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Comment by meghprkh

1 hour ago

Why would they not do something like?

  + #if !(defined __GLIBC_COMPILER_SUPPORTS_ATTRIBUTES__)
  - #if !(defined __GNUC__ || defined __clang__ || defined __TINYC__)
  # define __attribute__(xyz)     /* Ignore */
  #endif

(or probably a more fine grained for each attribute they try to use)

Considering such checks are fairly conventional in downstream C++ libraries based on compilers (for example checking OS platform or compiler, e.g. [Boost.Config](https://www.boost.org/doc/libs/latest/libs/config/). Modern C++ even went ahead and standardized this somewhat https://en.cppreference.com/cpp/utility/feature_test )

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