(as) ESA/390 Notes

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 9.12.1 Notes
 ------------
 
 The ESA/390 `as' port is currently intended to be a back-end for the
 GNU CC compiler.  It is not HLASM compatible, although it does support
 a subset of some of the HLASM directives.  The only supported binary
 file format is ELF; none of the usual MVS/VM/OE/USS object file
 formats, such as ESD or XSD, are supported.
 
    When used with the GNU CC compiler, the ESA/390 `as' will produce
 correct, fully relocated, functional binaries, and has been used to
 compile and execute large projects.  However, many aspects should still
 be considered experimental; these include shared library support,
 dynamically loadable objects, and any relocation other than the 31-bit
 relocation.
 

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