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clang doesn't autodetect C++ headers
bo.lind.fingerprints
Join Date: 3 Nov 16
Posts: 2
Posted: Tue, 2016-11-08 01:58
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A normal, vanilla clang autodetects existing headers from GCC collections. If invoked with the -v option, the output is:

...

Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/4.9.4
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/5.4.1
...
But the Snapdragon LLVM does not. Where are C++ headers intended to come from? They aren't provided as part of the Snapdragon LLVM, and it doesn't find them.
 
Thanks in advance.
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Re: clang doesn't autodetect C++ headers
bo.lind.fingerprints
Join Date: 3 Nov 16
Posts: 2
Posted: Tue, 2016-11-08 02:38
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Ah, if one actually reads the docs, the answer lies in the make-standalone-toolchain-snapdragon-llvm.sh script:

 

For ARMv7:
 
If using Android NDK r11b:
<NDK_ROOT>/build/tools/make-standalone-toolchain-snapdragon-llvm.sh \
--ndk-dir=<NDK_ROOT> --platform=android-19 --arch=arm \
--install-dir=<some_dir> --use-llvm --system=linux-x86_64
 
If using Android NDK r10e:
<NDK_ROOT>/build/tools/make-standalone-toolchain.sh --ndk-dir=<NDK_ROOT> \
--platform=android-19 --arch=arm --install-dir=<some_dir> \
--toolchain=arm-linux-androideabi-4.9 \
--llvm-version=Snapdragon_LLVM_for_Android_3.8 --system=linux-x86_64
 
The above command lines specify that android-19 platform directory must be
copied to be used as the standalone sysroot and GCC-4.9 toolchain must be
copied to be used as the linker and for other binutils such as objdump.
 
For AArch64:
 
If using Android NDK r11b:
<NDK_ROOT>/build/tools/make-standalone-toolchain-snapdragon-llvm.sh \
--ndk-dir=<NDK_ROOT> --platform=android-21 --arch=arm64 \
--install-dir=<some_dir> --use-llvm --system=linux-x86_64
 
If using Android NDK r10e:
<NDK_ROOT>/build/tools/make-standalone-toolchain.sh --ndk-dir=<NDK_ROOT> \
--platform=android-21 --arch=arm64 --install-dir=<some_dir> \
--toolchain=aarch64-linux-android-4.9 \
--llvm-version=Snapdragon_LLVM_for_Android_3.8 --system=linux-x86_64
 
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