building nodejs from source partially used export CC, ...

[janemba]

Hello,

I have two gcc versions installed. However, I'm building node 8.15.1 with gcc-5. To achieve this, I'm using environment variables with CC,CXX,AR,... It works but at some point environment variables are not used. I noticed it when building process is using mksnapshot.

below failed make step:

  g++-5 '-DV8_GYP_BUILD' '-DV8_TARGET_ARCH_X64' '-DENABLE_DISASSEMBLER' '-DV8_PROMISE_INTERNAL_FIELD_COUNT' '-Dv8_promise_internal_field_count' '-DV8_INTL_SUPPORT' '-DUCONFIG_NO_SERVICE=1' '-DUCONFIG_NO_REGULAR_EXPRESSIONS=1' '-DU_ENABLE_DYLOAD=0' '-DU_STATIC_IMPLEMENTATION=1' '-DU_HAVE_STD_STRING=0' '-DUCONFIG_NO_BREAK_ITERATION=0' -I../deps/v8 -I../. -I../deps/v8/include -I../deps/icu-small/source/i18n -I../deps/icu-small/source/common  -pthread -Wall -Wextra -Wno-unused-parameter -m64 -fno-strict-aliasing -m64 -fdata-sections -ffunction-sections -O3 -O3 -fno-omit-frame-pointer -fno-rtti -fno-exceptions -std=gnu++0x -MMD -MF /tmp/node-v8.15.1/out/Release/.deps//tmp/node-v8.15.1/out/Release/obj.target/mksnapshot/deps/v8/src/snapshot/mksnapshot.o.d.raw  -O2 -fPIC -c -o /tmp/node-v8.15.1/out/Release/obj.target/mksnapshot/deps/v8/src/snapshot/mksnapshot.o ../deps/v8/src/snapshot/mksnapshot.cc
  g++-5 -pthread -rdynamic -m64 -m64  -o /tmp/node-v8.15.1/out/Release/mksnapshot -Wl,--start-group /tmp/node-v8.15.1/out/Release/obj.target/mksnapshot/deps/v8/src/snapshot/mksnapshot.o /tmp/node-v8.15.1/out/Release/obj.target/deps/v8/src/libv8_base.a /tmp/node-v8.15.1/out/Release/obj.target/deps/v8/src/libv8_builtins_setup.a /tmp/node-v8.15.1/out/Release/obj.target/deps/v8/src/libv8_libbase.a /tmp/node-v8.15.1/out/Release/obj.target/deps/v8/src/libv8_libplatform.a /tmp/node-v8.15.1/out/Release/obj.target/deps/v8/src/libv8_nosnapshot.a /tmp/node-v8.15.1/out/Release/obj.target/tools/icu/libicui18n.a /tmp/node-v8.15.1/out/Release/obj.target/deps/v8/src/libv8_libsampler.a /tmp/node-v8.15.1/out/Release/obj.target/tools/icu/libicuucx.a /tmp/node-v8.15.1/out/Release/obj.target/tools/icu/libicudata.a /tmp/node-v8.15.1/out/Release/obj.target/tools/icu/libicustubdata.a /tmp/node-v8.15.1/out/Release/obj.target/deps/v8/src/libv8_builtins_generators.a -lz -lcrypto -lssl -ldl -lrt -Wl,--end-group
  LD_LIBRARY_PATH=/tmp/node-v8.15.1/out/Release/lib.host:/tmp/node-v8.15.1/out/Release/lib.target:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; cd ../deps/v8/src; mkdir -p /tmp/node-v8.15.1/out/Release/obj.target/v8_snapshot/geni; "/tmp/node-v8.15.1/out/Release/mksnapshot" --startup_src "/tmp/node-v8.15.1/out/Release/obj.target/v8_snapshot/geni/snapshot.cc" ""
/tmp/node-v8.15.1/out/Release/mksnapshot: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by /tmp/node-v8.15.1/out/Release/mksnapshot)
make[1]: *** [/tmp/node-v8.15.1/out/Release/obj.target/v8_snapshot/geni/snapshot.cc] Error 1
rm 98682b60ad7e40c6592e0a7d2cd9f4fab62dbc00.intermediate
make[1]: Leaving directory `/tmp/node-v8.15.1/out'
make: *** [node] Error 2

So it seems, mksnapshot is not built using the gcc version I set with export.

[refack]

I believe it's more subtle.

g++-5 -pthread -rdynamic -m64 -m64 -o /tmp/node-v8.15.1/out/Release/mksnapshot

This line would indicate mksnapshot is being linked using g++-5.

/tmp/node-v8.15.1/out/Release/mksnapshot: /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.20' not found (required by /tmp/node-v8.15.1/out/Release/mksnapshot)

This would also indicate it was built by GCC >= 4.9.
But the runtime loader can't find the right libstdc++.so.6 version. Try locate libstdc++.so.6 to search for the version ones. For example:

# locate libstdc++.so.6
/data/gcc-4.9/lib64/libstdc++.so.6
/data/gcc-4.9/lib64/libstdc++.so.6.0.20
/usr/lib/libstdc++.so.6
/usr/lib/libstdc++.so.6.0.19
/usr/lib64/libstdc++.so.6
/usr/lib64/libstdc++.so.6.0.19

We are currently investigating the optimal way to solve this, but so your case I can suggest three options:

1. configure the node build with ./configure --partly-static. That will statically link libstdc++ into binaries
2. find the latest libstdc++.so.6 on your system, and symlink it to /usr/lib/libstdc++.so.6
3. set LD_LIBRARY_PATH to where the newer lib is

[janemba]

@refack

I used the second options and it works. Thank you.

[refack]

Happy to help 🎩