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Hello,

The following test case disturbs system include path ordering of Android NDK r16:

cmake_minimum_required(VERSION 3.14 FATAL_ERROR)

project(testcase CXX)

file(WRITE testcase.cpp "#include <iostream>")
add_library(testcase STATIC testcase.cpp)

find_package(ZLIB REQUIRED)
target_link_libraries(testcase PRIVATE ZLIB::ZLIB)

Error:

/home/gregorj/Android/android-ndk-r16b/toolchains/llvm/prebuilt/linux-x86_64/bin/clang++ --target=aarch64-none-linux-android --gcc-toolchain=/home/gregorj/Android/android-ndk-r16b/toolchains/aarch64-linux-android-4.9/prebuilt/linux-x86_64 --sysroot=/home/gregorj/Android/android-ndk-r16b/sysroot   -isystem /home/gregorj/Android/android-ndk-r16b/sysroot/usr/include -isystem /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++/include -isystem /home/gregorj/Android/android-ndk-r16b/sources/android/support/include -isystem /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++abi/include -isystem /home/gregorj/Android/android-ndk-r16b/sysroot/usr/include/aarch64-linux-android -funwind-tables -no-canonical-prefixes -D__ANDROID_API__=21 -fexceptions -frtti -g -fPIC   -std=gnu++14 -MD -MT CMakeFiles/testcase.dir/testcase.cpp.o -MF CMakeFiles/testcase.dir/testcase.cpp.o.d -o CMakeFiles/testcase.dir/testcase.cpp.o -c ../testcase.cpp
In file included from ../testcase.cpp:1:
In file included from /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++/include/iostream:40:
In file included from /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++/include/istream:163:
In file included from /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++/include/ostream:140:
/home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++/include/locale:807:12: error: use of undeclared identifier 'strtof_l'
    return strtof_l(__a, __p2, _LIBCPP_GET_C_LOCALE);
           ^
/home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++/include/locale:813:12: error: use of undeclared identifier 'strtod_l'; did you mean 'strtold_l'?
    return strtod_l(__a, __p2, _LIBCPP_GET_C_LOCALE);
           ^
/home/gregorj/Android/android-ndk-r16b/sysroot/usr/include/stdlib.h:237:13: note: 'strtold_l' declared here
long double strtold_l(const char* __s, char** __end_ptr, locale_t __l) __INTRODUCED_IN(21);
            ^
2 errors generated.

Before adding zlib the order was:

-isystem /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++/include
-isystem /home/gregorj/Android/android-ndk-r16b/sources/android/support/include
-isystem /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++abi/include
-isystem /home/gregorj/Android/android-ndk-r16b/sysroot/usr/include
-isystem /home/gregorj/Android/android-ndk-r16b/sysroot/usr/include/aarch64-linux-android

After adding zlib the order is as follows:

-isystem /home/gregorj/Android/android-ndk-r16b/sysroot/usr/include
-isystem /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++/include 
-isystem /home/gregorj/Android/android-ndk-r16b/sources/android/support/include
-isystem /home/gregorj/Android/android-ndk-r16b/sources/cxx-stl/llvm-libc++abi/include
-isystem /home/gregorj/Android/android-ndk-r16b/sysroot/usr/include/aarch64-linux-android 

I guess zlib.h living in /home/gregorj/Android/android-ndk-r16b/sysroot/usr/include affects include order.

My CMake command line is: ~/src/cmake/_build/bin/cmake -DCMAKE_SYSTEM_NAME=Android -DCMAKE_ANDROID_NDK=/home/gregorj/Android/android-ndk-r16b -DCMAKE_ANDROID_ARCH_ABI=arm64-v8a -DCMAKE_SYSTEM_VERSION=21 -DCMAKE_ANDROID_STL_TYPE=c++_static -DCMAKE_ANDROID_NDK_TOOLCHAIN_VERSION=clang ..

Thanks, Gregor