error: undefined symbol: std::__1::basic_string when building shared library

[ar...@drive.ai]

Hi, 
I am building a dead simple shared library using GN, and I am getting this error because I don't have the standard library in my dependency tree.

I would like to know what deps I should add to have the standard library but not boringssl? (I want to build a shared library that will depends on the real openssl library).

root@8790fc1eb791:/webrtc/src/out/Default# ninja -C . libsig

ninja: Entering directory `.'

[1/1] Regenerating ninja files

[2/2] SOLINK ./libsig.so

FAILED: libsig.so libsig.so.TOC

python "../../build/toolchain/gcc_solink_wrapper.py" --readelf="readelf" --nm="nm" --sofile="./libsig.so" --tocfile="./libsig.so.TOC" --output="./libsig.so"  -- ../../third_party/llvm-build/Release+Asserts/bin/clang++ -shared -fPIC -Wl,-z,noexecstack -Wl,-z,now -Wl,-z,relro -Wl,-z,defs -Wl,--no-as-needed -lpthread -Wl,--as-needed -fuse-ld=lld -Wl,--icf=all -m64 -Werror -Wl,--gdb-index -Wl,--fatal-warnings -nostdlib++ --sysroot=../../build/linux/debian_stretch_amd64-sysroot -L../../build/linux/debian_stretch_amd64-sysroot/lib/x86_64-linux-gnu -Wl,-rpath-link=../../build/linux/debian_stretch_amd64-sysroot/lib/x86_64-linux-gnu -L../../build/linux/debian_stretch_amd64-sysroot/usr/lib/x86_64-linux-gnu -Wl,-rpath-link=../../build/linux/debian_stretch_amd64-sysroot/usr/lib/x86_64-linux-gnu -o "./libsig.so" -Wl,-soname="libsig.so" @"./libsig.so.rsp"

/webrtc/src/out/Default/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: undefined symbol: std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::__init(char const*, unsigned long)

>>> referenced by string:1571 (../../buildtools/third_party/libc++/trunk/include/string:1571)

>>>               obj/examples/libsig/signaling.o:(driveai::signaling::Signaling::SignIn())

/webrtc/src/out/Default/../../third_party/llvm-build/Release+Asserts/bin/ld.lld: error: undefined symbol: std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >::~basic_string()

>>> referenced by signaling.cc:12 (../../examples/peerconnection/client/signaling/signaling.cc:12)

>>>               obj/examples/libsig/signaling.o:(driveai::signaling::Signaling::SignIn())

clang: error: linker command failed with exit code 1 (use -v to see invocation)

ninja: build stopped: subcommand failed.

root@8790fc1eb791:/webrtc/src/out/Default#

My GN file is (examples/BUILD.gn) from the webrtc tree:

  rtc_shared_library("libsig") {

    

    sources = [

      "peerconnection/client/signaling/signaling.cc"

    ]

    libs = [

      "/usr/lib/x86_64-linux-gnu/libssl.a"

    ]

  }

It get the same error if I replace "rtc_shared_library" by "shared_library".

It goes away if I depends on :

        deps = [

      "../rtc_base:rtc_base",

    ]

Thanks.

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[Aric Lasry]

fixed it :

        deps = [

      "//buildtools/third_party/libc++:libc++",

    ]

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