gRPC + Webrtc (chromium) = boringssl multiple definitions

[kristoffer...@gmail.com]

Hello!

I'm trying to compile an application linked against webrtc and grpc, both of which use their own builtin boringssl implementation. Thus I get a multiple definitions error when linking.

Is there a way around this? Am I doing something wrong?

aarch64-linux-gnu-g++ webrtc.pb.o webrtc.grpc.pb.o main.o grpc.o webrtc.o -L./lib/grpc -L./lib/protobuf -L./lib/webrtc -L./lib/webrtc/required -lprotobuf -pthread -lpthread -lgrpc++ -lgrpc -Wl,--no-as-needed -lgrpc++_reflection -Wl,--as-needed -ldl -lwebrtc -lpulse -lX11 -lv4l2 -o webrtc-linux

./lib/webrtc/libwebrtc.a(ssl_x509.o): In function `d2i_SSL_SESSION':

ssl_x509.c:(.text.d2i_SSL_SESSION+0x0): multiple definition of `d2i_SSL_SESSION'

./lib/grpc/libgrpc.a(ssl_asn1.o):/root/grpc_aarch64/third_party/boringssl/ssl/ssl_asn1.c:728: first defined here

./lib/webrtc/libwebrtc.a(ssl_x509.o): In function `SSL_get_peer_certificate':

ssl_x509.c:(.text.SSL_get_peer_certificate+0x0): multiple definition of `SSL_get_peer_certificate'

./lib/grpc/libgrpc.a(ssl_lib.o):/root/grpc_aarch64/third_party/boringssl/ssl/ssl_lib.c:1044: first defined here

(...)

[Nicolas Noble]

You can disable building boringssl by specifying EMBED_OPENSSL=false, but you'll need to provide headers for it. 

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[kristoffer...@gmail.com]

Thanks Nicolas

I looked around and it seems boringssl is only included because it doesn't find an alternative. And I guess I would have to find a way of mixing them if I needed SSL. But since I'm only using grpc in insecure mode I figured out I could use the static libraries that are "unsecure" versions of grpc, bypassing my entire problem.

torsdag 27. juli 2017 09.12.30 UTC+2 skrev Nicolas Noble følgende:

You can disable building boringssl by specifying EMBED_OPENSSL=false, but you'll need to provide headers for it. 

On Jul 26, 2017 09:30, <kristoffer...@gmail.com> wrote:

Hello!

I'm trying to compile an application linked against webrtc and grpc, both of which use their own builtin boringssl implementation. Thus I get a multiple definitions error when linking.

Is there a way around this? Am I doing something wrong?

aarch64-linux-gnu-g++ webrtc.pb.o webrtc.grpc.pb.o main.o grpc.o webrtc.o -L./lib/grpc -L./lib/protobuf -L./lib/webrtc -L./lib/webrtc/required -lprotobuf -pthread -lpthread -lgrpc++ -lgrpc -Wl,--no-as-needed -lgrpc++_reflection -Wl,--as-needed -ldl -lwebrtc -lpulse -lX11 -lv4l2 -o webrtc-linux

./lib/webrtc/libwebrtc.a(ssl_x509.o): In function `d2i_SSL_SESSION':

ssl_x509.c:(.text.d2i_SSL_SESSION+0x0): multiple definition of `d2i_SSL_SESSION'

./lib/grpc/libgrpc.a(ssl_asn1.o):/root/grpc_aarch64/third_party/boringssl/ssl/ssl_asn1.c:728: first defined here

./lib/webrtc/libwebrtc.a(ssl_x509.o): In function `SSL_get_peer_certificate':

ssl_x509.c:(.text.SSL_get_peer_certificate+0x0): multiple definition of `SSL_get_peer_certificate'

./lib/grpc/libgrpc.a(ssl_lib.o):/root/grpc_aarch64/third_party/boringssl/ssl/ssl_lib.c:1044: first defined here

(...)

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[Nicolas Noble]

That works too :-)

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