Bug 19002 – __FUNCTION__ and __PRETTY_FUNCTION__ cannot be used as C string literals

void main() { import core.stdc.stdio; printf(__FUNCTION__); } Error: function core.stdc.stdio.printf(scope const(char*) format, ...) is not callable using argument types (string) __FUNCTION__ should be equivalent to a string literal here. Using __FILE__ or __MODULE__ works fine.

This is expected as all string literals should be zero-terminated D strings. So the following works as expected: ``` void main() { import core.stdc.stdio; printf(__FUNCTION__.ptr); } ``` The interesting bit is why __FILE__ and __MODULE__ can be passed directly to printf.

No, this is not expected. I can use printf with a string literal, and it works, even if it's via an enum, or some const folding. The compiler implicitly can cast a string literal to a const(char*), otherwise using C functions with string literals would be painful. For example: printf("hello" ~ "\n"); // ok enum x = "hello"; printf(x); // ok enum y = __FUNCTION__; printf(y); // nope enum z = ctfeFunction(); printf(z); // nope I think all of these should work, they are all string literals, and should be 0 terminated.

pull : https://github.com/dlang/dmd/pull/9920

@Basile-z updated dlang/dmd pull request #9920 "fix issue 19002 - __FUNCTION__ and __PRETTY_FUNCTION__ cannot be used as C string literals" fixing this issue: - fix issue 19002 - __FUNCTION__ and __PRETTY_FUNCTION__ cannot be used as C string literals https://github.com/dlang/dmd/pull/9920

dlang/dmd pull request #9920 "fix issue 19002 - __FUNCTION__ and __PRETTY_FUNCTION__ cannot be used as C string literals" was merged into stable: - 748fee406f8be6279d687be4acafa119fcdecaa4 by Basile Burg: fix issue 19002 - __FUNCTION__ and __PRETTY_FUNCTION__ cannot be used as C string literals https://github.com/dlang/dmd/pull/9920

dlang/dmd pull request #12923 "[dmd-cxx] fix issue 19002 - __FUNCTION__ and __PRETTY_FUNCTION__ cannot be used as C string literals" was merged into dmd-cxx: - c42fda99f18c0258bebdbb9958cf86a8c602a1bf by Basile Burg: [dmd-cxx] fix issue 19002 - __FUNCTION__ and __PRETTY_FUNCTION__ cannot be used as C string literals https://github.com/dlang/dmd/pull/12923