Add support for unsupported systems

[rail5]

Bash++ supports any GNU/Linux system.

Portability of supershells

Supershells are known to break on MacOS and Haiku. At the moment, they rely on the non-standardized /dev/fd interface. This should be made more portable

Notes

• The test suite requires GNU Grep
• The makefiles must be manually edited to point to the location of the ANTLR4 libraries. On MacOS, the format of the date command must also be modified in the makefile.
  • Time to start using autotools?

Untested Systems

• Any of the BSDs
• Solaris

Other Known Issues

• Ubuntu 24.04
  • (2024-02-07) Bash++ does not compile properly on Ubuntu 24.04 because their package management system is broken. Ubuntu ships package antlr4 version 4.9.2 and ships libantlr-runtime-dev version 4.10. These two versions are incompatible with each other. This is not a problem with the Bash++ compiler, this is a problem with Ubuntu's package repositories
  • The Bash++ compiler (and its generated code) however of course run perfectly well on Ubuntu, if Ubuntu is given a pre-compiled binary of bpp
  • The Bash++ compiler builds perfectly fine on Ubuntu 22.04