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[ORCA/C](https://github.com/byteworksinc/ORCA-C) is a C compiler that natively runs on and targets the Apple IIGS. ORCA/C and the programs it generates can be run on modern Linux systems by using an emulation tool called [Golden Gate](https://goldengate.gitlab.io). This adds support for ORCA/C (run via Golden Gate) in Compiler Explorer. It uses its own assembly format and objdumper (provided by Golden Gate), so support for those is added. An extra configuration option was also added to support execution via an emulator, bypassing the usual check that executables can run natively. Asm docs for the WDC 65C816 processor were also added. ORCA/C and Golden Gate are not Free Software, but their rights holders have given permission for them to be used on Compiler Explorer. Tarballs for them can be supplied privately. See infra PR: compiler-explorer/infra#1521 --------- Co-authored-by: Matt Godbolt <matt@godbolt.org>
How do I ?
This is a how-to guide for the user-interface presented by Compiler Explorer. This doesn't cover the details of how to set up or modify Compiler Explorer for your own needs. For that, please check the documents which already cover topics like:
- Adding a language
- Adding a compiler
- Adding a library
- Adding a tool
- and many more at compiler-explorer/docs
Fast links:
Change the assembly syntax from Intel
The option to switch assembly from Intel to AT&T syntax is present in the Output option of each compiler. If enough
space is not present, the option also presents itself as the gear symbol (⚙)
Compare the time taken by compilation and networking
This is the symbol that looks like a bar graph (📊). If your compilations are taking long, you can use this to check the time taken by:
- Networking, JavaScript, waiting for events, etc.
- Checking the cache and retrieving from it on a cache-hit
- Compilation (on force compilation or cache-miss)
- Parsing the generated assembly before presenting it
View intermediate information provided by the compilers
Though both GCC and Clang create supplementary outputs along with assembly (shown by default), and an executable (created if an executor has been added), the exact nature of the outputs and their formats differ between the compilers.
GCC allows the Tree, IPA, RTL and graph outputs, while Clang allows optimization, AST, IR and graph outputs. Some outputs (e.g. RTL or graph) also have a rich set of options in the UI to enable focussing on a particular function or compiler stage.