• Timo Sintonen (26/26) Jan 18 2015 I have been trying to compile multilib for cortex-m0/m3/m4
• Jens Bauer (5/8) Apr 04 2015 shouldn't fpv4 be fpuv4 =?

"Timo Sintonen" <t.sintonen luukku.com> writes:

I have been trying to compile multilib for cortex-m0/m3/m4

I added this to gcc/config/arm/t-arm-elf:

MULTILIB_OPTIONS  += mcpu=cortex-m0/mcpu=cortex-m3/mcpu=cortex-m4 
  mfloat-abi=hard mfpu=fpv4-sp-d16
MULTILIB_DIRNAMES += cortex-m0 cortex-m3 cortex-m4
MULTILIB_REQUIRED += mcpu=cortex-m0
MULTILIB_REQUIRED += mcpu=cortex-m3
MULTILIB_REQUIRED += mcpu=cortex-m4
MULTILIB_EXTRA_OPTS += mthumb

The first line tells to build all combinations of those options 
but the next three lines telss to build only with these options. 
The last adds that option to all builds.

This works and makes three libraries with the correct cpu option.

This does not work although it should according to
https://gcc.gnu.org/onlinedocs/gccint/Target-Fragment.html

MULTILIB_OPTIONS  += mcpu=cortex-m0/mcpu=cortex-m3/mcpu=cortex-m4 
  mfloat-abi=hard mfpu=fpv4-sp-d16
MULTILIB_DIRNAMES += cortex-m0 cortex-m3 cortex-m4
MULTILIB_REQUIRED += mcpu=cortex-m0
MULTILIB_REQUIRED += mcpu=cortex-m3
MULTILIB_REQUIRED += 
mcpu=cortex-m4/mfloat-abi=hard/mfpu=fpv4-sp-d16
MULTILIB_EXTRA_OPTS += mthumb

After creating cortex-m4 directory the error message is:
././ is a directory

Does anybody have any idea or should I ask this in gcc list?

"Jens Bauer" <doctor who.no> writes:

On Sunday, 18 January 2015 at 18:15:32 UTC, Timo Sintonen wrote:
 MULTILIB_OPTIONS  += 
 mcpu=cortex-m0/mcpu=cortex-m3/mcpu=cortex-m4
  mfloat-abi=hard mfpu=fpv4-sp-d16

shouldn't fpv4 be fpuv4 =?

For comparison / ideas, try my modification; I took a launchpad 
t-arm-elf and added arm7tdmi:

curl -O dl.gpio.dk/t-arm-elf-4.9.2.patch