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@xxxxxxxxxxxxxxxxxxx> 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
:-)
