Merge pull request #495 from CCnut/main

Fix: Android build problem
Relates to #278

README.md

@@ -32,7 +32,7 @@ Spatial • Binary • Probabilistic • User-Defined Metrics
 <a href="https://unum-cloud.github.io/usearch/golang">GoLang</a> •
 <a href="https://unum-cloud.github.io/usearch/wolfram">Wolfram</a>
 <br/>
-Linux • MacOS • Windows • iOS • WebAssembly •
+Linux • MacOS • Windows • iOS • Android • WebAssembly •
 <a href="https://unum-cloud.github.io/usearch/sqlite">SQLite3</a>
 </p>
 

build.rs

@@ -46,36 +46,37 @@ fn main() {
     };
 
     if cfg!(feature = "simsimd") {
-        build.define("USEARCH_USE_SIMSIMD", "1")
-        .define("SIMSIMD_DYNAMIC_DISPATCH", "1")
-        .define("SIMSIMD_NATIVE_BF16", "0")
-        .define("SIMSIMD_NATIVE_F16", "0");
+        build
+            .define("USEARCH_USE_SIMSIMD", "1")
+            .define("SIMSIMD_DYNAMIC_DISPATCH", "1")
+            .define("SIMSIMD_NATIVE_BF16", "0")
+            .define("SIMSIMD_NATIVE_F16", "0");
 
         for flag in &flags_to_try {
             build.define(flag, "1");
         }
     } else {
         build.define("USEARCH_USE_SIMSIMD", "0");
     }
-
 
+    let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap();
     // Conditional compilation depending on the target operating system.
-    if cfg!(target_os = "linux") {
+    if target_os == "linux" || target_os == "android" {
         build
             .flag_if_supported("-std=c++17")
             .flag_if_supported("-O3")
             .flag_if_supported("-ffast-math")
             .flag_if_supported("-fdiagnostics-color=always")
             .flag_if_supported("-g1"); // Simplify debugging
-    } else if cfg!(target_os = "macos") {
+    } else if target_os == "macos" {
         build
             .flag_if_supported("-mmacosx-version-min=10.15")
             .flag_if_supported("-std=c++17")
             .flag_if_supported("-O3")
             .flag_if_supported("-ffast-math")
             .flag_if_supported("-fcolor-diagnostics")
             .flag_if_supported("-g1"); // Simplify debugging
-    } else if cfg!(target_os = "windows") {
+    } else if target_os == "windows" {
         build
             .flag_if_supported("/std:c++17")
             .flag_if_supported("/O2")

include/usearch/index.hpp

@@ -27,6 +27,9 @@
 #define USEARCH_DEFINED_APPLE
 #elif defined(__linux__)
 #define USEARCH_DEFINED_LINUX
+#if defined(__ANDROID_API__)
+#define USEARCH_DEFINED_ANDROID
+#endif
 #endif
 
 // Inferring the compiler: Clang vs GCC

include/usearch/index_plugins.hpp

@@ -774,9 +774,9 @@ class aligned_allocator_gt {
         std::size_t alignment = alignment_ak;
 #if defined(USEARCH_DEFINED_WINDOWS)
         return (pointer)_aligned_malloc(length_bytes, alignment);
-#elif defined(USEARCH_DEFINED_APPLE)
+#elif defined(USEARCH_DEFINED_APPLE) || defined(USEARCH_DEFINED_ANDROID)
         // Apple Clang keeps complaining that `aligned_alloc` is only available
-        // with macOS 10.15 and newer, so let's use `posix_memalign` there.
+        // with macOS 10.15 and newer or Android API >= 28, so let's use `posix_memalign` there.
         void* result = nullptr;
         int status = posix_memalign(&result, alignment, length_bytes);
         return status == 0 ? (pointer)result : nullptr;