GNU Arm Embedded Toolchain

g++ can't find lstdc++_s

Asked by nrh

I'd like to compile a hello world program in c++ before I start compiling real code, just so I know
I can use the toolchain correctly (I've been using it on C code for some time now).

When I run

arm-none-eabi-g++ hello.cpp -mthumb -mcpu=cortex-m0 -Os -ffunction-sections -fdata-sections -fno-exceptions --specs=nano.specs -Wl,--gc-sections -Wl,-Map=cpp.map -o cpp-CM0.axf -lc -lstdc++ -lc -lnosys

I get the following g++ output:

/home/nrhinnant/toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/build-native/target-libs/lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/bin/ld: cannot find -lstdc++_s
/home/nrhinnant/toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/build-native/target-libs/lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/bin/ld: cannot find -lc_s
/home/nrhinnant/toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/build-native/target-libs/lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/bin/ld: cannot find -lstdc++_s
/home/nrhinnant/toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/build-native/target-libs/lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/bin/ld: cannot find -lc_s
/home/nrhinnant/toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/build-native/target-libs/lib/gcc/arm-none-eabi/4.7.3/../../../../arm-none-eabi/bin/ld: cannot find -lc_s
collect2: error: ld returned 1 exit status

Do I need to pass a specific path to lstdc++_s? Is it a prebuilt library or do I need to enable it's creation when I build the toolchain? I'm cross-compiling onto the STM32F407VG.

Thank you very much for your time!

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chengbin (can-finner) said : 		#1

I don't understand it.
The exactly command line works for me with below hello.cc

#include <iostream>

int main(void)
{
  std::cout <"hello world" << std::endl;

  return 0;
}

Could you check directory TOOLCHAIN/arm-none-eabi/lib/armv6-m to see whether there are libraries like "libc_s.a/listdc++_s.a"?

Revision history for this message
nrh (nrh) said : 		#2

So I went to check the directory you specified, and my toolchain is structured differently than yours apparently.

I have:

toolchain/

toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313

toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/build-native
toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/install-native
toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/pkg
toolchain/gcc-arm-none-eabi-4_7-2013q1-20130313/src

So I can't really follow that path. I did a find on "libc_s.a" and "lstdc++_s.a" both of which came up with nothing. Seems strange, because the toolchain works fine for C programs...

Revision history for this message
nrh (nrh) said : 		#3

Ah, our toolchains are structured differently because you are using the pre-built binaries, and I'm building from source.
So, this opens a new line of questioning. I perhaps am not building the c++ libraries correctly?

Revision history for this message
chengbin (can-finner) said : 		#4

You can check the build dump to see whether there is any error.
The install-native is the resulting toolchain of your build, it can be renamed or moved to other places and used as well as the pre-built binary. You can also go into install-native to see whether there is the corresponding library mentioned.

Thanks.

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