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| author | Jussi Kivilinna <jussi.kivilinna@iki.fi> | 2015-03-21 13:01:38 +0200 |
|---|---|---|
| committer | Jussi Kivilinna <jussi.kivilinna@iki.fi> | 2015-03-21 13:01:38 +0200 |
| commit | 92fa5f16d69707e302c0f85b2e5e80af8dc037f1 (patch) | |
| tree | 4bd77b591c6053ba673d437a95b85b754069059f /configure.ac | |
| parent | aa234561d00c3fb15fe501df4bf58f3db7c7c06b (diff) | |
| download | libgcrypt-92fa5f16d69707e302c0f85b2e5e80af8dc037f1.tar.gz | |
bufhelp: use one-byte aligned type for unaligned memory accesses
* cipher/bufhelp.h (BUFHELP_FAST_UNALIGNED_ACCESS): Enable only when
HAVE_GCC_ATTRIBUTE_PACKED and HAVE_GCC_ATTRIBUTE_ALIGNED are defined.
(bufhelp_int_t): New type.
(buf_cpy, buf_xor, buf_xor_1, buf_xor_2dst, buf_xor_n_copy_2): Use
'bufhelp_int_t'.
[BUFHELP_FAST_UNALIGNED_ACCESS] (bufhelp_u32_t, bufhelp_u64_t): New.
[BUFHELP_FAST_UNALIGNED_ACCESS] (buf_get_be32, buf_get_le32)
(buf_put_be32, buf_put_le32, buf_get_be64, buf_get_le64)
(buf_put_be64, buf_put_le64): Use 'bufhelp_uXX_t'.
* configure.ac (gcry_cv_gcc_attribute_packed): New.
--
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@iki.fi>
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 4bbd686c..16f6a21b 100644 --- a/configure.ac +++ b/configure.ac @@ -958,6 +958,24 @@ fi # +# Check whether the compiler supports the GCC style packed attribute +# +AC_CACHE_CHECK([whether the GCC style packed attribute is supported], + [gcry_cv_gcc_attribute_packed], + [gcry_cv_gcc_attribute_packed=no + AC_COMPILE_IFELSE([AC_LANG_SOURCE( + [[struct foo_s { char a; long b; } __attribute__ ((packed)); + enum bar { + FOO = 1 / (sizeof(struct foo_s) == (sizeof(char) + sizeof(long))), + };]])], + [gcry_cv_gcc_attribute_packed=yes])]) +if test "$gcry_cv_gcc_attribute_packed" = "yes" ; then + AC_DEFINE(HAVE_GCC_ATTRIBUTE_PACKED,1, + [Defined if a GCC style "__attribute__ ((packed))" is supported]) +fi + + +# # Check whether the compiler supports 'asm' or '__asm__' keyword for # assembler blocks. # |