Hi! The ./configure script of skalibs tries to detect if posix_spawnp() is available on the system by generating a runtime test and executing it.
For whichever reason, uclibc-ng provides this function in librt.a, not in libc.a. So the runtime test fails when trying to link the test program. Adding -lrt to the command line to build the test program should fix this, but how to properly do it? a) Using `LDFLAGS="-lrt" ./configure ...` is not correct. Should a $LIBS variable be added and used in the `choose()` function of the script? b) Should linking with librt be forced in the test, even if it is unnecessary for other C runtimes? Example: choose cl posixspawn POSIXSPAWN 'posix_spawn()' -lrt Besides, how should the sysdeps be updated to add the dependency to librt, in order to avoid passing EXTRA_LIBS="-lrt" to `make` when building s6 and friends? Note that the current implementation of posix_spawnp() in uclibc is buggy. It causes child_spawn0() to loop infinitely as described here [1]. A fix has been sent upstream [2]. [1] https://www.mail-archive.com/supervision%40list.skarnet.org/msg01058.html [2] http://mailman.uclibc-ng.org/pipermail/devel/2016-August/001126.html Best regards, -- ELB