https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96083
Bug ID: 96083 Summary: Clang can't compile <ext/throw_allocator.h>: error: use of undeclared identifier '__builtin_sprintf' Product: gcc Version: 10.1.1 Status: UNCONFIRMED Keywords: rejects-valid Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: redi at gcc dot gnu.org Target Milestone: --- $ clang++ -include bits/extc++.h -x c++ - </dev/null In file included from <built-in>:1: In file included from /usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/x86_64-redhat-linux/bits/extc++.h:69: /usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/ext/throw_allocator.h:316:7: error: use of undeclared identifier '__builtin_sprintf' __builtin_sprintf(buf, "%lu", l); ^ /usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/ext/throw_allocator.h:321:7: error: use of undeclared identifier '__builtin_sprintf' __builtin_sprintf(buf, "%lu", l); ^ /usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/ext/throw_allocator.h:325:7: error: use of undeclared identifier '__builtin_sprintf' __builtin_sprintf(buf, "%p", ref.first); ^ /usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/ext/throw_allocator.h:338:7: error: use of undeclared identifier '__builtin_sprintf' __builtin_sprintf(buf, "%lu", l); ^ /usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/ext/throw_allocator.h:342:7: error: use of undeclared identifier '__builtin_sprintf' __builtin_sprintf(buf, "%p", ref.first); ^ /usr/bin/../lib/gcc/x86_64-redhat-linux/9/../../../../include/c++/9/ext/throw_allocator.h:575:4: error: use of undeclared identifier '__builtin_sprintf' __builtin_sprintf(buf, "%f", random); ^ 6 errors generated.