https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286342
--- Comment #7 from Jordan Gordeev <jgopensou...@proton.me> --- Created attachment 260449 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=260449&action=edit A fix for the problem I'm attaching a patch that fixes the problem. Here is my analysis of the problem: The libc++ header <locale> needs symbols like strtoll_l() or sscanf_l(). The header file <xlocale.h> provides those symbols if it is included *after* <stdio.h> and <stdlib.h>. When compiling without clang modules (which is the default), the header <locale> includes many other headers which transitively include <stdio.h> and <stdlib.h>. So, when the line in <locale> that includes <xlocale.h> is reached, the necessary prerequisite headers have already been included. When compiling with clang modules the header <xlocale.h> is included from two submodules. The inclusion in /usr/include/c++/v1/__locale_dir/locale_base_api.h is done without first including <stdio.h> and <stdlib.h> and therefore doesn't provide the necessary symbols. The inclusion in <locale> is considered a semantic import of the submodule defined by __locale_dir/locale_base_api.h. If you remove the include line for <xlocale.h> from __locale_dir/locale_base_api.h, the header <xlocale.h> will no longer be considered as belonging to the submodule defined by __locale_dir/locale_base_api.h and the include for <xlocale.h> in <locale> will properly provide the necessary symbols. -- You are receiving this mail because: You are the assignee for the bug.
