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Fix long long little endian detection when cross-compiling

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The long long endian detection code does an AC_TRY_RUN() and since that
doesn't work when cross-compiling, it sets a fallback value.  However,
rather than do any sort of default endian detection, the code simply
sets it to "no".  This probably breaks most little endian systems out
there when cross-compiling for them.  It certainly breaks Blackfin
systems.  So use the common endian detection code provided by autoconf
and key off of that when cross-compiling.

* configure.ac: Call AC_C_BIGENDIAN.
* m4/long_long.m4 (AC_LITTLE_ENDIAN_LONG_LONG): Set cross-compiling
logic based on ac_cv_c_bigendian.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2010-09-12 03:39:55 -04:00 committed by Dmitry V. Levin
parent 260e571343
commit 6d12afdac4
2 changed files with 7 additions and 2 deletions
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1
configure.ac
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@ -184,6 +184,7 @@ AC_PROG_CPP
AC_PROG_GCC_TRADITIONAL
AC_PROG_INSTALL
AC_C_CONST
AC_C_BIGENDIAN
AC_HEADER_STDC
AC_HEADER_STDBOOL
AC_HEADER_DIRENT

8
m4/long_long.m4
View File

@ -57,8 +57,12 @@ int main () {
return 0;
return 1;
}
]])],[ac_cv_have_little_endian_long_long=yes],[ac_cv_have_little_endian_long_long=no],[# Should try to guess here
ac_cv_have_little_endian_long_long=no
]])],[ac_cv_have_little_endian_long_long=yes],[ac_cv_have_little_endian_long_long=no],[
if test "x$ac_cv_c_bigendian" = "xyes"; then
ac_cv_have_little_endian_long_long=no
else
ac_cv_have_little_endian_long_long=yes
fi
])])
AC_MSG_RESULT($ac_cv_have_little_endian_long_long)
if test "$ac_cv_have_little_endian_long_long" = yes