Hi Bruno, I tried further investigate this issue and I have discovered that libtextstyle/lib/config.h contains following lines:
``` #define sprintf libtextstyle_sprintf #define sscanf libtextstyle_sscanf ``` Since config.h is included before any system header file, later when system's stdio.h is included, I assume this macro is defined and instead of declaring/defining inline sprintf it ends up declaring/defining libtextstyle_sprintf. I believe this is what causes build error with clang-cl. I have not investigated what causes these lines to appear in config.h. I believe you are familiar with gnulib's internals and how things work far better than me. - Kirill Makurin ________________________________ From: Bruno Haible <br...@clisp.org> Sent: Tuesday, June 10, 2025 11:40 PM To: bug-gnulib@gnu.org <bug-gnulib@gnu.org>; Kirill Makurin <maiddais...@outlook.com> Subject: Re: clang-cl: undeclared library function 'sprintf' Kirill Makurin wrote: > In MSVC headers, sprintf and friends can be either simply declared as > externals or defined as inline functions. It seems to be controlled > some internal (not documented) macro. I believe it should always be > visible as an inline function to user code. I would try to force the MSVC headers to declare 'sprintf' as 'extern', not inline. Bruno
