feat: cross-compile for android (! for termux users) (#264)

* feat: cross-compile for android (! for termux users)

* chore: Update docs for - feat: cross-compile for android (! for termux users)

Author: dmtrKovalenko

.cargo/config.toml

@@ -10,12 +10,7 @@ rustflags = ["-C", "target-feature=-crt-static"]
 [target.aarch64-unknown-linux-musl]
 rustflags = ["-C", "target-feature=-crt-static"]
 
+# Android/Termux: no hardcoded linker so native Termux builds use the system cc.
+# For CI cross-compilation the linker is set via CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER env var.
 [target.aarch64-linux-android]
-rustflags = [
-  "-C",
-  "linker=aarch64-linux-android-clang",
-  "-C",
-  "link-args=-rdynamic",
-  "-C",
-  "default-linker-libraries",
-]
+rustflags = ["-C", "link-args=-rdynamic"]

.github/workflows/release.yaml

@@ -2,7 +2,7 @@ name: Prebuild
 
 on:
   push:
-    branches: [main, feat/interchangable-ffi]
+    branches: [main, feat/interchangable-ffi, feat/termux]
   pull_request:
 
 jobs:
@@ -36,6 +36,12 @@ jobs:
             artifact_name: target/aarch64-unknown-linux-musl/release/libfff_nvim.so
             ext: so
 
+          ## Android (Termux)
+          - os: ubuntu-latest
+            target: aarch64-linux-android
+            artifact_name: target/aarch64-linux-android/release/libfff_nvim.so
+            ext: so
+
           ## macOS builds
           - os: macos-latest
             target: x86_64-apple-darwin
@@ -73,11 +79,25 @@ jobs:
         run: cargo install cargo-zigbuild
 
       - name: Build for Linux
-        if: contains(matrix.os, 'ubuntu')
+        if: contains(matrix.os, 'ubuntu') && !contains(matrix.target, 'android')
         run: |
           cargo zigbuild --release --target ${{ matrix.zigbuild_target || matrix.target }} -p fff-nvim
           mv "${{ matrix.artifact_name }}" "${{ matrix.target }}.${{ matrix.ext }}"
 
+      - name: Build for Android (Termux)
+        if: contains(matrix.target, 'android')
+        run: |
+          NDK_BIN="$ANDROID_NDK/toolchains/llvm/prebuilt/linux-x86_64/bin"
+
+          # NDK clang for C deps (libgit2, lmdb, blake3) that need Bionic sysroot headers
+          export CC_aarch64_linux_android="$NDK_BIN/aarch64-linux-android24-clang"
+          export CXX_aarch64_linux_android="$NDK_BIN/aarch64-linux-android24-clang++"
+          export AR_aarch64_linux_android="$NDK_BIN/llvm-ar"
+          export CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER="$NDK_BIN/aarch64-linux-android24-clang"
+
+          cargo build --release --target ${{ matrix.target }} -p fff-nvim
+          mv "${{ matrix.artifact_name }}" "${{ matrix.target }}.${{ matrix.ext }}"
+
       - name: Build for macOS
         if: contains(matrix.os, 'macos')
         run: |
@@ -137,6 +157,13 @@ jobs:
             lib_filename: libfff_c.so
             ext: so
 
+          ## Android (Termux)
+          - os: ubuntu-latest
+            target: aarch64-linux-android
+            artifact_name: target/aarch64-linux-android/release/libfff_c.so
+            lib_filename: libfff_c.so
+            ext: so
+
           ## macOS builds
           - os: macos-latest
             target: x86_64-apple-darwin
@@ -183,11 +210,24 @@ jobs:
         run: cargo install cargo-zigbuild
 
       - name: Build for Linux
-        if: contains(matrix.os, 'ubuntu')
+        if: contains(matrix.os, 'ubuntu') && !contains(matrix.target, 'android')
         run: |
           cargo zigbuild --release --target ${{ matrix.zigbuild_target || matrix.target }} -p fff-c
           mv "${{ matrix.artifact_name }}" "c-lib-${{ matrix.target }}.${{ matrix.ext }}"
 
