A guide to building programs for ARM, AArch64, RISC-V, or MIPS computers from an x86-64 computer using GCC. It covers target settings, system libraries, CMake, and running the result with QEMU, a processor emulator.

Use it to configure GCC cross-compilers, system-library paths, pkg-config, CMake toolchain files, and QEMU-based checks for cross-built programs.

It prevents host libraries and settings from being mixed into the target build, and explains errors such as “Exec format error” and “wrong ELF class.”

cross-gcc — Skill for Codex by OutlineDriven

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add OutlineDriven/outline-driven-development --skill cross-gcc

Clone the repo

git clone --depth 1 https://github.com/OutlineDriven/outline-driven-development

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/cross-gcc/github.svg)](https://agentmods.dev/skills/outlinedriven/outline-driven-development/cross-gcc)

Your own site

<a href="https://agentmods.dev/skills/outlinedriven/outline-driven-development/cross-gcc"><img src="https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/cross-gcc/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/outlinedriven/outline-driven-development/cross-gcc"><img src="https://agentmods.dev/badge/skills/outlinedriven/outline-driven-development/cross-gcc.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,731 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00059	$0.01731
Opus 5	$0.00030	$0.00865
Sonnet 5	$0.00012	$0.00346
Haiku 4.5	$0.00006	$0.00173

Measured 3d ago against content hash df93b7149093, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

cross-gcc scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.devin/skills/cross-gcc/SKILL.md · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cross-compilation with GCC

Contract

Field	Bound contract
Trigger	The user needs to build for a different architecture with a `<triplet>-gcc` toolchain, gets `Exec format error` or `wrong ELF class`, finds host libraries leaking into a cross link, or wants to run and debug a cross-built binary under QEMU.
Authority	Read-only. The skill emits install commands, compiler invocations, environment settings, and a toolchain file to chat; the user runs them. Rollback is not needed. No remote mutation.
Side effect	Chat output. Confirmation compiles run on scratch files.
Done	The triplet, toolchain, sysroot, and build-system wiring are stated for the target, every flag is confirmed against the GCC target-options documentation or the installed cross compiler, and each error in the request has a cause and fix.

Inputs

Target: required. Architecture, OS or bare metal, ABI, and CPU when known.
Host distribution: required for install commands; the package names below are Debian and Ubuntu names.
Whether the program links target libraries beyond libc: required; decides whether a sysroot is needed.
Build system: required. Plain compiler, Make, autoconf, or CMake.
GCC line of the cross compiler, from <triplet>-gcc --version: required. Current stable is GCC 16.2; distribution cross packages often lag.

Procedure

Choose the triplet <arch>-<vendor>-<os>-<abi>, three or four parts. Common values: aarch64-linux-gnu (64-bit ARM, glibc), arm-linux-gnueabihf (32-bit ARM, hard float), arm-none-eabi (bare-metal ARM), riscv64-linux-gnu, mipsel-linux-gnu, x86_64-w64-mingw32 (Windows from Linux). Done when: one triplet is chosen.
Install and confirm the toolchain. Debian and Ubuntu: apt install gcc-aarch64-linux-gnu g++-aarch64-linux-gnu binutils-aarch64-linux-gnu; bare-metal ARM: apt install gcc-arm-none-eabi. Confirm with aarch64-linux-gnu-gcc --version. Done when: the compiler prints its version.
Compile. Hosted: aarch64-linux-gnu-gcc -O2 -o hello hello.c, aarch64-linux-gnu-g++ -O2 -std=c++20 -o hello hello.cpp. Bare-metal Cortex-M4: arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -ffreestanding -nostdlib -nostartfiles -T linker.ld -o firmware.elf startup.s main.c. Target flags from the reference: -march, -mcpu, -mthumb, -mfloat-abi=soft|softfp|hard, -mfpu, and for AArch64 -moutline-atomics; RISC-V uses -march=rv64gc -mabi=lp64d style ISA strings. Done when: the compile command names the CPU and ABI.
Add a sysroot when the program links target libraries: --sysroot=/path/to/sysroot on every compile and link. Sources: a vendor image, debootstrap --arch arm64 <suite> <dir> for Debian, or the Yocto or Buildroot output tree. Confirm with aarch64-linux-gnu-gcc --sysroot=<dir> -v -E - < /dev/null 2>&1 | grep sysroot. Done when: the sysroot path appears in the compiler's verbose output.
Redirect pkg-config, which returns host paths by default: export PKG_CONFIG_SYSROOT_DIR=<sysroot>, export PKG_CONFIG_LIBDIR=$PKG_CONFIG_SYSROOT_DIR/usr/lib/aarch64-linux-gnu/pkgconfig:$PKG_CONFIG_SYSROOT_DIR/usr/share/pkgconfig, export PKG_CONFIG_PATH=. Check with pkg-config --libs <lib>. Done when: the printed paths are under the sysroot.
Wire the build system. Environment for Make and autoconf: CC, CXX, AR, STRIP, OBJDUMP set to the triplet-prefixed tools, and ./configure --host=aarch64-linux-gnu. CMake toolchain file:

Read the full file on GitHub · 71 lines

Files

What ships with it

2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

3d ago First seen · 71 lines · 59 tokens per session scan A df93b7149093

Subscribe to this mod's changes

cross-gcc is a skill published in the GitHub repository OutlineDriven/outline-driven-development (52 stars, last pushed 3d ago), licensed Apache-2.0. It adds 59 tokens to every session and 1,731 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-06.

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