Build failed while trying to build libcxxabi

[jakesays-old]

here's the output:

"/home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang++"

is not able to compile a simple test program.

It fails with the following output:

Change Dir: /home/jake/pax/flutter_embedded/build/libcxxabi-prefix/src/libcxxabi-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_f318f/fast"
/usr/bin/make -f CMakeFiles/cmTC_f318f.dir/build.make CMakeFiles/cmTC_f318f.dir/build
make[1]: Entering directory '/home/jake/pax/flutter_embedded/build/libcxxabi-prefix/src/libcxxabi-build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_f318f.dir/testCXXCompiler.cxx.o
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang++ --sysroot=/home/jake/pax/flutter_embedded/sdk/sysroot    --target=arm-linux-gnueabihf -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS --target=arm-linux-gnueabihf -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS    -o CMakeFiles/cmTC_f318f.dir/testCXXCompiler.cxx.o -c /home/jake/pax/flutter_embedded/build/libcxxabi-prefix/src/libcxxabi-build/CMakeFiles/CMakeTmp/testCXXCompiler.cxx
Linking CXX executable cmTC_f318f
/opt/cmake/bin/cmake -E cmake_link_script CMakeFiles/cmTC_f318f.dir/link.txt --verbose=1
/home/jake/pax/flutter_embedded/sdk/toolchain/bin/clang++ --sysroot=/home/jake/pax/flutter_embedded/sdk/sysroot   --target=arm-linux-gnueabihf -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS --target=arm-linux-gnueabihf -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS     CMakeFiles/cmTC_f318f.dir/testCXXCompiler.cxx.o  -o cmTC_f318f
/usr/bin/arm-linux-gnueabihf-ld: cannot find crt1.o: No such file or directory
/usr/bin/arm-linux-gnueabihf-ld: cannot find crti.o: No such file or directory
/usr/bin/arm-linux-gnueabihf-ld: cannot find crtbegin.o: No such file or directory
/usr/bin/arm-linux-gnueabihf-ld: cannot find -lstdc++
/usr/bin/arm-linux-gnueabihf-ld: cannot find -lm
/usr/bin/arm-linux-gnueabihf-ld: cannot find -lgcc_s
/usr/bin/arm-linux-gnueabihf-ld: cannot find -lgcc
/usr/bin/arm-linux-gnueabihf-ld: cannot find -lc
/usr/bin/arm-linux-gnueabihf-ld: cannot find -lgcc_s
/usr/bin/arm-linux-gnueabihf-ld: cannot find -lgcc
/usr/bin/arm-linux-gnueabihf-ld: cannot find crtend.o: No such file or directory
/usr/bin/arm-linux-gnueabihf-ld: cannot find crtn.o: No such file or directory
clang-8: error: linker command failed with exit code 1 (use -v to see invocation)
make[1]: *** [CMakeFiles/cmTC_f318f.dir/build.make:87: cmTC_f318f] Error 1
make[1]: Leaving directory '/home/jake/pax/flutter_embedded/build/libcxxabi-prefix/src/libcxxabi-build/CMakeFiles/CMakeTmp'
make: *** [Makefile:121: cmTC_f318f/fast] Error 2

[jwinarske]

Actually, I think I found your issue. I just built on a new machine without the sysroot present, and I get the same results as you. The fix was a matter of setting up the sysroot folder.

Raspberry Pi sysroot example

Download Raspbian Lite image from Raspbian Image Download Page. Extract the image, and you will have a .img file. If on Ubuntu Bionic, double click the img file. It will auto-mount the partitions present. You're interested in the rootfs partition. From terminal or nautilus, copy the /lib, /opt, and /usr directories from the rootfs mount. Copy these to the default sysroot folder - {flutter_embedded git clone root}/sdk/sysroot

It would look like this after clang and binutils built correctly:

./sdk
|-- sysroot
|   |-- lib
|   |-- opt
|   `-- usr
`-- toolchain
    |-- arm-linux-gnueabihf
    |-- bin
    |-- include
    |-- lib
    |-- libexec
    `-- share

You can optionally override the default sysroot location using a CMake variable.

[jakesays-old]

As a test I built with a sysroot and default settings and it worked. What I really need, though is arm-linux-gnueabi. I'm targeting a very old device (linux 3.0) with 64MB (yes that's an M. lol). Should be fun.

I'll try it again with the the proper target values set for armel.

[jwinarske]

Sounds like fun :)