Hi Guys,
I am checking in this patch to the mainline to document the ARM port's
-munaligned-access command line option.
Cheers
Nick
gcc/ChangeLog
2012-07-18 Nick Clifton <ni...@redhat.com>
* doc/invoke.texi (ARM Options): Document -munaligned-access.
Index: gcc/doc/invoke.texi
===================================================================
--- gcc/doc/invoke.texi (revision 189603)
+++ gcc/doc/invoke.texi (working copy)
@@ -497,7 +497,8 @@
-mcaller-super-interworking -mcallee-super-interworking @gol
-mtp=@var{name} -mtls-dialect=@var{dialect} @gol
-mword-relocations @gol
--mfix-cortex-m3-ldrd}
+-mfix-cortex-m3-ldrd @gol
+-munaligned-access}
@emph{AVR Options}
@gccoptlist{-mmcu=@var{mcu} -maccumulate-args -mbranch-cost=@var{cost} @gol
@@ -11049,6 +11050,23 @@
generating these instructions. This option is enabled by default when
@option{-mcpu=cortex-m3} is specified.
+@item -munaligned-access
+@itemx -mno-unaligned-access
+@opindex munaligned-access
+@opindex mno-unaligned-access
+Enables (or disables) reading and writing of 16- and 32- bit values
+from addresses that are not 16- or 32- bit aligned. By default
+unaligned access is disabled for all pre-ARMv6 and all ARMv6-M
+architectures, and enabled for all other architectures. If unaligned
+access is not enabled then words in packed data structures will be
+accessed a byte at a time.
+
+The ARM attribute @code{Tag_CPU_unaligned_access} will be set in the
+generated object file to either true or false, depending upon the
+setting of this option. If unaligned access is enabled then the
+preprocessor symbol @code{__ARM_FEATURE_UNALIGNED} will also be
+defined.
+
@end table
@node AVR Options
