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configure: add --enable-aligned

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forces aligned memory reads (via memcpy) in the VP8 bit reader, useful
for platforms that don't support unaligned loads.

Change-Id: Ifa44a9a1677fbdc6a929520f9340b7e3fcbd6692
This commit is contained in:
James Zern
2014-07-03 23:06:06 -07:00
parent 380cca4f2c
commit dc0f479d6a
2 changed files with 25 additions and 1 deletions
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13
configure.ac
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@ -410,6 +410,19 @@ if test "$target_os" = "mingw32" -a "$enable_wic" = "yes"; then
fi
fi
dnl === If --enable-aligned is defined, define WEBP_FORCE_ALIGNED
AC_MSG_CHECKING(if --enable-aligned option is specified)
AC_ARG_ENABLE([aligned],
AS_HELP_STRING([--enable-aligned],
[Force aligned memory operations in non-dsp code
(may be slower)]))
if test "$enable_aligned" = "yes"; then
AC_DEFINE(WEBP_FORCE_ALIGNED, [1],
[Define to 1 to force aligned memory operations])
fi
AC_MSG_RESULT(${enable_aligned-no})
dnl === If --enable-swap-16bit-csp is defined, add -DWEBP_SWAP_16BIT_CSP
USE_SWAP_16BIT_CSP=""