RealView Compilation Tools - ARM Information Center

Compiler Command-line Options
See also
• restrict on page 3-8.
2.1.143 --retain=option
This option enables you to restrict the optimizations performed by the compiler, and
might be useful when performing validation, debugging, and coverage testing.
Syntax
--retain=option
Where option is one of the following:
fns
inlinefns
prevents the removal of unused functions
prevents the removal of unused inline functions
noninlinefns prevents the removal of unused non-inline functions
paths
calls
prevents path-removing optimizations, such as a||b transformed to a|b.
This supports Modified Condition Decision Coverage (MCDC) testing.
prevents calls being removed, for example by inlining or tailcalling.
calls:distinct
prevents calls being merged, for example by cross-jumping (that is,
common tail path merging).
libcalls
data
rodata
rwdata
data:order
prevents calls to library functions being removed, for example by inline
expansion.
prevents data being removed.
prevents read-only data being removed.
prevents read-write data being removed.
prevents data being reordered.
See also
• __attribute__((nomerge)) on page 4-35
• __attribute__((notailcall)) on page 4-37.
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