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?
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