Wondering if anyone knows the flag for gcc to disable tailcall optimizations. Basically in a tailcall optimization, gcc will replace a stack frame when the return value from a called function is passed through (via return) or nothing else happens in the function.
That is, in
void main() {
foo();
}
void foo() {
bar();
}
void bar() {
/* at this point in code, the foo() stack frame no longer exists! */
}
When foo calls bar, gcc emits code that replaces the stack frame for foo, rather than adding a new stack frame.
My company has a stack unwinder that can print out a stack trace from any point in code. tailcall optimization makes stack frames disappear, which can confuse the stack trace somewhat.
I am compiling for x86-64 using gcc4.3.
Thanks in advance! P
GCC manual:
-foptimize-sibling-calls
Optimize sibling and tail recursive calls.
Enabled at levels -O2, -O3, -Os.
So either compile with -O0
/ -O1
, or use -fno-optimize-sibling-calls
.
Untested: -fno-optimize-sibling-calls
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