<iosfwd> also standard for std::string declaration?

[Martin Sebor]

landrum Alfred wrote:
> No, the 300ms is stable, that's from taking  4-5 runs.
>  I'd guess that's not coming about from disk io, its
> that the compiler has to go through 350k more source:

FWIW, with gcc 3.x we have also noticed am increase in compile
times. One of the reasons could be the compiler itself, but
another might also be the size and complexity of the libstdc++
headers. It might be interesting to compare the sizes of
translation units of various implementations. Here are the
results for Rogue Wave libstd 3.1.1 on SunOS 5.7, gcc 3.2 on
SunOS 5.7, STLport 4.5 on SunOS 5.7, and Dinkum C++ Standard
Library on AIX 5.1 with VAC++ 6.0 (after stripping blank lines
and lines beginning with the pound sign):

                  RW libstd    libstdc++      STLport   Dinkumware
   ===========  ===========  ===========  ===========  ===========
   algorithm :         3595         5689         4148         5566
   bitset    :         4250        17562        10254         8642
   complex   :         8992        18190        11230        10162
   deque     :         2262         4954         3069         5653
   exception :          103           38          101          149
   fstream   :         8580        17506        10753         8567
   functional:          562          427          626          433
   iomanip   :         4645        16967         9784         8187
   ios       :         5495        11776         6600         6776
   iosfwd    :          894         1155         1428         1334
   iostream  :         7489        16806         9689         8156
   istream   :         7474        16794         9674         8126
   iterator  :         1884        16894         9763         2185
   limits    :          285          758         1777         3177
   list      :         2250         4442         2487         5903
   locale    :         7914        14840        11287         9564
   map       :         2783         5418         2978         6213
   memory    :         1039         3823         2209         3888
   new       :          184           83          158          197
   numeric   :          396        17003         1110         2268
   ostream   :         6673        15577         7837         7411
   queue     :         6497         6367         4948         8693
   set       :         2713         5387         2956         6194
   sstream   :         7907        17191        10193         8706
   stack     :         2349         4990         3105         5722
   stdexcept :          211         8676         2046         4471
   streambuf :         4760         9914         6173         5863
   string    :         3901         8613         5306         8370
   strstream :         7629        16885         9770         8257
   typeinfo  :          149           92          158          750
   utility   :          177           91          288         1405
   valarray  :         6643        19162         7367         3024
   vector    :         2399         4953         2994         5797

Regards
Martin