Date: Sun, 21 Sep 2025 21:37:04 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 289746] no support for c++ standard library module Message-ID: <bug-289746-227@https.bugs.freebsd.org/bugzilla/>
index | next in thread | raw e-mail
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289746 Bug ID: 289746 Summary: no support for c++ standard library module Product: Base System Version: 14.3-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: ingo@hannover.ccc.de C++23 specifies a new feature to import the std:: namespace as module ( https://wg21.link/P2465R3 ). This still needs some support from the build system, but should be supported since clang 17; see https://0xstubs.org/using-the-c23-std-module-with-clang-18/ And I can confirm it works with clang 19.1.7 on Devuan Linux. However the FreeBSD base system is missing the std.cppm file needed to build the std module. There is a std.cppm.in in /usr/src/contrib/llvm-project/libcxx/modules/ but it never gets installes into the base system. There is a std.cppm in wasi-libcxx19 but that is for generatin web assembly binaries and the processed file is not provided by the base sources. As expected that std.cppm is incompatible with the base includes: $ clang++ -std=c++23 -stdlib=libc++ -Wno-reserved-identifier -Wno-reserved-module-identifier --precompile -o std.pcm /usr/local/share/wasi-sysroot/share/libc++/v1/std.cppm In file included from /usr/local/share/wasi-sysroot/share/libc++/v1/std.cppm:230: /usr/local/share/wasi-sysroot/share/libc++/v1/std/cfenv.inc:16:14: error: using declaration referring to 'feclearexcept' with internal linkage cannot be exported 16 | using std::feclearexcept _LIBCPP_USING_IF_EXISTS; | ^ /usr/include/fenv.h:265:1: note: target of using declaration 265 | feclearexcept(int __excepts) | ^ In file included from /usr/local/share/wasi-sysroot/share/libc++/v1/std.cppm:230: /usr/local/share/wasi-sysroot/share/libc++/v1/std/cfenv.inc:17:14: error: using declaration referring to 'fegetexceptflag' with internal linkage cannot be exported 17 | using std::fegetexceptflag _LIBCPP_USING_IF_EXISTS; | ^ /usr/include/fenv.h:283:1: note: target of using declaration 283 | fegetexceptflag(fexcept_t *__flagp, int __excepts) | ^ In file included from /usr/local/share/wasi-sysroot/share/libc++/v1/std.cppm:230: /usr/local/share/wasi-sysroot/share/libc++/v1/std/cfenv.inc:20:14: error: using declaration referring to 'fetestexcept' with internal linkage cannot be exported 20 | using std::fetestexcept _LIBCPP_USING_IF_EXISTS; | ^ /usr/include/fenv.h:295:1: note: target of using declaration 295 | fetestexcept(int __excepts) | ^ In file included from /usr/local/share/wasi-sysroot/share/libc++/v1/std.cppm:230: /usr/local/share/wasi-sysroot/share/libc++/v1/std/cfenv.inc:22:14: error: using declaration referring to 'fegetround' with internal linkage cannot be exported 22 | using std::fegetround _LIBCPP_USING_IF_EXISTS; | ^ /usr/include/fenv.h:111:1: note: target of using declaration 111 | fegetround(void) | ^ In file included from /usr/local/share/wasi-sysroot/share/libc++/v1/std.cppm:230: /usr/local/share/wasi-sysroot/share/libc++/v1/std/cfenv.inc:23:14: error: using declaration referring to 'fesetround' with internal linkage cannot be exported 23 | using std::fesetround _LIBCPP_USING_IF_EXISTS; | ^ /usr/include/fenv.h:306:1: note: target of using declaration 306 | fesetround(int __round) | ^ In file included from /usr/local/share/wasi-sysroot/share/libc++/v1/std.cppm:230: /usr/local/share/wasi-sysroot/share/libc++/v1/std/cfenv.inc:27:14: error: using declaration referring to 'fesetenv' with internal linkage cannot be exported 27 | using std::fesetenv _LIBCPP_USING_IF_EXISTS; | ^ /usr/include/fenv.h:328:1: note: target of using declaration 328 | fesetenv(const fenv_t *__envp) | ^ 6 errors generated. -- You are receiving this mail because: You are the assignee for the bug.home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-289746-227>