Forums - unrecognised emulation mode: armelf_linux_eabi

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unrecognised emulation mode: armelf_linux_eabi
huchen_1987
Join Date: 18 Oct 19
Posts: 2
Posted: Mon, 2020-02-10 18:35
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Hi, all

I want to build a simple C code like "Hello World" and run it on the Snapdagon 855 Android.

I folowed the instructions of the LLVM

https://developer.qualcomm.com/download/sdllvm/readme-snapdragon-llvm.pdf

I have android-ndk-r17 with the Snapdragon LLVM ARM Compiler 6.0.2 for Android NDK  installed in it.

The detail is:

Windows (64-bit) ;

Cygwin-x86_64;      which path is: C:\cygwin64

android-ndk-r17;       which path is:C:\android-ndk-r17

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My main issue is the how to compile and link. My command  is:

/cygdrive/c/android-ndk-r17/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe -nostdlib -march=armv7-a -mcpu=cortex-a8 -marm --target=arm-linux-androideabi -gcc-toolchain C:\\android-ndk-r17\\toolchains\\arm-linux-androideabi-4.9\\prebuilt\\linux-x86_64 --sysroot=C:\\android-ndk-r17\\sysroot\\usr\\lib hello.c -o hello.exe -I C:\\android-ndk-r17\\sysroot\\usr\\include -I C:\\android-ndk-r17\\sources\\cxx-stl\\llvm-libc++\\include -I C:\\android-ndk-r17\\sysroot\\usr\\include\\arm-linux-androideabi -v -lc

Then I got errors:

/usr/bin/ld: unrecognised emulation mode: armelf_linux_eabi 

Supported emulations: i386pep i386pe

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I tried command below which is only added by "-fuse-ld=qcld":

/cygdrive/c/android-ndk-r17/toolchains/llvm/prebuilt/windows-x86_64/bin/clang.exe ... -v -fuse-ld=qcld -lc

 

Then I got errors:

Fatal: cannot recognize namespec -lc
clang.exe: error: linker command failed with exit code 1 (use -v to see invocation)
 
 
 

I think there is someting error about linker, can anyone give me some help, thanks a lot!!!!

 

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Re: unrecognised emulation mode: armelf_linux_eabi
huchen_1987
Join Date: 18 Oct 19
Posts: 2
Posted: Mon, 2020-02-10 23:00
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someone said the output is coming from /usr/bin/ld, which is the system ld, rather than the ld included with the NDK. I don't know why this ld  is being executed instead, can anyone give me some help, thanks a lot!
 
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I tried command " ld -v" in Cygwin, Then I got:
 
GNU ld (GNU Binutils) 2.29.1.20171006
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I tried command below:
C:\android-ndk-r17\toolchains\aarch64-linux-android-4.9\prebuilt\windows-x86_64\aarch64-linux-android\bin\ld.exe -v
 
Then I got:
GNU ld (binutils-2.27-bf0c2e88) 2.27.0.20170315
------------------------------------------------------------

 

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