1*f4a2713aSLionel Sambuc // RUN: %clang_cc1 %s -std=c++11 -fsyntax-only -verify -pedantic 2*f4a2713aSLionel Sambuc 3*f4a2713aSLionel Sambuc # 1 "/usr/include/string.h" 1 3 4 4*f4a2713aSLionel Sambuc extern "C" { 5*f4a2713aSLionel Sambuc typedef decltype(sizeof(int)) size_t; 6*f4a2713aSLionel Sambuc extern size_t strlen(const char *p); 7*f4a2713aSLionel Sambuc } 8*f4a2713aSLionel Sambuc 9*f4a2713aSLionel Sambuc # 10 "SemaCXX/constexpr-strlen.cpp" 2 10*f4a2713aSLionel Sambuc constexpr int n = __builtin_strlen("hello"); // ok 11*f4a2713aSLionel Sambuc constexpr int m = strlen("hello"); // expected-error {{constant expression}} expected-note {{non-constexpr function 'strlen' cannot be used in a constant expression}} 12*f4a2713aSLionel Sambuc 13*f4a2713aSLionel Sambuc // Make sure we can evaluate a call to strlen. 14*f4a2713aSLionel Sambuc int arr[3]; // expected-note {{here}} 15*f4a2713aSLionel Sambuc int k = arr[strlen("hello")]; // expected-warning {{array index 5}} 16