Compile error with GCC 11 WITH_STL=On

[tyler92]

Describe your environment

gcc (Ubuntu 11.1.0-1ubuntu1~20.04) 11.1.0
cmake version 3.25.1
Ubuntu 20.04

Steps to reproduce

cmake -DBUILD_TESTING=OFF -DWITH_EXAMPLES_HTTP=ON -DWITH_PROMETHEUS=ON -DWITH_STL=ON ..
make

What is the expected behavior?

No compile errors

What is the actual behavior?

The following error:

In file included from opentelemetry-cpp/examples/http/client.cc:7:
opentelemetry-cpp/examples/http/tracer_common.h:29:26: error: expected ‘)’ before ‘&’ token
   29 |   HttpTextMapCarrier<T>(T &headers) : headers_(headers) {}

Additional context

https://godbolt.org/z/Pv3fqq7zx

[marcalff]

Thanks for the report.

According to the compiler explorer link provided (thanks), the code:

• build with GCC 11.3 with C++11, C++14, C++17
• breaks with GCC 11.3 with C++20

which is probably why this did not get detected so far.