Maverick armel cross toolchain
dave.martin at linaro.org
Thu Sep 2 09:55:08 BST 2010
[ un-breaking Loic email address in CC so people reply to the right
place--- not sure what happened there ]
On Thu, Sep 2, 2010 at 9:53 AM, Dave Martin <dave.martin at linaro.org> wrote:
> On Thu, Sep 2, 2010 at 9:31 AM, Ramana Radhakrishnan
> <ramana.radhakrishnan at arm.com> wrote:
>>> > arm-linux-gnueabi-gcc -g -DDEBUG -Os -fno-strict-aliasing
>>> > -fno-common -ffixed-r8 -ffunction-sections -msoft-float -Wcast-align
>>> > -Wall -D__KERNEL__ -DTEXT_BASE= -fno-builtin -ffreestanding -isystem
>>> > /usr/lib/gcc/arm-linux-gnueabi/4.5.1/include -pipe -march=armv4t
>>> > -mlong-calls -mtune=arm7tdmi-s -DCONFIG_ARM -D__ARM__
>>> > -mthumb-interwork -Wall -Wstrict-prototypes -Wcast-align -Wextra
>>> > -Werror -Iobj_redbee-econotag_board -I../board -DBOARD=redbee-econotag
>>> > -I../lib/include -I../src -I. -mthumb -mcallee-super-interworking -MMD
>>> > -c -o obj_redbee-econotag_board/sleep.o sleep.c
>>> > sleep.c:1:0: error: AAPCS does not support -mcallee-super-interworking
>>> This sounds like a missing implementation rather than just a toolchain
>>> flag; or perhaps it's not needed at all with AAPCS?
>> -mcallee-super-interworking is ancient and need not be used with AAPCS
>> toolchains. The linker will deal with interworking issues on AAPCS
>> toolchains by inserting stubs at appropriate locations and arranging for
>> correct control and state transfer at the required interfaces.
> Note that this may only work if the calls to/from the ROM are via
> linker-visible interfaces.
> This means that no magic interworking would happen for things like
> calling magic addresses, or for callback pointers passed into the ROM.
> This is because the the tools have no way to know whether the target
> symbols for call/return are interworking or not in these cases.
> There are some ways around this--- but it's probably best not to get
> into that unless it's really needed.
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