Building Chromium, WebRTC without LTO

Question

I'm on Arch Linux x86_64, attempting to build the WebRTC libraries. I get compile errors when I do:

[ghilliard@diadem trunk]$ ninja -C out/Release peerconnection_server
ninja: Entering directory `out/Release'
[1/1] LINK peerconnection_server
FAILED: c++ -Wl,-z,now -Wl,-z,relro -Wl,--fatal-warnings -pthread -Wl,-z,noexecstack -fPIC -B/home/ghilliard/Code/webrtc-attempt2/trunk/third_party/binutils/Linux_x64/Release/bin -Wl,--disable-new-dtags -m64 -Wl,--icf=none -fuse-ld=gold -Wl,-O1 -Wl,--as-needed -Wl,--gc-sections -o peerconnection_server -Wl,--start-group obj/talk/examples/peerconnection/server/peerconnection_server.data_socket.o obj/talk/examples/peerconnection/server/peerconnection_server.main.o obj/talk/examples/peerconnection/server/peerconnection_server.peer_channel.o obj/talk/examples/peerconnection/server/peerconnection_server.utils.o obj/talk/libjingle.a obj/net/third_party/nss/libcrssl.a obj/third_party/jsoncpp/libjsoncpp.a  -Wl,--end-group -lsmime3 -lnss3 -lnssutil3 -lplds4 -lplc4 -lnspr4 -ldl -lcrypto -lrt -lXext -lX11 -lXcomposite -lXrender -lexpat
/home/ghilliard/Code/webrtc-attempt2/trunk/third_party/binutils/Linux_x64/Release/bin/ld.gold: -plugin: unknown option
/home/ghilliard/Code/webrtc-attempt2/trunk/third_party/binutils/Linux_x64/Release/bin/ld.gold: use the --help option for usage information
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

There appears to be a problem with link time optimization. However, I cannot figure out how to build WebRTC without LTO enabled. If I manually run the command that failed and append -fno-lto, it links fine. How can I add or change the compiler/linker flags within the gyp configuration so that it gets applied to everything?

Answer 1

ninja does not respect environment variables, but gyp does.

So after setting the LDFAGS environment variables, you have to run gyp_chromium to let the gyp generate correct ninja build file.

export LDFLAGS='-fno-lto' build/gyp_chromium ninja -C out/Release peerconnection_server

Answer 2

You might try to set compiler/linker flags in environment variables before build:

export CFLAGS="${CFLAGS} -fno-lto"
export CXXFLAGS="${CXXFLAGS} -fno-lto"
export LDFLAGS="${LDFLAGS} -fno-lto"
ninja -C out/Release