On Wed, Jun 25, 2025 at 09:07:15AM -0800, Junio C Hamano wrote: > "Carlo Marcelo Arenas Belón via GitGitGadget" > <gitgitgadget@xxxxxxxxx> writes: > > > +# Define USE_NON_POSIX_SIGNAL if don't have support for SA_RESTART or > > +# prefer using ANSI C signal() over POSIX sigaction() > > + > > +AC_CACHE_CHECK([whether SA_RESTART is supported], [ac_cv_siginterrupt], [ > > + AC_COMPILE_IFELSE( > > + [AC_LANG_PROGRAM([#include <signal.h>], [[ > > + #ifdef SA_RESTART > > + #endif > > + siginterrupt(SIGCHLD, 1) > > This is curious. What is this #ifdef/#endif doing that does not > have anything in it? It checks that `SA_RESTART` is defined in `signal.h`, which should fail at least in QNX, NonStop and Windows. Carlo
