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tuklib_integer: Autodetect support for unaligned access on ARM.

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The result is used as the default for --enable-unaligned-access.
The test should work with GCC and Clang.
This commit is contained in:
Lasse Collin 2019-06-01 18:46:54 +03:00
parent 3bc112c2d3
commit e5f13a6656
1 changed files with 11 additions and 0 deletions
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11
m4/tuklib_integer.m4
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@ -58,6 +58,17 @@ if test "x$enable_unaligned_access" = xauto ; then
i?86|x86_64|powerpc|powerpc64)
enable_unaligned_access=yes
;;
arm*|aarch64*)
# On 32-bit and 64-bit ARM, GCC and Clang
# #define __ARM_FEATURE_UNALIGNED if
# unaligned access is supported.
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#ifndef __ARM_FEATURE_UNALIGNED
compile error
#endif
int main(void) { return 0; }
])], [enable_unaligned_access=yes], [enable_unaligned_access=no])
;;
*)
enable_unaligned_access=no
;;