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Re:State of the OpenVMS Port to x86_64 [pdf] by hsivonen on Wednesday October 12, 2016 @04:22PM (#12696140)
Interesting that they have a non-clang C front end. Did DEC have weird vendor-specifoc extensions to C?
Re:State of the OpenVMS Port to x86_64 [pdf] by ch_123 on Wednesday October 12, 2016 @04:53PM (#12696347)
Yes, see the appendices of http://h41361.www4.hpe.com/docs/base_doc/DOCUMENTATION/V40F_...

The original VMS C compiler targeted a pre-ANSI "VAX C" dialect which had further differences. DEC C replaced it on the Alpha (I don't think it was backported to the VAX)