Question #256933: Internal Compiler error with Cortex M0+ and -mtpcs-leaf-frame

[Uwe Bonnes]

This is the source file to reproduce the problem reported in #256033. The files have only some additions to be self-consistant and don't need further include. Further discussion is added to question #256033.

[Terry Guo (terry.guo)]

It's strange that I still can't reproduce it. Here is my screen paste:

terguo01@terry-pc01:mtpcs-frame$ ls
core_cm0plus.h core_cmFunc.h core_cmInstr.h test.c
terguo01@terry-pc01:mtpcs-frame$ cat test.c
#include "core_cm0plus.h"
int main(void)
{
    return 0;
}
terguo01@terry-pc01:mtpcs-frame$ /work/terguo01/tools/gcc-arm-none-eabi-4_8-2014q3/bin/arm-none-eabi-gcc -c -MD -MP -mcpu=cortex-m0plus -mthumb -D__CORTEX__ -ffunction-sections -fdata-sections -fomit-frame-pointer -g3 -Og -Wall -Wstrict-prototypes -Werror -O0 -mtpcs-frame -fno-omit-frame-pointer test.c
terguo01@terry-pc01:mtpcs-frame$ echo $?
0

gcc version 4.8.4 20140725 (release) [ARM/embedded-4_8-branch revision 213147] (GNU Tools for ARM Embedded Processors)

Are you sure you can trigger the error through my above steps?

[Uwe Bonnes (bon)]

Terry,

my deepest regrets for pointing you in the wrong direction. The culprit is "-mtpcs-leaf-frame " as visible in the difference of the commandlines given with my original question and in the title of the question and bug report

Please, try with -mtpcs-leaf-frame

I can now also reproduce with the MBED include like
>arm-none-eabi-gcc -c -MD -MP -mcpu=cortex-m0plus -mthumb -D__CORTEX__ -ffunction-sections -fdata-sections -fomit-frame-pointer -g3 -Og -Wall -Wstrict-prototypes -Werror -O0 -mtpcs-frame -mtpcs-leaf-frame -fno-omit-frame-pointer test.c -I/devel/mbed/libraries/mbed/targets/cmsis/ -DIRQn_Type=int -D__NVIC_PRIO_BITS=2 -DSysTick_IRQn=0

[Terry Guo (terry.guo)]

Now I can reproduce the issue for 4.8 and trunk.

terguo01@terry-pc01:mtpcs-frame$ /work/terguo01/tools/gcc-arm-none-eabi-5_0-2014q4/bin/arm-none-eabi-gcc -c -MD -MP -mcpu=cortex-m0plus -mthumb -D__CORTEX__ -ffunction-sections -fdata-sections -fomit-frame-pointer -g3 -Og -Wall -Wstrict-prototypes -Werror -O0 -mtpcs-leaf-frame -fno-omit-frame-pointer test.c
test.c: In function 'main':
test.c:5:1: error: unrecognizable insn:
 }
 ^
(insn 20 19 21 (set (reg:SI 2 r2)
        (reg:SI 15 pc)) test.c:3 -1
     (nil))
test.c:5:1: internal compiler error: in extract_insn, at recog.c:2327
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

gcc version 5.0.0 20141106 (experimental) [trunk revision 217200] (GNU Tools for ARM Embedded Processors)

[Uwe Bonnes (bon)]

Any progess on this bug?

The bug still happens with gcc-arm-none-eabi-4_9-2015q1.

[Terry Guo (terry.guo)]

We are going to deprecate all TPCS related options https://gcc.gnu.org/gcc-5/changes.html. So please try not using them.

[Uwe Bonnes (bon)]

Dear Terry,

can you tell what compiler option now has to be used for generating stack frames? Looking at the manpage, the only none-tpcs stack frame related option is "-mapcs-frame" which is also deprecated.

Thanks

[Terry Guo (terry.guo)]

Some one is asking similar question https://gcc.gnu.org/ml/gcc-help/2015-03/msg00098.html. Please allow me to check internally and then get back to you.

[Uwe Bonnes (bon)]

Dear Terry,

any news on this subject?

[Terry Guo (terry.guo)]

Dear Uwe,

Really sorry for my slow response. Please refer to this mail https://gcc.gnu.org/ml/gcc-help/2015-05/msg00080.html.

[Uwe Bonnes (bon)]

The bug still happens with gcc-arm-none-eabi-4_9-2015q2.

[Tejas Belagod (belagod-tejas)]

Hi Uwe, does this happen with -mapcs-frame or the old option -mtpcs-leaf-frame?
Thanks.

[Uwe Bonnes (bon)]

I happens when mtpcs-leaf-frame is given. With only mtpcs-frame, the sample program compiles.

[Uwe Bonnes (bon)]

However mtpcs-leaf-frame is needed to get full backtrace information for leaf function. Any chance to get mtpcs-leaf-frame fixed?