gcc iussue or ... ?
gmarco at scotty.masternet.it
Sat Apr 12 13:39:03 PDT 2003
At 12/04/2003, you wrote:
> > So the point is why Linux/mingw have a lot of things in bss while 4.8
> > the same gcc of linux debian 3.0 and 5.0 with the same gcc 3.2.1 of mingw)
> > put them in Data ?
>Maybe Linux is using the "-fconserve-space" g++ option. From the
> Put uninitialized or runtime-initialized global variables into the
> common segment, as C does. This saves space in the executable at
> the cost of not diagnosing duplicate definitions. If you compile
> with this flag and your program mysteriously crashes after
> `main()' has completed, you may have an object that is being
> destroyed twice because two definitions were merged.
> This option is no longer useful on most targets, now that support
> has been added for putting variables into BSS without making them
>That last paragraph suggests that maybe FreeBSD's compiler is
>configured slightly wrong, such that it does not do what the
>paragraph says. In any case, try adding this option to your
>compiles on FreeBSD and see if it helps.
This exactly solve the problem :-)
The compilation is fine, the exe is now 2mb (like linux).
/source_of_lonejoy/src# ll -h lonewolf
-rwxr-xr-x 1 root wheel 2M Apr 12 22:24 lonewolf
Using such lines in Makefile.unix:
CFLAGS = -pipe -funsigned-char -fconserve-space -O -DNO_DEBUG
CXXFLAGS= -pipe -funsigned-char -fconserve-space -O -DNO_DEBUG
did the job.
Now we have to understand why the Linux version of the same gcc doesn't
need this option to make the exe so small :-)
Thanks very much.
Gianmarco Giovannelli , "Unix expert since yesterday"
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