http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53946
Bug #: 53946 Summary: gcc emits warning when intmax_t is long long and format string %jd is used Classification: Unclassified Product: gcc Version: 4.5.3 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassig...@gcc.gnu.org ReportedBy: lxl...@yopmail.com /* compile with -Wall -Werror */ typedef long long intmax_t; #include <stdio.h> int main() { char x = 42; printf("%jd\n", (intmax_t) x); return 0; } $ gcc t.c -Wall -Werror cc1: warnings being treated as errors t.c: In function ‘main’: t.c:7:2: error: format ‘%jd’ expects type ‘intmax_t’, but argument 2 has type ‘long long int’