Frame pointer not getting eliminated

[U.Mutlu]

U.Mutlu wrote on 03/29/2019 01:46 PM:
> William Tambe wrote on 03/29/2019 03:24 AM:
>> On Thu, Mar 28, 2019 at 3:07 PM Segher Boessenkool
>> <segher@kernel.crashing.org> wrote:
>>>
>>> Hi!
>>>
>>> On Thu, Mar 28, 2019 at 12:26:13PM -0500, William Tambe wrote:
>>>> I am doing porting work and writing a backend using GCC 8.2.0.
>>>>
>>>> Despite the following #defines, the frame pointer is not getting
>>>> eliminated; any idea why GCC would still generate a frame pointer ?
>>>
>>> Do you use -fomit-frame-pointer (perhaps indirectly from -O, or from a
>>> default)?
>>
>> -O2 is being used; I can't tell whether -fomit-frame-pointer is being used.
>
> Hi,
> try the following script (4 lines) to get a list of all the effective options
> for each of gcc and g++.
> Replace with your compiler's path and names.
> The results will be in the two *.t files:
>
> #!/bin/bash
> CCDIR=/sw/src/cross/INSTALL_DIR
> echo "int main() { return 0; }" | $CCDIR/bin/arm-linux-gnueabihf-gcc -Q -v -x
> c   -Ofast -  >cpl_options_gcc.t 2>&1 ; rm a.out
> echo "int main() { return 0; }" | $CCDIR/bin/arm-linux-gnueabihf-g++ -Q -v -x
> c++ -Ofast -  >cpl_options_g++.t 2>&1 ; rm a.out

Fix:
of course replace -Ofast by your -O2
:-)