[question] Proper Android NDK Usage

[cjserio]

What is your question?

Hi all,

In light of this thread I've configured my Android profile as follows:

[settings]
arch=armv8
os=Android
os.api_level=24
compiler=clang
compiler.version=14
compiler.libcxx=c++_static
compiler.cppstd=20

[tool_requires]
android-ndk/r25c

This seems to work for packages such as boost however I cannot get freetype/2.13.2 to compile because using the android-ndk as a tool causes Conan to populate its conanbuildenv-release-armv8.sh file with a line like this:

export SYSROOT="/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot"

It seems that meson sees that line and then creates a conan_meson_cross.ini file that contains these snippets:

[properties]
needs_exe_wrapper = true
sys_root = '/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot'

# C/C++ arguments
c_args = ['--sysroot=/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot'] + preprocessor_definitions
c_link_args = ['--sysroot=/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot']
cpp_args = ['--sysroot=/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot'] + preprocessor_definitions
cpp_link_args = ['--sysroot=/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot']

And then when it comes time to actually compile I get this output:

[9/46] Compiling C object libfreetype.a.p/src_sfnt_sfnt.c.o
FAILED: libfreetype.a.p/src_sfnt_sfnt.c.o
/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/bin/aarch64-linux-android24-clang -Ilibfreetype.a.p -I. -I../src -I../src/include -I/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/Users/cjserio/.conan2/p/zlibb1e8c6365dfaa/p/include -I/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/Users/cjserio/.conan2/p/bzip2d3df4e2c5adee/p/include -I/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/Users/cjserio/.conan2/p/b/libpn4cc933203066c/p/include -I/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/Users/cjserio/.conan2/p/brotlf2a109645ecdb/p/include -I/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot/Users/cjserio/.conan2/p/brotlf2a109645ecdb/p/include/brotli -fvisibility=hidden -fdiagnostics-color=always -DNDEBUG -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -O3 --sysroot=/Users/cjserio/.conan2/p/andro355698625527f/p/bin/toolchains/llvm/prebuilt/darwin-x86_64/sysroot -fPIC '-DFT_CONFIG_MODULES_H=<ftmodule.h>' -DFT2_BUILD_LIBRARY=1 '-DFT_CONFIG_OPTIONS_H=<ftoption.h>' '-DFT_CONFIG_CONFIG_H=<ftconfig.h>' -MD -MQ libfreetype.a.p/src_sfnt_sfnt.c.o -MF libfreetype.a.p/src_sfnt_sfnt.c.o.d -o libfreetype.a.p/src_sfnt_sfnt.c.o -c ../src/src/sfnt/sfnt.c
In file included from ../src/src/sfnt/sfnt.c:21:
../src/src/sfnt/pngshim.c:31:10: fatal error: 'png.h' file not found
#include <png.h>
         ^~~~~~~
1 error generated.
[18/46] Compiling C object libfreetype.a.p/src_truetype_truetype.c.o
ninja: build stopped: subcommand failed.

freetype/2.13.2: ERROR:
Package '66b8f533f7934c9cd1bfa22db0fd2e5729766db1' build failed
freetype/2.13.2: WARN: Build folder /Users/cjserio/.conan2/p/b/freetc81a098733940/b/build-release
ERROR: freetype/2.13.2: Error in build() method, line 113
	meson.build()
	ConanException: Error 1 while executing

As you can see, it can't find png.h because the include path for png.h has the sys_root stuck in front of it. So I'm just not sure if this is a Conan bug, a meson bug, a bug in freetype's recipe or if my Android profile is not setup correctly. Any help would be appreciated.

/cc @uilianries @neobrain

[AbrilRBS]

/cc @perseoGI @uilianries which have been looking into this recently :)