Visible to Intel only — GUID: GUID-9ECCD2E7-EBFE-44DC-B07D-415DE59F32CA
Visible to Intel only — GUID: GUID-9ECCD2E7-EBFE-44DC-B07D-415DE59F32CA
fomit-frame-pointer, Oy
Determines whether EBP is used as a general-purpose register in optimizations. Option /Oy is deprecated and will be removed in a future release.This feature is only available for ifort.
Architecture Restrictions
Option /Oy[-] is only available on IA-32 architecture. IA-32 support is deprecated and will be removed in a future release.
Syntax
Linux: |
-fomit-frame-pointer -fno-omit-frame-pointer |
macOS: |
-fomit-frame-pointer -fno-omit-frame-pointer |
Windows: |
/Oy /Oy- |
Arguments
None
Default
-fomit-frame-pointer |
EBP is used as a general-purpose register in optimizations. However, the default can change depending on the following: Linux and macOS If option -O0 or -g is specified, the default is -fno-omit-frame-pointer. Windows If option /Od is specified, the default is /Oy- . |
Description
These options determine whether EBP is used as a general-purpose register in optimizations. Option -fomit-frame-pointer and option /Oy allows this use. Option -fno-omit-frame-pointer and option /Oy- disallows it.
Some debuggers expect EBP to be used as a stack frame pointer, and cannot produce a stack backtrace unless this is so. The -fno-omit-frame-pointer and the /Oy- option directs the compiler to generate code that maintains and uses EBP as a stack frame pointer for all functions so that a debugger can still produce a stack backtrace without doing the following:
For -fno-omit-frame-pointer: turning off optimizations with -O0
For /Oy-: turning off /O1, /O2, or /O3 optimizations
The -fno-omit-frame-pointer option is set when you specify option -O0 or the -g option. The -fomit-frame-pointer option is set when you specify option -O1, -O2, or -O3.
The /Oy option is set when you specify the /O1, /O2, or /O3 option. Option /Oy- is set when you specify the /Od option.
Using the -fno-omit-frame-pointer or /Oy- option reduces the number of available general-purpose registers by 1, and can result in slightly less efficient code.
IDE Equivalent
Visual Studio: Optimization > Omit Frame Pointers
Alternate Options
Linux and macOS: -fp (this is a deprecated option)
Windows: None