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Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/configure.in b/configure.in index efccf2f7f3..79b30b3144 100644 --- a/configure.in +++ b/configure.in @@ -163,6 +163,19 @@ AC_CHECK_SIZEOF(long) AC_CHECK_SIZEOF(long long) AC_CHECK_SIZEOF(__int64) +# Now, let's see about alignment requirements +AC_CACHE_CHECK([whether unaligned int access is allowed], tor_cv_unaligned_ok, +[AC_RUN_IFELSE([AC_LANG_SOURCE( +[[int main () { char s[] = "A\x00\x00\x00\x00\x00\x00\x00"; +return *(int*)(&s[1]); }]])], + [tor_cv_unaligned_ok=yes], + [tor_cv_unaligned_ok=no], + [tor_cv_unaligned_ok=cross])]) +if test tor_cv_unaligned_ok = yes; then + AC_DEFINE([UNALIGNED_INT_ACCESS_OK], 1, + [Define to 1 iff unaligned int access is allowed]) +fi + # $prefix stores the value of the --prefix command line option, or # NONE if the option wasn't set. In the case that it wasn't set, make # it be the default, so that we can use it to expand directories now. |