On 01/22/2018 09:55 AM, Victor Porton wrote: > I am writing a software for Linux/Unix which could benefit from > execvpe() C function. > > But this function is defined only when -D_GNU_SOURCE. > > Question 1: Should I ALWAYS use -D_GNU_SOURCE for compiler options no > matter what are user options? If you want to enable the use of a platform's extensions, the easiest way is to use the AC_USE_SYSTEM_EXTENSIONS macro (rather than -D_GNU_SOURCE, as that only works for a subset of systems), prior to the rest of your configure.ac that probes which extensions are now available. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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