With -Wformat options enabled there are test fails:
cc1: error: -Wformat-security ignored without -Wformat [-Werror=format-security]
cc1: all warnings being treated as errors
../o-iterator.mk:9: recipe for target
'/home/abuild/rpmbuild/BUILD/glibc-2.24/cc-base/time/test_time.o' failed
As some targets disables -Wformat explicitly:
(time/Makefile):
# Don't warn about Y2k problem in strftime format string.
CFLAGS-test_time.c = -Wno-format
Change-Id: Ic0f8b6bb07ea7875a75b994584ac10cec6515827
BuildFlags="$BuildFlags -O2 -g -U_FORTIFY_SOURCE"
BuildFlags="$(echo $BuildFlags | sed -e 's#-fstack-protector##' -e 's#-ffortify=[0-9]*##')"
BuildFlags="$(echo $BuildFlags | sed -e 's/-Wa,-mimplicit-it=thumb//g' | sed -e 's/-mthumb//g')"
+# Turn off all -Wformat enable flags as there are glibc tests that explicitly
+# append -Wno-format and with enabled Wformat options that produced warnings
+# that turns into errors. Remove -Wformat=1|2 or -Wformat-..-arg
+BuildFlags="$(echo $BuildFlags | sed -re 's/-Wformat((=[1-2])|((-\w+)+))?(\s|$)//g')"
+
BuildCC="%__cc"
BuildCCplus="%__cxx"
add_ons=",libidn"