[llvm-bugs] [Bug 32926] New: clang fails to compile constexpr with -O0/-O1

via llvm-bugs llvm-bugs at lists.llvm.org
Thu May 4 10:48:47 PDT 2017


            Bug ID: 32926
           Summary: clang fails to compile constexpr with -O0/-O1
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: Vsevolod.Livinskij at frtk.ru
                CC: llvm-bugs at lists.llvm.org

Created attachment 18411
  --> https://bugs.llvm.org/attachment.cgi?id=18411&action=edit

clangc fails to compile constexpr at -O0 and -O2 with -std=c++11 and

>$ cat repr.cpp 
#include <iostream>
#include <utility>

template<typename T>
void foo() {
    std::cout << T::debug_typeid << std::endl;
    std::make_pair(T::debug_typeid, T::debug_typeid);

struct A {
    static constexpr uint32_t debug_typeid = 1;

int main () {

>$ clang++ -std=c++11 repr.cpp -O0 ; ./a.out
/tmp/repr-ac99cc.o: In function `void foo<A>()':
repr.cpp:(.text._Z3fooI1AEvv[_Z3fooI1AEvv]+0x30): undefined reference to
clang-5.0: error: linker command failed with exit code 1 (use -v to see

clang version 5.0.0 (trunk 302068)

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