On 10 January 2018 at 03:40, zhangwentao (M) <zhangwentao...@huawei.com> wrote:
> Hi, all
>
> I have updated my test case:
>
> Compile passed but failed while linking.
>
> wentao@ubuntu:~/test/lamda$ cat a.cc
> #include <iostream>
> using namespace std;
>
> int main()
> {
> auto f = [=]() {
> cout <<"Hello world"<<endl;
> };
> f();
> return 0;
> }
>
>
> wentao@ubuntu:~/test/lamda$ arm-eabi-g++ --std=gnu++11 a.cc -o arm32
> /home/wentao/TeeOS/tools/gcc-linaro-6.3.1-2017.05-x86_64_arm-eabi/bin/../lib/gcc/arm-eabi/6.3.1/../../../../arm-eabi/lib/libstdc++.a(locale.o):
> In function `get_locale_cache_mutex':
> /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/snapshots/gcc.git~linaro-6.3-2017.05/libstdc++-v3/src/c++98/locale.cc:36:
> undefined reference to `__sync_synchronize'
> /home/wentao/TeeOS/tools/gcc-linaro-6.3.1-2017.05-x86_64_arm-eabi/bin/../lib/gcc/arm-eabi/6.3.1/../../../../arm-eabi/lib/libstdc++.a(future.o):
> In function `__future_category_instance':
> /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/snapshots/gcc.git~linaro-6.3-2017.05/libstdc++-v3/src/c++11/future.cc:64:
> undefined reference to `__sync_synchronize'
> /home/wentao/TeeOS/tools/gcc-linaro-6.3.1-2017.05-x86_64_arm-eabi/bin/../lib/gcc/arm-eabi/6.3.1/../../../../arm-eabi/lib/libstdc++.a(locale_init.o):
> In function `(anonymous namespace)::get_locale_mutex()':
> /home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/snapshots/gcc.git~linaro-6.3-2017.05/libstdc++-v3/src/c++98/locale_init.cc:66:
> undefined reference to `__sync_synchronize'
> collect2: error: ld returned 1 exit status
> wentao@ubuntu:~/test/lamda$
>
Hi,
This error happens because the arm-eabi compiler defaults to an old
version of the architecture (v4 or v5t). Adding -mcpu=cortex-a9 for
instance should avoid the problem because the compiler will be able to
generate synchronization primitives inline.
Christophe
> 发件人: zhangwentao (M)
> 发送时间: 2018年1月10日 10:22
> 收件人: 'linaro-toolchain@lists.linaro.org'
> 抄送: Huangqiang (H); Lizefan; leijitang
> 主题: Does linaro toolchain support c++11 ??
>
> Hi all,
>
> I wonder if my compiler supports C++11? If not, where could I found the
> compiler supports c++11 (both 32bit and 64bit arm).
>
> THANKS a lot~~~
>
> My compiler information is as below:
>
> wentao@ubuntu:~/test/lamda$ arm-eabi-g++ -v
> Using built-in specs.
> COLLECT_GCC=arm-eabi-g++
> COLLECT_LTO_WRAPPER=/home/wentao/TeeOS/tools/gcc-linaro-6.3.1-2017.05-x86_64_arm-eabi/bin/../libexec/gcc/arm-eabi/6.3.1/lto-wrapper
> Target: arm-eabi
> Configured with:
> '/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/snapshots/gcc.git~linaro-6.3-2017.05/configure'
> SHELL=/bin/bash
> --with-mpc=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu
>
> --with-mpfr=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu
>
> --with-gmp=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu
> --with-gnu-as --with-gnu-ld --disable-libmudflap --enable-lto
> --enable-shared --without-included-gettext --enable-nls
> --disable-sjlj-exceptions --enable-gnu-unique-object --enable-linker-build-id
> --disable-libstdcxx-pch --enable-c99 --enable-clocale=gnu
> --enable-libstdcxx-debug --enable-long-long --with-cloog=no --with-ppl=no
> --with-isl=no --enable-multilib --with-multilib-list=aprofile
> --enable-threads=no --disable-multiarch --with-newlib
> --with-build-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/sysroots/arm-eabi
>
> --with-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu/arm-eabi/libc
> --enable-checking=release --disable-bootstrap --enable-languages=c,c++,lto
> --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu
> --target=arm-eabi
> --prefix=/home/tcwg-buildslave/workspace/tcwg-make-release/builder_arch/amd64/label/tcwg-x86_64-build/target/arm-eabi/_build/builds/destdir/x86_64-unknown-linux-gnu
> Thread model: single
> gcc version 6.3.1 20170404 (Linaro GCC 6.3-2017.05)
> wentao@ubuntu:~/test/lamda$
>
> ===>
> And more, I wrote a “hello-world” program using c++11, it could work with
> host g++, but when I change to “arm-eabi-g++”, it does not work.
> Information as below:
>
> wentao@ubuntu:~/test/lamda$ cat a.cc
> #include <iostream>
> using namespace std;
>
> typedef void(*Func)();
> int main()
> {
> Func f = [=]() {
> cout <<"Hello world"<<endl;
> };
> f();
> return 0;
> }
> wentao@ubuntu:~/test/lamda$ g++ a.cc -o host
> a.cc: In function ‘int main()’:
> a.cc:10:2: warning: lambda expressions only available with -std=c++11 or
> -std=gnu++11 [enabled by default]
> };
> ^
> wentao@ubuntu:~/test/lamda$ ./host
> Hello world
> wentao@ubuntu:~/test/lamda$ arm-eabi-g++ a.cc -o arm32
> a.cc: In function ‘int main()’:
> a.cc:10:2: error: cannot convert ‘main()::<lambda()>’ to ‘Func {aka void
> (*)()}’ in initialization
> };
> ^
> wentao@ubuntu:~/test/lamda$ arm-eabi-g++ --std=gnu++11 a.cc -o arm32 #
> if gives –std=c++11 , the error is the same.
> a.cc: In function ‘int main()’:
> a.cc:10:2: error: cannot convert ‘main()::<lambda()>’ to ‘Func {aka void
> (*)()}’ in initialization
> };
> ^
> wentao@ubuntu:~/test/lamda$
>
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