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Writing pascal

Skill gerph/riscos-agent-skills/skills/writing-pascal

Use when writing, reading, updating, building, or reviewing Pascal code in the RISC OS build environment, especially when compiling with riscos-p2cc/riscos64-p2cc, creating a pcommand project with riscos-project, or building for 32-bit and 64-bit RISC OS.From its SKILL.md

Install
npx -y skills add gerph/riscos-agent-skills --skill writing-pascal

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SKILL.md

2.4 KB, 545 tokens by cl100k_base, as published. Nobody here has run it

Writing Pascal for RISC OS

Use this skill for Pascal work in the RISC OS build environment.

Read only the reference files needed for the task:

  • Build, source layout, and command lines (32-bit and 64-bit, direct and project builds): references/building.md
  • Common pitfalls, language quirks, and review checks: references/pitfalls.md

Core Rules

Pascal source is translated to ANSI C by the P2C translator, then compiled and linked with the normal C toolchain. riscos-p2cc (32-bit and 26-bit) and riscos64-p2cc (64-bit) drive translation, compilation, and linking together.

Pascal source files live in p/. Unlike the C, C++, and Fortran wrappers, riscos-p2cc takes the host path directly, so pass p/hello, not p.hello or hello.p.

Always pass -26, -32, or -64 explicitly. Without one, riscos-p2cc defaults to 26-bit code, which fails at run time with 26 bit absolute files are not executable on this system on a 32-bit or 64-bit system.

The o/ directory must exist before compiling with a 32-bit target, even for a combined translate-compile-link command; the 32-bit compiler writes an intermediate object there. The 64-bit compiler does not need this.

Do not print a real value with write/writeln in a 32-bit build. This currently produces incorrect output (0.0, or garbage for an unformatted writeln) due to a variadic-double calling-convention bug in the 32-bit toolchain. real arithmetic and comparisons are unaffected, and 64-bit builds print real values correctly. If a 32-bit program must show a computed value, convert with trunc/round to an integer, or target 64-bit.

To create a project: riscos-project create --type pcommand --name <name> --skeleton, then riscos-amu for 32-bit or riscos-amu BUILD64=1 for 64-bit.

Assignment is :=, comparison is =. Boolean operators are the words and, or, not. Array bounds are declared explicitly (eg array[1..3] of integer), not fixed at a language-defined start index.

What ships with it: 3 files

6.0 KB alongside SKILL.md

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references/

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