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[libpng17] Attempt to fix the arm-neon configuration mess.

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This commit is contained in:
John Bowler
2013-04-24 00:07:59 -05:00
committed by Glenn Randers-Pehrson
parent 3de174cd2f
commit e0f4aaa668
5 changed files with 31 additions and 15 deletions
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31
configure.ac
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@@ -334,19 +334,26 @@ AC_ARG_WITH(libpng-prefix,
fi])
AM_CONDITIONAL([DO_PNG_PREFIX], [test "${with_libpng_prefix:-no}" != "no"])
# HOST SPECIFIC OPTIONS
# =====================
#
# ARM
# ===
#
# ARM NEON (SIMD) support.
AC_ARG_ENABLE([arm-neon],
AS_HELP_STRING([[[--enable-arm-neon]]],
[Enable ARM NEON optimizations: =off, check, api, on:]
[off: disable the optimizations; check: use internal checking code]
[Enable ARM NEON optimizations: =no/off, check, api, yes/on:]
[no/off: disable the optimizations; check: use internal checking code]
[(deprecated and poorly supported); api: disable by default, enable by]
[a call to png_set_option; on: turn on unconditionally. The]
[default is 'on' if __ARM_NEON__ is defined, otherwise 'off'.]),
[a call to png_set_option; yes/on: turn on unconditionally.]),
[case "$enableval" in
no|off)
# disable the default enabling on __ARM_NEON__ systems:
AC_DEFINE([PNG_NO_ARM_NEON], [],
[Disable ARM Neon optimizations])
# Prevent use of the assembler files below:
# Prevent inclusion of the assembler files below:
enable_arm_neon=no;;
check)
AC_DEFINE([PNG_ARM_NEON_CHECK_SUPPORTED], [],
@@ -354,13 +361,21 @@ AC_ARG_ENABLE([arm-neon],
api)
AC_DEFINE([PNG_ARM_NEON_API_SUPPORTED], [],
[Turn on ARM Neon optimizations at run-time]);;
on)
yes|on)
AC_DEFINE([PNG_ARM_NEON_SUPPORTED], [],
[Enable ARM Neon optimizations]);;
*)
AC_MSG_ERROR([arm-neon: option value required (off/check/api/on)]);;
AC_MSG_ERROR([--enable-arm-neon=${enable_arm_neon}: invalid value])
esac])
AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" != "no"])
# If enable/disable was not specified default to using the optimizations if the
# host CPU is ARM and the comppiler is targeting a NEON host. The latter test
# is done in scripts/pnglibconf.dfa by checking for __ARM_NEON__. The
# AM_CONDITIONAL below controls whether the ARM NEON source files are built.
AM_CONDITIONAL([PNG_ARM_NEON],
[test "$enable_arm_neon" != 'no' &&
test "$host_cpu" = 'arm' -o "$enable_arm_neon" != ''])
AC_MSG_NOTICE([[Extra options for compiler: $PNG_COPTS]])