Hi, Brandon. pthread_key_t is a type used to identify thread-local data using the "pthread" library that's available on most platforms. You can find out what pthread_key_t is for FreeBSD by looking in the C header pthread.h for a typedef that defines that type…or by just compiling an invalid C program like this one:

#include <pthread.h>
void test(void) {
  pthread_key_t incorrect = "incorrect value";
}

On my machine, this results in a warning:

warning: incompatible pointer to integer conversion initializing
      'pthread_key_t' (aka 'unsigned long') with an expression of type
      'void (*)(void)' [-Wint-conversion]

which tells me what the type of pthread_key_t is (unsigned long).

If you do pick this up, we'd love to get a pull request from you when you've made the necessary changes!

Comment by Brandon Bradley (JIRA)

@belkadan Where is swift/stdlib/public//SwiftSchims/LibSchims.h getting the answer to this evaluation?:

#if defined(__linux__)

That is, is the 'defined' function generated by Swift, or is it a platform function?

For FreeBSD pthread_key_t is an int, but to make an acceptable pull, I need to add another if after the above code.

This is C++ code, not Swift code. #if defined(__linux__) is equivalent to #ifdef __linux__, where __linux__ is a macro defined by the compiler when compiling for Linux.

It looks like someone else may have taken this up already: #9940

Comment by Brandon Bradley (JIRA)

Implementing the changes in the Pull Request resolve the issue.

PR merged!