On 04/07/2020 01:03, Chris Johns wrote:
On 3/7/20 5:06 pm, Sebastian Huber wrote:
Hello,
someone from ARM changed the machine options used to build the RTEMS multilibs
some time ago (I think GCC 8):
Was a reason given?
ARM thinks the new options are easier to use.
arm-rtems6-gcc -print-multi-lib -march=armv4t
.;
thumb;@mthumb
armv5te+fp/hard;@march=armv5te+fp@mfloat-abi=hard
thumb/armv6-m;@mthumb@march=armv6-m
thumb/armv7-a;@mthumb@march=armv7-a
thumb/armv7-r;@mthumb@march=armv7-r
thumb/cortex-m3;@mthumb@mcpu=cortex-m3
thumb/cortex-m4+nofp;@mthumb@mcpu=cortex-m4+nofp
thumb/armv7-a+simd/hard;@mthumb@march=armv7-a+simd@mfloat-abi=hard
thumb/armv7-r+fp/hard;@mthumb@march=armv7-r+fp@mfloat-abi=hard
thumb/cortex-m4/hard;@mthumb@mcpu=cortex-m4@mfloat-abi=hard
thumb/cortex-m7/hard;@mthumb@mcpu=cortex-m7@mfloat-abi=hard
eb/thumb/armv7-r;@mbig-endian@mthumb@march=armv7-r
eb/thumb/armv7-r+fp/hard;@mbig-endian@mthumb@march=armv7-r+fp@mfloat-abi=hard
It seems that our current machine options still map to the right multilib:
arm-rtems6-gcc -print-multi-directory -march=armv7-a -mthumb -mfpu=neon
-mfloat-abi=hard -mtune=cortex-a9
thumb/armv7-a+simd/hard
arm-rtems6-gcc -print-multi-directory -mthumb -mcpu=cortex-m4 -mfpu=fpv4-sp-d16
-mfloat-abi=hard
thumb/cortex-m4/hard
arm-rtems6-gcc -print-multi-directory -march=armv7-r -mthumb -mbig-endian
eb/thumb/armv7-r
arm-rtems6-gcc -print-multi-directory -march=armv7-r -mthumb -mbig-endian
-mfpu=vfpv3-d16 -mfloat-abi=hard
eb/thumb/armv7-r+fp/hard
Should we change the options to match the ones given in the multilib definition
or should we keep the current options? If we change the options, then we can no
longer build with GCC 7.
Would we need to build gcc 7 for RTEMS 6?
No, but for a git bisect it would be nice to use the RTEMS 5 compiler
for a while for the master branch.
Since the new build system will be a hard break, maybe we should keep
the options as is in the old build system and start with the new options
in the new build system.
_______________________________________________
devel mailing list
devel@rtems.org
http://lists.rtems.org/mailman/listinfo/devel
