCF="-O2 -fno-strength-reduce -Wall -D_GNU_SOURCE"
From what I read on the Internet -fno-strength-reduce is needed for
versions 2.* of GCC. But the message was from 1997.
Is there nowadays need for that flag?
What is _GNU_SOURCE going to be used for? libc? It only appears in
configure.ac. Which part of the code is using it?
Looks like I should rather say AC_DEFINE(_GNU_SOURCE) as suggested for
example here: http://www.airs.com/ian/configure/configure_2.html
Ralf
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