[issue21461] Recognize -pthread

[Thomas Klausner]

Thomas Klausner <tk at giga.or.at> added the comment:

gcc supports this flag. According to the man page:

This option consistently for both compilation and linking.  This option is supported on GNU/Linux targets, most other Unix derivatives, and also on x86 Cygwin and MinGW targets.

On NetBSD, using -pthread is the recommended method to enable thread support.

clang on NetBSD also supports this flag. I don't have access to clang on other systems.

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