[英]How do I disable tailcall optimizations in gcc
Wondering if anyone knows the flag for gcc to disable tailcall optimizations. 想知道是否有人知道gcc的标志来禁用尾部调用优化。 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.
基本上,在尾调用优化中,当被调用函数的返回值通过(通过return)传递或函数中没有其他任何事情发生时,gcc将替换堆栈帧。
That is, in 也就是说,在
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. 当foo调用bar时,gcc发出的代码将替换foo的堆栈框架,而不是添加新的堆栈框架。
My company has a stack unwinder that can print out a stack trace from any point in code. 我公司有一个堆栈展开器,可以从代码的任何点打印出堆栈跟踪。 tailcall optimization makes stack frames disappear, which can confuse the stack trace somewhat.
尾调用优化使堆栈帧消失,这可能会使堆栈跟踪有些混乱。
I am compiling for x86-64 using gcc4.3. 我正在使用gcc4.3为x86-64进行编译。
Thanks in advance! 提前致谢! P
P
GCC manual: GCC手册:
-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
. 因此,可以使用
-O0
/ -O1
进行编译,也可以使用-fno-optimize-sibling-calls
进行编译。
Untested: -fno-optimize-sibling-calls
未经测试:
-fno-optimize-sibling-calls
http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html
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