https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109716
Bug ID: 109716 Summary: bogus stringop-overread "reading 4 bytes from a region of size 0" Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: david at ixit dot cz Target Milestone: --- Host: x86_64 Target: x86_64 Compiler: 12.2.0, 13.0.1 20230315 (experimental) [master r13-6680-ga9ae16db8cb] Sources: https://gitlab.freedesktop.org/mesa/mesa/ main branch, (commit b59935e2e77ed6ccf210103b028d671ee277a607 ) Command: CC=/usr/lib/gcc-snapshot/bin/gcc CXX=/usr/lib/gcc-snapshot/bin/g++ meson setup builddir-snapshot -D libdir=lib -D buildtype=release -D build-tests=false -D enable-glcpp-tests=false -D libunwind=enabled -D glx=dri -D gbm=enabled -D egl=enabled -D platforms=x11,wayland -D dri3=enabled -D gallium-extra-hud=true -D gallium-vdpau=disabled -D gallium-omx=disabled -D gallium-va=disabled -D gallium-xa=disabled -D gallium-nine=false -D gallium-opencl=disabled -D gallium-rusticl=false -D llvm=enabled -D gallium-drivers=r300,i915,iris,swrast -D vulkan-drivers=panfrost -D video-codecs=h264dec,h264enc,h265dec,h265enc -D spirv-to-dxil=false -D osmesa=true -D intel-clc=disabled -D imagination-srv=false ``` [1447/1646] Compiling C object src/gallium/drivers/r300/libr300.a.p/r300_state_derived.c.o ../src/gallium/drivers/r300/r300_state_derived.c: In function 'r300_get_border_color': ../src/gallium/drivers/r300/r300_state_derived.c:676:5: warning: 'util_format_unswizzle_4f' reading 4 bytes from a region of size 0 [-Wstringop-overread] 676 | util_format_unswizzle_4f(border_swizzled, border, desc->swizzle); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ../src/gallium/drivers/r300/r300_state_derived.c:676:5: note: referencing argument 3 of type 'const unsigned char[4]' In file included from ../src/compiler/nir/nir.h:43, from ../src/gallium/auxiliary/draw/draw_context.h:42, from ../src/gallium/drivers/r300/r300_state_derived.c:24: ../src/util/format/u_format.h:1684:6: note: in a call to function 'util_format_unswizzle_4f' 1684 | void util_format_unswizzle_4f(float *dst, const float *src, | ^~~~~~~~~~~~~~~~~~~~~~~~ ``` Our project bug: https://gitlab.freedesktop.org/mesa/mesa/-/issues/8651