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I am looking for an LTO tape library. Do you have one to spare?
Commit found by message id
Sat, 26 Mar 2011
[ 01:33:11 gerald ] Original commit 
gcc46 lang files touched by this commit GNU Compiler Collection 4.6
Update to the release of GCC 4.6.0 (basically).  Really too many changes
to sensibly list here, but http://gcc.gnu.org/gcc-4.6/changes.html has a
nice overview.

Some highlights include

 - a new quad-precision library that's used by the Fortran frontend
   (on x86 and amd64);
 - new -Wunused-but-set-variable and -Wunused-but-set-parameter warnings
   for C family languages (enabled by -Wall and -Wall -Wextra, too);
 - new -Wdouble-promotion warning for implicit promotions to double;
 - a new general optimization level -Ofast combines -O3 with options that
   can affect standards compliance but result in better optimized code;
 - link-time optimizations (LTO) now scaling to large input sizes, using
   better heuristics, and optimizing more aggressively;
 - new command-line options -fstack-usage and -fstrict-volatile-bitfields
   (for precisely defining and accessing memory-mapped peripheral registers);
 - function attribute leaf that allows for more aggressive optimizations;
 - new data type __int128 for targets having wide enough machine-mode support;
 - support for selectively enabling and disabling warnings via
   #pragma GCC diagnostic has been added. For instance:

     #pragma GCC diagnostic error "-Wuninitialized"
       foo(a);                  /* error is given for this one */
     #pragma GCC diagnostic push
     #pragma GCC diagnostic ignored "-Wuninitialized"
       foo(b);                  /* no diagnostic for this one */
     #pragma GCC diagnostic pop
       foo(c);                  /* error is given for this one */
     #pragma GCC diagnostic pop
      foo(d);                   /* depends on command line options */

 - new command-line option-fmax-errors=N;
 - experimental support for some features from the upcoming ISO C1X;
 - similarly for ISO C++0x including constexpr, nullptr, noexcept,
   unrestricted unions, range-based for loops, opaque enums, implicitly
   deleted functions, and implicit move constructors;
 - default warning when integers are cast to larger pointer types,
   to disable via -Wno-int-to-pointer-cast;
 - signficiantly better diagnostics for C++ code;
 - loads and loads and loads of improvements to the Fortran frontend;
 - a new Go frontend and run-time library;
 - massive work on Objective-C and Objective-C++; notably extensive
   support for Objective-C 2.0  (not enabled by this port yet);
 - support for Intel Core 2 processors (-march=core2, -mtune=core2),
   Intel Core i3/i5/i7 processors /with AVS (-march=corei7, -mtune=corei7,
   -march=corei7-avx, -mtune=corei7-avx);
 - support for AMD Bobcat (fam 14) processors (-march=btver1, -mtune=btver1);

Caveat:

 - Most libstdc++ standard headers have been changed to no longer include
   the cstddef header as an implementation detail.

Number of ports [& non-ports] in this commit: 1

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