first commit

scripts/setup-gcc.sh

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+#!/usr/bin/env bash
+# 通过清华 TUNA 镜像为 MSYS2 安装 mingw-w64 gcc（Fyne/cgo 必需）
+set -e
+
+for f in /etc/pacman.d/mirrorlist.*; do
+  sed -i 's|repo.msys2.org|mirrors.tuna.tsinghua.edu.cn/msys2|g' "$f"
+done
+
+echo "--- mirror ---"
+grep -m1 '^Server' /etc/pacman.d/mirrorlist.mingw64 || true
+
+echo "--- sync db ---"
+pacman -Sy --noconfirm
+
+echo "--- install gcc ---"
+pacman -S --noconfirm --needed mingw-w64-x86_64-gcc
+
+echo "--- verify ---"
+/mingw64/bin/gcc.exe --version | head -n 1