On 02/15/2017 04:52 AM, Bruno Haible wrote: > Hi all, > > Some uses of AC_EGREP_CPP and AC_EGREP_HEADER probably assume that when > no continuation lines (backslash-newline) and no multiline macro invocations > are involved, each source line produces at most one output line. > > This is no longer the case with GCC >= 5.
> As you can see, here 1 source line produces up to 4 output lines (ignoring the > line number comment lines). Attempts to use 'grep Version' to find the values > of > __GLIBC__ and __GLIBC_VERSION__ don't work any more. > > Maybe the documentation of AC_EGREP_CPP and AC_EGREP_HEADER could include > a caveat about this? Indeed. grep'ping has always been fragile, but adding another warning can't hurt. I'll see if I can come up with a patch -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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