g++-compiled objects big :-(

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1 total messages Started by Georg Feil Sat, 09 Dec 1989 00:37

#237

Author: Georg Feil
Date: Sat, 09 Dec 1989 00:37

30 lines
1611 bytes

I have a small ANSI C program I'm running on a simple custom 68020 target
system. The same program compiles just as easily with g++ as with gcc,
but the resulting binary is several times larger: (!)

-rwxr-xr-x  1 georg       17374 Dec  8 18:29 test-gcc*
-rwxr-xr-x  1 georg       51986 Dec  8 19:02 test-g++*
 
Size is rather of the essence, as the program gets sent to the target
system in S-records at 9600 baud. By examining the object file using nm,
I discovered large amounts of trash from libg++ being included for no
apparent reason. In particular, builtin.cc is a major culprit. It gets
included merely to resolve a reference to '__1xyzzy__' from __main().

My question:

 What exactly is needed from libg++ to link a dead-simple C++ program?
 In particular, is all the other junk in builtin.cc really necessary, or 
 will it do to put the definition for '__1xyzzy__' in a separate .cc file?


Awaiting wisdom from the wizards,

Georg.
-- 
Georg Feil                                 Internet: ghfeil@white.toronto.edu
                                             -or-  : georg@sgl.ists.ca
...if all else fails, try:
{uunet,pyramid,watmath,utzoo}!utcsri!white!ghfeil
ghfeil%white.toronto.edu@relay.cs.net     (ARPA)

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