| Ticket UUID: | ae62bacc43e4c89cc8602faee8a664e14dacd8fd | ||
| Title: | -Wformat warnings with MSYS2 UCRT64: TCL_LL_MODIFIER "I64" is checked as gnu_printf | ||
| Type: | Bug | Created on: | 2026-10-29 10:07:11 |
| Submitter: | serhiy.storchaka | Assigned to: | jan.nijtmans |
| Subsystem: | 53. Configuration and Build Tools | Severity: | Minor |
| Priority: | 5 Medium | Last modified: | 2026-10-29 16:47:51 |
| Status: | Closed | Closed by: | jan.nijtmans |
| Resolution: | Fixed | Closed on: | 2026-10-29 10:54:07 |
| Version: | 8.6.18, 9.0.5, 9.1.1 | ||
| Description: | ||||
|
Building with MSYS2 UCRT64 (gcc 16.2.0) gives many -Wformat warnings, all on format strings using TCL_LL_MODIFIER, TCL_Z_MODIFIER or TCL_T_MODIFIER: generic/tkBind.c:2985:50: warning: format '%u' expects argument of type 'unsigned int', but argument 4 has type 'long long unsigned int' [-Wformat=] generic/tclStrToD.c:5315:44: warning: 'I' flag used with '%x' gnu_printf format [-Wformat=] With -D__USE_MINGW_ANSI_STDIO=0, which configure sets, tcl.h defines TCL_LL_MODIFIER as "I64", but the UCRT64 headers check the formats as gnu_printf, which does not know I64. The counts: Tcl 11 (8.6), 31 (9.0), 29 (9.1); Tk 52 (8.6), 57 (9.0), 67 (9.1). This was reported in [c975939973], closed as Remind because 8.6 has to support the Windows XP runtime. A UCRT build uses the UCRT printf, which accepts ll, so perhaps "ll" could be used when _UCRT is defined. | ||||
| User Comments: | ||||
jan.nijtmans added on 2026-10-29 10:54:07:
Good idea! Thanks! Merged to [14e76b55b7c270a6]. Will also be merged to core-9-0-branch and core-8-6-branch serhiy.storchaka added on 2026-10-29 16:47:51:
Tk still gets these warnings: generic/tkInt.h undefines TCL_LL_MODIFIER and defines it again with the old condition, so it needs the same !defined(_UCRT). With that, Tk 9.1 builds without warnings with MSYS2 UCRT64. | ||||