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/usr/share/doc/gcc-4.8-base/C++/README.libstdc++-baseline.amd64 is in libstdc++-4.8-dev 4.8.4-1.

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The actual contents of the file can be viewed below.

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The libstdc++ baseline file is a list of symbols exported by the
libstdc++ library.
A baseline file for x86_64-linux-gnu was found.
Running the check-abi script ...

make[2]: Entering directory '/scratch/packages/gcc/4.8/gcc-4.8-4.8.4/build/x86_64-linux-gnu/libstdc++-v3/testsuite'
Test Run By doko on Fri Dec 19 22:27:53 2014
Native configuration is x86_64-pc-linux-gnu

		=== libstdc++ tests ===

Schedule of variations:
    unix

Running target unix
Using /usr/share/dejagnu/baseboards/unix.exp as board description file for target.
Using /usr/share/dejagnu/config/unix.exp as generic interface file for target.
Using ../../../../src/libstdc++-v3/testsuite/config/default.exp as tool-and-target-specific interface file.
Running ../../../../src/libstdc++-v3/testsuite/libstdc++-abi/abi.exp ...

		=== libstdc++ Summary ===

# of expected passes		1
make[2]: Leaving directory '/scratch/packages/gcc/4.8/gcc-4.8-4.8.4/build/x86_64-linux-gnu/libstdc++-v3/testsuite'