Recently (~2 days or so ago?), I've failed to compile wireshark, on F17/x64:
libtool: compile: gcc -DHAVE_CONFIG_H -I. -I.. -I./.. -DINET6 -DG_DISABLE_DEPRECATED -DG_DISABLE_SINGLE_INCLUDES -DGSEAL_ENABLE -DGTK_DISABLE_DEPRECATED -DGTK_DISABLE_SINGLE_INCLUDES "-D_U_=__attribute__((unused))" -D_FORTIFY_SOURCE=2 -I/usr/local/include -DPLUGIN_DIR=\"/usr/local/lib/wireshark/plugins/1.9.0\" -Werror -g -O2 -Wall -W -Wextra -Wdeclaration-after-statement -Wendif-labels -Wpointer-arith -Wno-pointer-sign -Warray-bounds -Wcast-align -Wformat-security -Wold-style-definition -Wno-error=unused-but-set-variable -fexcess-precision=fast -pthread -I/usr/include/gtk-2.0 -I/usr/lib64/gtk-2.0/include -I/usr/include/atk-1.0 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0 -I/usr/include/pango-1.0 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/pixman-1 -I/usr/include/freetype2 -I/usr/include/libpng15 -MT privileges.lo -MD -MP -MF .deps/privileges.Tpo -c privileges.c -fPIC -DPIC -o .libs/privileges.o
privileges.c: In function 'relinquish_special_privs_perm':
privileges.c:275:12: error: ignoring return value of 'setresgid', declared with attribute warn_unused_result [-Werror=unused-result]
privileges.c:282:12: error: ignoring return value of 'setresuid', declared with attribute warn_unused_result [-Werror=unused-result]
cc1: all warnings being treated as errors
If it were git, I'm sure I could easily use 'git bisect' and find the issue.
Without it, I'm really unsure - as the last change to this file took place some time ago.
TIA,
Y.