Android 9 (P)版本解決VNDK library: XXX‘s ABI has EXTENDING CHANGES（轉載）
阿新 • • 發佈：2020-10-10
https://blog.csdn.net/tkwxty/article/details/105834911
一.問題現象
當我們嘗試對Android原始碼下面的system/core/liblog原始碼目錄下面的檔案新增一些介面時，適配問題出現了，編譯一直報錯，如下所示：
QSSI: not enabled for msm8953_64 target as vendor/qcom/proprietary/release/QSSI/QSSI_enforced_targets_list.txt was not found.
ninja: no work to do.
ninja: no work to do.
No need to regenerate ninja file
No need to regenerate ninja file
[ 50% 1/2] glob .
[ 16% 1/6] //system/core/liblog:liblog header-abi-diff liblog.so.abidiff
FAILED: out/soong/.intermediates/system/core/liblog/liblog/android_arm64_armv8-a_core_shared/liblog.so.abidiff
(prebuilts/clang-tools/linux-x86/bin/header-abi-diff -allow-unreferenced-changes -allow-unreferenced-elf-symbol-changes -lib liblog -arch arm64 -o out/soong/.intermediates/system/core/liblog/liblog/android_arm64_armv8-a_core_shared/liblog.so.abidiff -new out/soong/.intermediates/system/core/liblog/liblog/android_arm64_armv8-a_core_shared/liblog.so.lsdump -old out/soong/.intermediates/system/core/liblog/liblog/android_arm64_armv8-a_core_shared/liblog.so_ref.lsdump)|| (echo ' ---- Please update abi references by running platform/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l liblog ----' && exit 1)
******************************************************
error: VNDK library: liblog's ABI has EXTENDING CHANGES Please check compatiblity report at : out/soong/.intermediates/system/core/liblog/liblog/android_arm64_armv8-a_core_shared/liblog.so.abidiff
******************************************************
---- Please update abi references by running platform/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l liblog ----
ninja: build stopped: subcommand failed.
不用懷疑，這個不是你原始碼的問題。這個是由於Android P增加了VNDK的限制。
二.VNDK是什麼
VNDK(Vendor Native Development Kit)是一組專門用於vendor實現其HAL的lib庫，因為自Android 8.0以來，Google引入了Treble架構，希望對vendor和system分割槽進行解耦處理，期待實現：framwork程序不載入vendor共享庫，vendor程序僅載入vendor共享庫（和部分framework共享庫），而framework程序和vendor程序之間通過HIDL和hwbinder來通訊。總結為如下幾點：
- platform和Vendor的構建是相互隔離的；
- platform lib對應 system.img；
- vendor lib對應 vendor.img；
- 大多數情況下，Vendor lib跟系統核心不能相互使用；Vendor lib不允許dlopen私有的系統庫；
- 合作伙伴不允許為自己的產品在VNDK新增lib，只能貢獻到AOSP；
關於VNDK的具體介紹可以參見如下部落格：
ABI 穩定性
Android : 供應商原生開發套件 (VNDK)
供應商原生開發套件 (VNDK)
三.怎麼解決
在程式碼中搜索，發現 development/vndk/tools/header-checker/header-abi-diff/src 中的 header_abi_diff.cpp 報出的錯誤。錯誤提示如下：
184 if (should_emit_warning_message) {
185 llvm::errs() << "******************************************************\n"
186 << error_or_warning_str
187 << "VNDK library: "
188 << lib_name
189 << "'s ABI has "
190 << status_str
191 << unreferenced_change_str
192 << " Please check compatiblity report at : "
193 << compatibility_report << "\n"
194 << "******************************************************\n";
195 }
於是，直接修改程式碼，讓裡面的 main 直接返回 abi_util::CompatibilityStatusIR::Compatible; 然後重新編譯這個檔案，覆蓋到程式碼中的檢查庫。全編譯。通過！！
下面讓我們詳細講解一下步驟：
- 修改development/vndk/tools/header-checker/header-abi-diff/src/header_abi_diff.cpp，改動如下：
--- a/development/vndk/tools/header-checker/header-abi-diff/src/header_abi_diff.cpp
+++ b/development/vndk/tools/header-checker/header-abi-diff/src/header_abi_diff.cpp
@@ -182,21 +182,21 @@ int main(int argc, const char **argv) {
bool should_emit_warning_message = ShouldEmitWarningMessage(status);
if (should_emit_warning_message) {
- llvm::errs() << "******************************************************\n"
- << error_or_warning_str
- << "VNDK library: "
- << lib_name
- << "'s ABI has "
- << status_str
- << unreferenced_change_str
- << " Please check compatiblity report at : "
- << compatibility_report << "\n"
- << "******************************************************\n";
+// llvm::errs() << "******************************************************\n"
+// << error_or_warning_str
+// << "VNDK library: "
+// << lib_name
+// << "'s ABI has "
+// << status_str
+// << unreferenced_change_str
+// << " Please check compatiblity report at : "
+// << compatibility_report << "\n"
+// << "******************************************************\n";
}
- if (!advice_only && should_emit_warning_message) {
- return status;
- }
- 重新編譯 development/vndk/tools/header-checker，編譯命令如下:
mmm development/vndk/tools/header-checker/ -j32
616+0 records in
616+0 records out
630784 bytes (631 kB, 616 KiB) copied, 0.0032836 s, 192 MB/s
[ 66% 2/3] glob .
[100% 5/5] Install: out/host/linux-x86/bin/header-abi-diff
- 複製 out/host/linux-x86/bin/header-abi-diff 到 prebuilts/clang-tools/linux-x86/bin 中覆蓋，命令如下：
cp out/host/linux-x86/bin/header-abi-diff prebuilts/clang-tools/linux-x86/bin/header-abi-diff
- 重新souurce lunhcer，再執行你需要修改的so檔案，譬如我們這裡的是liblog，我們編譯一把:
make -j32 liblog
//編譯結果
vendor/qcom/build/tasks/generate_extra_images.mk:558: warning: overriding commands for target `kernelclean'
device/qcom/common/generate_extra_images.mk:558: warning: ignoring old commands for target `kernelclean'
[100% 76/76] build out/host/linux-x86/obj32/SHARED_LIBRARIES/liblog_intermediates/liblog.so.toc
好了,大功告成可以愉快的修改VNDK的相關改動了。