https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89161
Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to fail|9.0 |10.0, 9.2.0 Last reconfirmed|2019-02-02 00:00:00 |2020-5-1 --- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> --- Reconfirming with GCC 10 with slightly different output: pr89161.c:7: sprintf: objsize = 3, fmtstr = ".%1u" Directive 1 at offset 0: ".", length = 1 Result: 1, 1, 1, 1 (1, 1, 1, 1) Directive 2 at offset 1: "%1u" pr89161.c: In function ‘main’: pr89161.c:7:24: warning: ‘%1u’ directive writing between 1 and 6 bytes into a region of size 2 [-Wformat-overflow=] 7 | sprintf(buf, ".%1u", (10 * a[0]) / a[1]); | ^~~ pr89161.c:7:22: note: directive argument in the range [0, 327675] 7 | sprintf(buf, ".%1u", (10 * a[0]) / a[1]); | ^~~~~~ Result: 1, 6, 6, 6 (2, 7, 7, 7) Directive 3 at offset 4: "", length = 1 pr89161.c:7:9: note: ‘sprintf’ output between 3 and 8 bytes into a destination of size 3 7 | sprintf(buf, ".%1u", (10 * a[0]) / a[1]); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~