warning during compile php 7.1 ubuntu

/bin/bash /tmp/ev-1.0.4/libtool --mode=compile cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I/tmp/ev-1.0.4/libev -I. -I/tmp/ev-1.0.4 -DPHP_ATOM_INC -I/tmp/ev-1.0.4/include -I/tmp/ev-1.0.4/main -I/tmp/ev-1.0.4 -I/usr/include/php/20160303 -I/usr/include/php/20160303/main -I/usr/include/php/20160303/TSRM -I/usr/include/php/20160303/Zend -I/usr/include/php/20160303/ext -I/usr/include/php/20160303/ext/date/lib -I/tmp/ev-1.0.4/php7 -DHAVE_CONFIG_H -g -O2 -c /tmp/ev-1.0.4/php7/evwrap.c -o php7/evwrap.lo libtool: compile: cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I/tmp/ev-1.0.4/libev -I. -I/tmp/ev-1.0.4 -DPHP_ATOM_INC -I/tmp/ev-1.0.4/include -I/tmp/ev-1.0.4/main -I/tmp/ev-1.0.4 -I/usr/include/php/20160303 -I/usr/include/php/20160303/main -I/usr/include/php/20160303/TSRM -I/usr/include/php/20160303/Zend -I/usr/include/php/20160303/ext -I/usr/include/php/20160303/ext/date/lib -I/tmp/ev-1.0.4/php7 -DHAVE_CONFIG_H -g -O2 -c /tmp/ev-1.0.4/php7/evwrap.c -fPIC -DPIC -o php7/.libs/evwrap.o In file included from /tmp/ev-1.0.4/php7/evwrap.c:2:0: /tmp/ev-1.0.4/php7/../libev/ev.c:1825:31: warning: ‘ev_default_loop_ptr’ initialized and declared ‘extern’ EV_API_DECL struct ev_loop ev_default_loop_ptr = 0; / needs to be initialised to make it a definition despite extern */ ^ /tmp/ev-1.0.4/php7/../libev/ev.c: In function ‘evpipe_write’: /tmp/ev-1.0.4/php7/../libev/ev.c:2454:11: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result] write (evpipe [1], &counter, sizeof (uint64_t)); ^ /tmp/ev-1.0.4/php7/../libev/ev.c:2466:11: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result] write (evpipe [1], &(evpipe [1]), 1); ^ /tmp/ev-1.0.4/php7/../libev/ev.c: In function ‘pipecb’: /tmp/ev-1.0.4/php7/../libev/ev.c:2487:11: warning: ignoring return value of ‘read’, declared with attribute warn_unused_result [-Wunused-result] read (evpipe [1], &counter, sizeof (uint64_t)); ^ /tmp/ev-1.0.4/php7/../libev/ev.c:2501:11: warning: ignoring return value of ‘read’, declared with attribute warn_unused_result [-Wunused-result] read (evpipe [0], &dummy, sizeof (dummy)); ^ /bin/bash /tmp/ev-1.0.4/libtool --mode=compile cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I/tmp/ev-1.0.4/libev -I. -I/tmp/ev-1.0.4 -DPHP_ATOM_INC -I/tmp/ev-1.0.4/include -I/tmp/ev-1.0.4/main -I/tmp/ev-1.0.4 -I/usr/include/php/20160303 -I/usr/include/php/20160303/main -I/usr/include/php/20160303/TSRM -I/usr/include/php/20160303/Zend -I/usr/include/php/20160303/ext -I/usr/include/php/20160303/ext/date/lib -I/tmp/ev-1.0.4/php7 -DHAVE_CONFIG_H -g -O2 -c /tmp/ev-1.0.4/php7/util.c -o php7/util.lo libtool: compile: cc -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -I/tmp/ev-1.0.4/libev -I. -I/tmp/ev-1.0.4 -DPHP_ATOM_INC -I/tmp/ev-1.0.4/include -I/tmp/ev-1.0.4/main -I/tmp/ev-1.0.4 -I/usr/include/php/20160303 -I/usr/include/php/20160303/main -I/usr/include/php/20160303/TSRM -I/usr/include/php/20160303/Zend -I/usr/include/php/20160303/ext -I/usr/include/php/20160303/ext/date/lib -I/tmp/ev-1.0.4/php7 -DHAVE_CONFIG_H -g -O2 -c /tmp/ev-1.0.4/php7/util.c -fPIC -DPIC -o php7/.libs/util.o

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