On 28/02/2019 04.00, Wei, Danmei wrote: > Hi, > > When we build qemu with "-Wmaybe-uninitialized" on, and got the following > error information. > CC qobject/json-streamer.o > CC qobject/json-parser.o > CC qobject/block-qdict.o > qobject/block-qdict.c: In function 'qdict_array_split': > qobject/block-qdict.c:259:25: error: 'subqdict' may be used uninitialized in > this function [-Werror=maybe-uninitialized] > qlist_append_obj(*dst, subqobj ?: QOBJECT(subqdict)); > ^ > cc1: all warnings being treated as errors > make: *** [qobject/block-qdict.o] Error 1 > > It is because of the uninitialized variable subqdict function > qdict_array_split. > Thanks to confirm it. > > Below is the ENV Setting: > OS: RHEL OS 7.6 > Qemu Version: commit c102d9471f8f02d9fbea72ec4505d7089173f470 > CFLAGS Setting in env: export CFLAGS="-g -O3 -Wmaybe-uninitialized"
Don't build QEMU with -O3 and -Wmaybe-uninitialized and -Werror together. -O3 produces lots of false warnings with -Wmaybe-uninitialized, so we currently don't support building QEMU with that combination. You should at least add "-Wno-error=maybe-uninitialized" if you want to build that way. Thomas
