On 09/13/2012 05:22 PM, Kip Warner wrote: > Hey list, > > Why do many autoconfiscated projects bracket inclusion of the generated > config.h with #if HAVE_CONFIG_H / #endif.
Bad copy-and-paste habits. Probably because historically, libtool prided itself on being usable even without autoconf, and therefore libtool headers have to use HAVE_CONFIG_H. Projects that use libtool would then copy libtool's habits, even when they use autoconf, and the practice has spread to projects that don't even use libtool. > Assuming the build > environment was configured, why shouldn't the source just always > unconditionally include config.h? I mean if it isn't there, typically > that means the user didn't configure first which ought to be an error > anyways, no? Yep, you are exactly right, which is why gnulib doesn't use HAVE_CONFIG_H, and even provides a syntax check rule that you can copy into your project to also avoid it yourself. -- Eric Blake [email protected] +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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