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configure.ac: add AC_C_BIGENDIAN

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this defines WORDS_BIGENDIAN, replacing uses of
__BIG_ENDIAN__/__BYTE_ORDER__ with it

+ fixes lossless BGRA output with big-endian toolchains
  that do not define __BIG_ENDIAN__ (codesourcery mips gcc)

Change-Id: Ieaccd623292d235343b5e34b7a720fc251c432d7
This commit is contained in:
James Zern
2014-06-28 12:27:17 -07:00
parent ee70a90187
commit 380cca4f2c
5 changed files with 16 additions and 8 deletions
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3
configure.ac
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@ -15,6 +15,9 @@ AM_PROG_CC_C_O
dnl === Enable less verbose output when building.
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
dnl == test endianness
AC_C_BIGENDIAN
dnl === SET_IF_UNSET(shell_var, value)
dnl === Set the shell variable 'shell_var' to 'value' if it is unset.
AC_DEFUN([SET_IF_UNSET], [test "${$1+set}" = "set" || $1=$2])