CODEWITHSUNDEEP
c++linker-errorsscons
rkemp
rkemp

Reputation: 278

scons linker error for system libs

I re-organized the directory tree of an existing project, making relevant Sconscript changes, and in so-doing I introduced the following linker error:

/bin/ld: note: '__cxa_free_exception@@CXXABI_1.3' is defined in DSO /usr/lib64/libstdc++.so.6 so try adding it to the linker command line /usr/lib64/libstdc++.so.6: could not read symbols: Invalid operation collect2: error: ld returned 1 exit status

I found this thread and if I follow that advice and attempt to be explicit about the system libs it just kicks the can down the road (the ensuing error will be about libm and so on with other system libs).

Since this compiles fine without my reorganization, what could have been done to scons where it no longer links to system libs?

Nowhere in the existing SConstruct/Sconscript fileset is there any reference to linking against any of the system libs. This was automagically done by scons, but now that I have rearranged a few subprojects, I encounter the above error.

The libpath and rpath both include the following: '/usr/lib64', '/usr/lib64/mysql', '/usr/local/lib',

Linker Command

gcc -o build/debug/icln/src/foo/fooCert/build/scons/fooCertFromFiles -Wl,-rpath=/usr/lib64 -Wl,-rpath=/usr/lib64/mysql -Wl,-rpath=/usr/local/lib -Wl,-rpath=/ws/build/debug/icmn/src/common -Wl,-rpath=../../../../engine/build/scons -Wl,-rpath=../../../../foo/build/scons -Wl,-rpath=../../../../kb/build/scons -Wl,-rpath=../../../../bar/build/scons -Wl,-rpath=../../../../tables/build/scons -Wl,-rpath=../../../../utils/build/scons -L/usr/lib64 -L/usr/lib64/mysql -L/usr/local/lib -Lbuild/debug/icmn/src/common -L/ws/icmn/src/common -Lbuild/debug/icln/src/engine/build/scons -Lsrc/engine/build/scons -Lbuild/debug/icln/src/foo/build/scons -Lsrc/foo/build/scons -Lbuild/debug/icln/src/kb/build/scons -Lsrc/kb/build/scons -Lbuild/debug/icln/src/bar/build/scons -Lsrc/bar/build/scons -Lbuild/debug/icln/src/tables/build/scons -Lsrc/tables/build/scons -Lbuild/debug/icln/src/utils/build/scons -Lsrc/utils/build/scons -lcengine -lbar -lfoo -lkb -lcutils -lCommon -ltables -lglog -lboost_date_time -lboost_serialization -lboost_system -lboost_filesystem -lmongoclient -lboost_thread -lpthread -lmysqlcppconn -lmysqlclient

Update: I noticed the call to build the final binary was to gcc, and not g++. I am still trying to determine why it suddenly switched to gcc instead of g++, but I think this is heading towards root cause.

How does scons determine whether to invoke CC vs CXX?

Upvotes: 1

Views: 817

Answers (1)

rkemp
rkemp

Reputation: 278

Solved: So because of the re-organization I performed, a call to Glob() was resolving to an empty list since I had changed the path to where the source files are.

The fix: I needed to update the Glob call to use new path to the source (the Sconscript and source files no longer co-reside in the same directory as they did before).

BEFORE

source = Glob('*.cc')

AFTER

source = Glob('../../src/*.cc')

Upvotes: 0

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