https://bugs.llvm.org/show_bug.cgi?id=37851
Bug ID: 37851
Summary: clang++ rejects legal code
Product: clang
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: zhong...@pku.org.cn
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
The code is as follow:
#include <iostream>
auto add_1(auto a, auto b) { return a + b;}
auto add_2 = [](auto a, auto b) { return a + b;};
int main()
{
std::cout
<< "a1: " << add_1(3.5, 4) << "\n"
<< "a2: " << add_1(3, 4.5) << "\n"
<< "a3: " << add_2(3.5, 4) << "\n"
<< "a4: " << add_2(3, 4.5) << "\n";
}
clang++ produces the error messages:
code0.c.cpp:3:12: error: 'auto' not allowed in function prototype
auto add_1(auto a, auto b) { return a + b;}
code0.c.cpp:3:20: error: 'auto' not allowed in function prototype
auto add_1(auto a, auto b) { return a + b;}
^~~~
2 errors generated.
g++ accepts the code. In fact, the code comes from a gcc bug report:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66197
The report says that a previous version of gcc compiles the above code into
incorrect binary code, so the above program produces wrong values. It is
interesting to explore whether clang++ has similar problems, right?
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