From: Philippe Mathieu-Daudé <phi...@redhat.com> When building with GCC9 using CFLAG -Wimplicit-fallthrough=2 we get:
hw/display/tcx.c: In function ‘tcx_dac_writel’: hw/display/tcx.c:453:26: error: this statement may fall through [-Werror=implicit-fallthrough=] 453 | s->dac_index = (s->dac_index + 1) & 0xff; /* Index autoincrement */ | ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ hw/display/tcx.c:454:9: note: here 454 | default: | ^~~~~~~ hw/display/tcx.c: In function ‘tcx_dac_readl’: hw/display/tcx.c:412:22: error: this statement may fall through [-Werror=implicit-fallthrough=] 412 | s->dac_index = (s->dac_index + 1) & 0xff; /* Index autoincrement */ | ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ hw/display/tcx.c:413:5: note: here 413 | default: | ^~~~~~~ cc1: all warnings being treated as errors Give a hint to GCC by adding the missing fall through comments. Fixes: 55d7bfe22 Reviewed-by: Richard Henderson <richard.hender...@linaro.org> Signed-off-by: Philippe Mathieu-Daudé <phi...@redhat.com> Reviewed-by: Aleksandar Markovic <amarko...@wavecomp.com> Reviewed-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk> Message-Id: <20191218192526.13845-3-phi...@redhat.com> Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> --- hw/display/tcx.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/hw/display/tcx.c b/hw/display/tcx.c index 14e829d..abbeb30 100644 --- a/hw/display/tcx.c +++ b/hw/display/tcx.c @@ -410,6 +410,7 @@ static uint64_t tcx_dac_readl(void *opaque, hwaddr addr, case 2: val = s->b[s->dac_index] << 24; s->dac_index = (s->dac_index + 1) & 0xff; /* Index autoincrement */ + /* fall through */ default: s->dac_state = 0; break; @@ -451,6 +452,7 @@ static void tcx_dac_writel(void *opaque, hwaddr addr, uint64_t val, s->b[index] = val >> 24; update_palette_entries(s, index, index + 1); s->dac_index = (s->dac_index + 1) & 0xff; /* Index autoincrement */ + /* fall through */ default: s->dac_state = 0; break; -- 1.8.3.1