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| author | Lasse Collin <lasse.collin@tukaani.org> | 2019-06-01 18:46:54 +0300 |
|---|---|---|
| committer | Lasse Collin <lasse.collin@tukaani.org> | 2019-06-01 18:46:54 +0300 |
| commit | e5f13a66567b1987e0aae42c6fdcd277bb5810ba (patch) | |
| tree | 5bb062a4be1fb44578c26142d700b61490f15c0f /m4 | |
| parent | tuklib_integer: Improve unaligned memory access. (diff) | |
| download | xz-e5f13a66567b1987e0aae42c6fdcd277bb5810ba.tar.xz | |
tuklib_integer: Autodetect support for unaligned access on ARM.
The result is used as the default for --enable-unaligned-access.
The test should work with GCC and Clang.
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/tuklib_integer.m4 | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/m4/tuklib_integer.m4 b/m4/tuklib_integer.m4 index 2ab72a2f..c3c59fe3 100644 --- a/m4/tuklib_integer.m4 +++ b/m4/tuklib_integer.m4 @@ -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 ;; |