This is the mail archive of the cygwin@cygwin.com mailing list for the Cygwin project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Strange behaviour of gcc


Can somebody explain why gcc (version 3.2 20020927) on Cygwin does this?
Type this simple C program

void func(void){
  struct {unsigned char data[3985];}var;
}

and compile with

gcc -c filename.c

Then type

nm filename.o

The output is

00000000 b .bss
00000000 d .data
00000000 t .text
         U __alloca
00000000 T _func

Why on earth is the symbol __alloca doing there?

Just change the program to

void func(void){
  struct {unsigned char data[3984];}var;
}

and compile it. This time, nm's output is

00000000 b .bss
00000000 d .data
00000000 t .text
00000000 T _func

as it should. Is there a reason why the symbol __alloca appears?

__________________________________________________________________
Tiscali ADSL. Scopri la fantastica promozione di Natale: tutto Gratis fino
al 9 gennaio!
Abbonati ora: prima ti abboni, pił risparmi!
http://point.tiscali.it/adsl/index.shtml




--
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple
Bug reporting:         http://cygwin.com/bugs.html
Documentation:         http://cygwin.com/docs.html
FAQ:                   http://cygwin.com/faq/


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]