Fix minimum Android API version and linking errors

The minimum supported API version must be specified when building the native libraries, otherwise this may cause linking errors when launching the app.

The minimum API level is increased to 24 (Android 7.0, covering 97.2% of usages) because:

- Vulkan is only available from API 24+ on ARM64 and x64.
- curl only compiles with API 23+.
- The NDK version we use supports only API 21+.

Ensure that the C++/Linker flags are set when building Android libraries, which was causing errors due to `-fPIC` not being set for all libraries.

scripts/android/cmake_android.sh

@@ -10,7 +10,8 @@ ANDROID_NDK_VERSION="${ANDROID_NDK_VERSION:2}"
 # ANDROID_NDK_HOME must be exported for cargo-ndk
 export ANDROID_NDK_HOME="$ANDROID_HOME/ndk/$ANDROID_NDK_VERSION"
 
-ANDROID_API_LEVEL=34
+# ANDROID_API_LEVEL must specify the _minimum_ supported SDK version, otherwise this will cause linking errors at launch
+ANDROID_API_LEVEL=24
 ANDROID_SUB_BUILD_DIR=build_arch
 
 COLOR_RED="\e[1;31m"

scripts/android/files/build.gradle

@@ -21,7 +21,7 @@ android {
 	defaultConfig {
 		applicationId "org.ddnet.client"
 		namespace("org.ddnet.client")
-		minSdkVersion 19
+		minSdkVersion 24
 		targetSdkVersion 34
 		versionCode TW_VERSION_CODE
 		versionName "TW_VERSION_NAME"

scripts/compile_libs/cmake_lib_compile.sh

@@ -29,6 +29,8 @@ function compile_source_android() {
 		-DCMAKE_SYSTEM_NAME=Android \
 		-DCMAKE_SYSTEM_VERSION="$1" \
 		-DCMAKE_ANDROID_ARCH_ABI="${3}" \
+		-DCMAKE_C_FLAGS="$COMPILEFLAGS" -DCMAKE_CXX_FLAGS="$COMPILEFLAGS" -DCMAKE_CXX_FLAGS_RELEASE="$COMPILEFLAGS" -DCMAKE_C_FLAGS_RELEASE="$COMPILEFLAGS" \
+		-DCMAKE_SHARED_LINKER_FLAGS="$LINKFLAGS" -DCMAKE_SHARED_LINKER_FLAGS_RELEASE="$LINKFLAGS" \
 		-B"$2" \
 		-DBUILD_SHARED_LIBS=OFF \
 		-DHIDAPI_SKIP_LIBUSB=TRUE \

scripts/compile_libs/gen_libs.sh

@@ -46,7 +46,8 @@ fi
 mkdir -p "$1"
 cd "$1" || exit 1
 
-_ANDROID_ABI_LEVEL=34
+# ANDROID_API_LEVEL must specify the _minimum_ supported SDK version, otherwise this will cause linking errors at launch
+ANDROID_API_LEVEL=24
 
 function build_cmake_lib() {
 	if [ ! -d "${1}" ]; then
@@ -59,7 +60,7 @@ function build_cmake_lib() {
 	(
 		cd "${1}" || exit 1
 		cp "${CURDIR}"/scripts/compile_libs/cmake_lib_compile.sh cmake_lib_compile.sh
-		./cmake_lib_compile.sh "$_ANDROID_ABI_LEVEL" "$OS_NAME" "$COMPILEFLAGS" "$LINKFLAGS"
+		./cmake_lib_compile.sh "$ANDROID_API_LEVEL" "$OS_NAME" "$COMPILEFLAGS" "$LINKFLAGS"
 	)
 }
 
@@ -74,7 +75,7 @@ cd compile_libs || exit 1
 	(
 		cd openssl || exit 1
 		cp "${CURDIR}"/scripts/compile_libs/make_lib_openssl.sh make_lib_openssl.sh
-		./make_lib_openssl.sh "$_ANDROID_ABI_LEVEL" "$OS_NAME" "$COMPILEFLAGS" "$LINKFLAGS"
+		./make_lib_openssl.sh "$ANDROID_API_LEVEL" "$OS_NAME" "$COMPILEFLAGS" "$LINKFLAGS"
 	)
 )
 
@@ -97,7 +98,7 @@ build_cmake_lib opus https://github.com/xiph/opus
 		./autogen.sh
 	fi
 	cp "${CURDIR}"/scripts/compile_libs/make_lib_opusfile.sh make_lib_opusfile.sh
-	./make_lib_opusfile.sh "$_ANDROID_ABI_LEVEL" "$OS_NAME" "$COMPILEFLAGS" "$LINKFLAGS"
+	./make_lib_opusfile.sh "$ANDROID_API_LEVEL" "$OS_NAME" "$COMPILEFLAGS" "$LINKFLAGS"
 )
 
 # SQLite, just download and built by hand
@@ -109,7 +110,7 @@ fi
 (
 	cd sqlite3 || exit 1
 	cp "${CURDIR}"/scripts/compile_libs/make_lib_sqlite3.sh make_lib_sqlite3.sh
-	./make_lib_sqlite3.sh "$_ANDROID_ABI_LEVEL" "$OS_NAME" "$COMPILEFLAGS" "$LINKFLAGS"
+	./make_lib_sqlite3.sh "$ANDROID_API_LEVEL" "$OS_NAME" "$COMPILEFLAGS" "$LINKFLAGS"
 )
 
 cd ..