[PATCH, libstdc++]: Avoid -Wcast-qual warnings in src/c++98/compatibility.cc

[Uros Bizjak <ubizjak at gmail dot com>]

Hello!

Attached patch avoids a bunch of -Wcast-qual warnings when building
libstdc++ on alpha-linux-gnu, a _GLIBCXX_LONG_DOUBLE_COMPAT target:

../../../../gcc-svn/trunk/libstdc++-v3/src/c++98/compatibility.cc:521:16:
warning: cast from type ‘const char*’ to type ‘void*’ casts away
qualifiers [-Wcast-qual]
       (void *) _ZTSe };
                ^
../../../../gcc-svn/trunk/libstdc++-v3/src/c++98/compatibility.cc:524:16:
warning: cast from type ‘const char*’ to type ‘void*’ casts away
qualifiers [-Wcast-qual]
       (void *) _ZTSPe, (void *) 0L, (void *) _ZTIe };
                ^
../../../../gcc-svn/trunk/libstdc++-v3/src/c++98/compatibility.cc:524:46:
warning: cast from type ‘const void* const*’ to type ‘void*’ casts
away qualifiers [-Wcast-qual]
       (void *) _ZTSPe, (void *) 0L, (void *) _ZTIe };
                                              ^
../../../../gcc-svn/trunk/libstdc++-v3/src/c++98/compatibility.cc:527:16:
warning: cast from type ‘const char*’ to type ‘void*’ casts away
qualifiers [-Wcast-qual]
       (void *) _ZTSPKe, (void *) 1L, (void *) _ZTIe };
                ^
../../../../gcc-svn/trunk/libstdc++-v3/src/c++98/compatibility.cc:527:47:
warning: cast from type ‘const void* const*’ to type ‘void*’ casts
away qualifiers [-Wcast-qual]
       (void *) _ZTSPKe, (void *) 1L, (void *) _ZTIe };

2013-08-07  Uros Bizjak  <ubizjak@gmail.com>

    * src/c++98/compatibility.cc (_ZTIe): Use const_cast to avoid warning.
    (_ZTIPe): Ditto.
    (ZTIPKe): Ditto.

The patch was bootstrapped on alpha-linux-gnu, regression test is still running.

OK for mainline if regtest shows no problems? Also for 4.8?

Uros.

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