What is xmake-fortran?

A build guide for Fortran projects in xmake. Fortran is a programming language commonly used for scientific and numerical software, while xmake manages compilation.

Use it to build Fortran source files with GNU or Intel compilers, create programs or libraries, and mix Fortran and C code.

It shows how to choose Fortran compilers, define executable or library targets, set compiler options, and connect Fortran with C.

xmake-fortran — Skill for Claude Code by xmake-io

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 xmake-io/xmake-skills --skill xmake-fortran

Clone the repo

git clone --depth 1 https://github.com/xmake-io/xmake-skills

Made for: Claude Code.

Or install xmake-skills, the plugin that ships this one along with the rest of its 58 skills.

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/xmake-io/xmake-skills/xmake-fortran/github.svg)](https://agentmods.dev/skills/xmake-io/xmake-skills/xmake-fortran)

Your own site

<a href="https://agentmods.dev/skills/xmake-io/xmake-skills/xmake-fortran"><img src="https://agentmods.dev/badge/skills/xmake-io/xmake-skills/xmake-fortran/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/xmake-io/xmake-skills/xmake-fortran"><img src="https://agentmods.dev/badge/skills/xmake-io/xmake-skills/xmake-fortran.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 794 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	$0.00056	$0.00794
Opus 5	$0.00028	$0.00397
Sonnet 5	$0.00011	$0.00159
Haiku 4.5	$0.00006	$0.00079

Measured 11d ago against content hash 5ca26cfdc702, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

xmake-fortran 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 11d 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.

skills/languages/xmake-fortran/SKILL.md · 90 lines

How it starts

The opening of the file, as written. The whole thing — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Building Fortran with Xmake

Xmake supports Fortran since v2.3.6 via gfortran, and Intel Fortran (ifort) since v2.3.8.

1. Minimal project

xmake create -l fortran -t console hello
cd hello
xmake run

add_rules("mode.debug", "mode.release")

target("hello")
    set_kind("binary")
    add_files("src/*.f90")

Recognized extensions: .f, .F, .f90, .F90, .f95, .F95, .f03, .F03, .f08, .F08, .for, .FOR. The uppercase variants get preprocessed.

2. Target kinds

target("app")       set_kind("binary")
target("mylib")     set_kind("static")
target("mydyn")     set_kind("shared")

3. Compiler selection

xmake f --toolchain=gfortran              # default gfortran
xmake f --toolchain=ifort                 # Intel Fortran
xmake f --toolchain=ifx                   # Intel oneAPI LLVM-based Fortran

Pin a specific install with --sdk=/opt/intel/oneapi.

4. Flags

target("app")
    add_files("src/*.f90")
    add_fcflags("-O3", "-ffree-form")           -- gfortran flags
    add_ldflags("-lm")

add_fcflags = Fortran compiler flags.

5. Mixing Fortran with C

target("solver")
    set_kind("static")
    add_files("src/*.f90", "src/*.c")
    add_includedirs("include", {public = true})

target("app")
    set_kind("binary")
    add_files("src/main.cpp")
    add_deps("solver")
    set_languages("c++17")

Use iso_c_binding on the Fortran side and extern "C" on the C++ side. Xmake handles the link step — gfortran's runtime is added automatically when Fortran objects are present.

6. Modules (Fortran modules, not C++ modules)

Fortran module/end module produces .mod files. Xmake tracks them automatically for dependency ordering — list source files in add_files in any order; xmake scans USE statements.

Pitfalls

Fixed-form vs free-form. .f/.for default to fixed form (columns matter); .f90+ default to free form. Flag overrides work per-file if needed.
.mod leaking across targets. Each target has its own module cache. Share modules by linking the static/shared library and letting xmake propagate the -I path.
Intel compiler flag dialect. ifort and ifx differ from gfortran in many flag names. Gate with is_toolchain.
Mixing Fortran and C++ without a C intermediate. Fortran↔C++ name mangling is messy; always bridge through a C layer.

Read the full file on GitHub · 90 lines

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.

11d ago First seen · 90 lines · 56 tokens per session scan A 5ca26cfdc702

Subscribe to this mod's changes

xmake-fortran is a skill published in the GitHub repository xmake-io/xmake-skills (24 stars, last pushed 18d ago), licensed Apache-2.0. It adds 56 tokens to every session and 794 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 2026-08-30.

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