This option specifies whether you are using the Procedure Call Standard for the ARM Architecture (AAPCS). It can also specify some attributes of code sections.
The AAPCS forms part of the Base Standard Application Binary Interface for the ARM Architecture (BSABI) specification. By writing code that adheres to the AAPCS, you can ensure that separately compiled and assembled modules can work together.
Note
AAPCS qualifiers do not affect the code produced by the assembler.
They are an assertion by the programmer that the code in inputfile
Values for qualifier
noneSpecifies that
inputfilenone./interwork,/nointerwork/interworkspecifies that the code in theinputfilecan interwork between ARM and Thumb safely. The default is/nointerwork./inter,/nointerAre synonyms for
/interworkand/nointerwork./ropi,/noropi/ropispecifies that the code ininputfileis Read-Only Position-Independent (ROPI). The default is/noropi./pic,/nopicAre synonyms for
/ropiand/noropi./rwpi,/norwpi/rwpispecifies that the code ininputfileis Read-Write Position-Independent (RWPI). The default is/norwpi./pid,/nopidAre synonyms for
/rwpiand/norwpi./fpic,/nofpic/fpicspecifies that the code ininputfileis read-only independent and references to addresses are suitable for use in a Linux shared object. The default is/nofpic./hardfp,/softfpRequests hardware or software floating-point linkage. This enables the procedure call standard to be specified separately from the version of the floating-point hardware available through the
--fpuoption. It is still possible to specify the procedure call standard by using the--fpuoption, but ARM recommends you use--apcs. If floating-point support is not permitted (for example, because--fpu=noneis specified, or because of other means), then/hardfpand/softfpare ignored. If floating-point support is permitted and the softfp calling convention is used (--fpu=softvfpor--fpu=softvfp+vfp...), then/hardfpgives an error.
Note
You must specify at least one qualifier.
If you specify more than one qualifier,
ensure that there are no spaces or commas between the individual
qualifiers in the list.
ExampleProcedure Call Standard for the ARM Architecture.
Compiler Reference:
Developing Software for ARM Processors:
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