https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98819
--- Comment #7 from Jonny Grant <jg at jguk dot org> --- https://godbolt.org/z/bhnbsb Another example where %ld suggests to replace with %ld #include <cstdio> int main() { size_t i = 0; std::printf("%ld", i); } -Wall -Wformat-signedness x86-64 gcc (trunk) - 600ms (19538B) #1 with x86-64 gcc (trunk) <source>: In function 'int main()': <source>:6:20: warning: format '%ld' expects argument of type 'long int', but argument 2 has type 'size_t' {aka 'long unsigned int'} [-Wformat=] 6 | std::printf("%ld", i); | ~~^ ~ | | | | | size_t {aka long unsigned int} | long int | %ld Compiler returned: 0
