Fails to build

[gnzlbg]

My toolchain is gcc --version: gcc (GCC) 10.2.0 , and meson --version: 0.56.2

[240/242] Compiling C object libwlroots.so.7.p/types_wlr_surface.c.o
FAILED: libwlroots.so.7.p/types_wlr_surface.c.o
cc -Ilibwlroots.so.7.p -I. -I.. -Iinclude -I../include -Iprotocol -I../protocol -I/usr/include/libdrm -I/usr/include/pixman-1 -I/usr/include/uuid -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -Werror -std=c11 -g -DWLR_USE_UNSTABLE -Wundef -Wlogical-op -Wmissing-include-dirs -Wold-style-definition -Wpointer-arith -Winit-self -Wstrict-prototypes -Wimplicit-fallthrough=2 -Wendif-labels -Wstrict-aliasing=2 -Woverflow -Wmissing-prototypes -Wno-missing-braces -Wno-missing-field-initializers -Wno-unused-parameter -fmacro-prefix-map=../= -DHAS_LIBUUID=1 '-DICONDIR="/usr/share/icons"' -march=native -O3 -fno-plt -g0 -g -fvar-tracking-assignments -fdebug-prefix-map=$HOME/.cache/rua/build/wlroots-git/src=/usr/src/debug -D_FORTIFY_SOURCE=2 -fPIC -MD -MQ libwlroots.so.7.p/types_wlr_surface.c.o -MF libwlroots.so.7.p/types_wlr_surface.c.o.d -o libwlroots.so.7.p/types_wlr_surface.c.o -c ../types/wlr_surface.c

./types/wlr_surface.c: In function ‘surface_commit_pending’:
../types/wlr_surface.c:235:55: error: ‘src_width’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  235 |    float scale_x = (float)pending->viewport.dst_width / src_width;
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
../types/wlr_surface.c:233:8: note: ‘src_width’ was declared here
  233 |    int src_width, src_height;
      |        ^~~~~~~~~
../types/wlr_surface.c:236:56: error: ‘src_height’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
  236 |    float scale_y = (float)pending->viewport.dst_height / src_height;
      |                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
../types/wlr_surface.c:233:19: note: ‘src_height’ was declared here
  233 |    int src_width, src_height;
      |                   ^~~~~~~~~~
../types/wlr_surface.c: In function ‘wlr_surface_get_effective_damage’:
../types/wlr_surface.c:1293:62: error: ‘src_width’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
 1293 |   float scale_x = (float)surface->current.viewport.dst_width / src_width;
      |                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
../types/wlr_surface.c:1294:63: error: ‘src_height’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
 1294 |   float scale_y = (float)surface->current.viewport.dst_height / src_height;
      |                   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
cc1: all warnings being treated as errors

[emersion]

See #2736

[gnzlbg]

Thanks.

What caused this error? (shouldn't CI have caught it?)