Author: rnk Date: Fri Mar 2 13:41:08 2018 New Revision: 326622 URL: http://llvm.org/viewvc/llvm-project?rev=326622&view=rev Log: Don't claim that va_start has special semantic checks
We don't have special checks for BI_va_start in Sema::CheckBuiltinFunctionCall, so setting the 't' flag for va_start in Builtins.def disables semantic checking for it. That's not desired, and IRGen crashes when it tries to generate a call to va_start that doesn't have at least one argument. Follow-up to r322573 Fixes PR36565 Modified: cfe/trunk/include/clang/Basic/Builtins.def cfe/trunk/test/Sema/varargs.c Modified: cfe/trunk/include/clang/Basic/Builtins.def URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/Builtins.def?rev=326622&r1=326621&r2=326622&view=diff ============================================================================== --- cfe/trunk/include/clang/Basic/Builtins.def (original) +++ cfe/trunk/include/clang/Basic/Builtins.def Fri Mar 2 13:41:08 2018 @@ -803,7 +803,7 @@ LIBBUILTIN(_setjmpex, "iJ", "fj", "set // C99 library functions // C99 stdarg.h -LIBBUILTIN(va_start, "vA.", "fnt", "stdarg.h", ALL_LANGUAGES) +LIBBUILTIN(va_start, "vA.", "fn", "stdarg.h", ALL_LANGUAGES) LIBBUILTIN(va_end, "vA", "fn", "stdarg.h", ALL_LANGUAGES) LIBBUILTIN(va_copy, "vAA", "fn", "stdarg.h", ALL_LANGUAGES) // C99 stdlib.h Modified: cfe/trunk/test/Sema/varargs.c URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Sema/varargs.c?rev=326622&r1=326621&r2=326622&view=diff ============================================================================== --- cfe/trunk/test/Sema/varargs.c (original) +++ cfe/trunk/test/Sema/varargs.c Fri Mar 2 13:41:08 2018 @@ -112,3 +112,12 @@ void f13(enum E1 e, ...) { #endif __builtin_va_end(va); } + +void f14(int e, ...) { + // expected-warning@+3 {{implicitly declaring library function 'va_start'}} + // expected-note@+2 {{include the header <stdarg.h>}} + // expected-error@+1 {{too few arguments to function call}} + va_start(); + __builtin_va_list va; + va_start(va, e); +} _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits