Created attachment 1092642 [details]
full build log (including less serious bugs - unused variables and results)

Description of problem:
rebuild of spice-server with address sanitizer enabled yields these errors:
----
glz_encoder_dictionary.c: In function 'glz_dictionary_pre_encode':
glz_encoder_dictionary.c:512:30: warning: 'prev_seg_id' may be used uninitialized in this function [-Wmaybe-uninitialized]
             dict->window.segs[prev_seg_id].next = seg_id;
                              ^
glz_encoder_dictionary.c:488:22: note: 'prev_seg_id' was declared here
     uint32_t seg_id, prev_seg_id;
                      ^
----
red_channel.c: In function 'red_channel_client_wait_pipe_item_sent':
red_channel.c:2382:84: warning: 'end_time' may be used uninitialized in this function [-Wmaybe-uninitialized]
                                                      timeout == -1 ? -1 : end_time - red_now());
                                                                                    ^
----


Version-Release number of selected component (if applicable):
spice-server-0.12.4-15.el7.x86_64
libasan-4.8.5-4.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. grab a spice-server srpm, add these lines to %build section of .spec, rebuild:
# sanitizer, disable -debug pkg
%global optflags %(echo %{optflags} | sed 's/ -g / -ggdb -fno-omit-frame-pointer -fsanitize=address /')
%global __global_ldflags %(echo "%{__global_ldflags} -fsanitize=address -lasan")
%global __strip /bin/true
%global debug_package %{nil}
2.
3.

Actual results:
warnings from Description are emitted

Expected results:
bugs (if any) should be fixed, harmless warnings may deserver some explanation or suppression.

Additional info: