On 09/02/2013 08:03 AM, Ross Lagerwall wrote: > Hi, > > I have a question about checking headers. > > Suppose I have a simple program which includes unistd.h and nothing > else. I could AC_CHECK_HEADERS([unistd.h]) but then it checks for the > header twice because using AC_CHECK_HEADERS implies checking a whole > bunch of headers: > > Is there a way of checking for the AC_INCLUDES_DEFAULT headers without > checking for anything else? Not particularly, but there IS a way to avoid AC_INCLUDES_DEFAULT in the first place: AC_CHECK_HEADERS([unistd.h], , , [ ]) to force a non-empty fourth argument to bypass the default use of AC_INCLUDES_DEFAULT. > Secondly, AC_TYPE_UINT32_T gives different results depending on whether > any headers have been checked before (eg. if I first check for dlfcn.h, > stdint.h is automatically checked for, but otherwise it is not). > This seems nonintuitive; is it supposed to be like this? Probably means that AC_TYPE_UINT32_T is missing a prereq on the standard headers; would you mind posting a reproducible test case, and we can work on fixing the bug? > > Lastly, AC_HEADER_STDC is declared obsolete yet it is required by > _AC_INCLUDES_DEFAULT_REQUIREMENTS. Why is this? Commit f52459d has already tried to address that, and is just awaiting the release of autoconf 2.70. Is there anything further we need to fix? git.sv.gnu.org/gitweb/?p=autoconf.git;a=commitdiff;h=f52459d -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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