+      - name: Build for Android (Termux)
+        if: contains(matrix.target, 'android')
+        run: |
+          NDK_BIN="$ANDROID_NDK/toolchains/llvm/prebuilt/linux-x86_64/bin"
+
+          export CC_aarch64_linux_android="$NDK_BIN/aarch64-linux-android24-clang"
+          export CXX_aarch64_linux_android="$NDK_BIN/aarch64-linux-android24-clang++"
+          export AR_aarch64_linux_android="$NDK_BIN/llvm-ar"
+          export CARGO_TARGET_AARCH64_LINUX_ANDROID_LINKER="$NDK_BIN/aarch64-linux-android24-clang"
+
+          cargo build --release --target ${{ matrix.target }} -p fff-c
+          mv "${{ matrix.artifact_name }}" "c-lib-${{ matrix.target }}.${{ matrix.ext }}"
+
       - name: Build for macOS
         if: contains(matrix.os, 'macos')
         run: |
@@ -206,6 +246,7 @@ jobs:
           mv "${{ matrix.artifact_name }}" "c-lib-${{ matrix.target }}.${{ matrix.ext }}"
 
       - name: Prepare npm package
+        if: "!contains(matrix.target, 'android')"
         shell: bash
         run: |
           # Copy the built binary into the platform npm package directory
@@ -218,6 +259,7 @@ jobs:
           path: c-lib-${{ matrix.target }}.*
 
       - name: Upload npm package artifact
+        if: "!contains(matrix.target, 'android')"
         uses: actions/upload-artifact@v4
         with:
           name: npm-${{ matrix.npm_package }}

Cargo.lock

@@ -28,7 +28,7 @@ heed = "0.22.0"
 ignore = "0.4.22"
 memmap2 = "0.9"
 mimalloc = "0.1.47"
-zlob = "1.2.9"
+zlob = "1.3.0"
 
 mlua = { version = "0.11.1", features = ["module", "luajit"] }
 neo_frizbee = "0.8.1"

Cargo.toml

@@ -1,4 +1,4 @@
-*fff.nvim.txt*        For Neovim >= 0.10.0       Last change: 2026 February 26
+*fff.nvim.txt*        For Neovim >= 0.10.0       Last change: 2026 February 28
 
 ==============================================================================
 Table of Contents                                 *fff.nvim-table-of-contents*

doc/fff.nvim.txt

@@ -11,18 +11,24 @@ function M.get_triple()
   if os_name == 'darwin' then
     os_name = 'apple-darwin'
   elseif os_name == 'linux' then
-    -- Detect if we're on musl or glibc
-    local handle = io.popen('ldd --version 2>&1')
-    if handle then
-      local output = handle:read('*a')
-      handle:close()
-      if output and output:match('musl') then
-        os_name = 'unknown-linux-musl'
+    -- Detect Android/Termux before checking musl/glibc.
+    -- Termux uses Bionic libc (not glibc or musl) and has no ldd.
+    if os.getenv('TERMUX_VERSION') or os.getenv('ANDROID_ROOT') then
+      os_name = 'linux-android'
+    else
+      -- Detect if we're on musl or glibc
+      local handle = io.popen('ldd --version 2>&1')
+      if handle then
+        local output = handle:read('*a')
+        handle:close()
+        if output and output:match('musl') then
+          os_name = 'unknown-linux-musl'
+        else
+          os_name = 'unknown-linux-gnu'
+        end
       else
         os_name = 'unknown-linux-gnu'
       end
-    else
-      os_name = 'unknown-linux-gnu'
     end
   elseif os_name:match('windows') or os_name:match('mingw') or os_name:match('msys') then
     os_name = 'pc-windows-msvc'