From 5f4785c2acb7e261b05dfc5794149d87a75dfeb8 Mon Sep 17 00:00:00 2001 From: Rahul Bedarkar Date: Tue, 20 Dec 2016 18:29:11 +0530 Subject: [PATCH] Add check to detect clock_nanosleep() in librt With glibc versions before 2.17, we get following build error: canfdtest.o: In function `millisleep': canfdtest.c:(.text+0x212): undefined reference to `clock_nanosleep' collect2: error: ld returned 1 exit status make[1]: *** [canfdtest] Error 1 make[1]: *** Waiting for unfinished jobs.... glibc versions before 2.17 needs to link with -lrt for clock_nanosleep(). This patch adds support to detect if linking with librt is required. This build issue is detected by Buildroot autobuilder: http://autobuild.buildroot.net/results/0e5/0e5242376ff6aa82e89ed1172350e05009d48156/build-end.log Signed-off-by: Rahul Bedarkar --- configure.ac | 2 ++ 1 file changed, 2 insertions(+) diff --git a/configure.ac b/configure.ac index 8b50fb7..df9a193 100644 --- a/configure.ac +++ b/configure.ac @@ -73,6 +73,8 @@ AC_CHECK_FUNCS([ \ strtoul \ ]) +# glibc versions before 2.17 needs to link with -lrt for clock_nanosleep +AC_SEARCH_LIBS([clock_nanosleep], [rt]) AC_CHECK_DECL(SO_RXQ_OVFL,, [AC_DEFINE([SO_RXQ_OVFL], [40], [SO_RXQ_OVFL])]