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% CPSC(1)
# NAME
cpsc - compile and run CIE pseudocode
# SYNOPSIS
**cpsc** [**-r**] [**-o** *output*] *source*
# DESCRIPTION
Compile one pseudocode source file to LLVM IR. Options may appear before or after the source path. Source input from stdin is not supported.
Without **-o** or **-r**, replace the source filename's extension with `.ir` and save the output beside the source file.
# OPTIONS
**-o** *output*
: Save IR to the specified path. May be specified only once. With **-r**, keep this file even if execution fails.
**-r**
: Run the compiled program with the runner selected at build time (see BUILD MODES). Without **-o**, do not save permanent IR. The program inherits stdin, stdout and stderr; `INPUT` can read terminal or piped input.
# BUILD MODES
Initial CMake configuration requires **-DCPSC_RUN_MODE=PATH**, **EMBEDDED** or **NONE**. No mode is selected by default. All modes compile to IR using LLVM libraries built into the compiler; NONE disables execution, not IR generation.
**PATH**
: Run `lli` from PATH. If it cannot be found, **-r** fails before compilation or output writing. Without **-o**, write temporary IR and delete it afterward, including on execution failure.
**EMBEDDED**
: Run the statically linked LLVM engine inside `cpsc`, without looking for `lli` in PATH. Without **-o**, execute the module in memory. Users do not need LLVM or `lli` installed; the executable may still depend on the operating system's C runtime libraries.
**NONE**
: Reject **-r** with an error before compilation or output writing. Compilation to IR remains available.
# EXAMPLES
Compile and save `test.ir` beside `test.cps`:
```sh
cpsc test.cps
```
Choose the output path:
```sh
cpsc test.cps -o result.ir
```
Run without saving permanent IR:
```sh
cpsc test.cps -r
```
Save IR and run it:
```sh
cpsc test.cps -r -o result.ir
```
# EXIT STATUS
**0**
: Compilation succeeded. Invoking `cpsc` with no arguments also exits silently with status 0.
**1**
: An argument, file, compilation or execution-engine error occurred, including when PATH mode cannot find `lli` or NONE mode receives **-r**.
With **-r**, return the executed program's exit status. In PATH mode, failure to launch `lli` or a child-process crash returns 1.
# NOTES
Compiler diagnostics go to stderr. Failed compilation does not write IR. Successful compilation overwrites an existing output file, but an output path that refers to the source file (including a symbolic or hard link) is rejected.
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