OpenWrt – Blame information for rev 4
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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4 | office | 1 | dnl AS_UNALIGNED_ACCESS |
| 2 | |||
| 3 | dnl check if unaligned memory access works correctly |
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| 4 | AC_DEFUN([AS_UNALIGNED_ACCESS], [ |
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| 5 | AC_MSG_CHECKING([if unaligned memory access works correctly]) |
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| 6 | if test x"$as_cv_unaligned_access" = x ; then |
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| 7 | case $host in |
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| 8 | alpha*|arm*|hp*|mips*|sh*|sparc*|ia64*) |
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| 9 | _AS_ECHO_N([(blacklisted) ]) |
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| 10 | as_cv_unaligned_access=no |
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| 11 | ;; |
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| 12 | i?86*|x86_64|amd64|powerpc*|m68k*|cris*) |
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| 13 | _AS_ECHO_N([(whitelisted) ]) |
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| 14 | as_cv_unaligned_access=yes |
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| 15 | ;; |
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| 16 | esac |
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| 17 | else |
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| 18 | _AS_ECHO_N([(cached) ]) |
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| 19 | fi |
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| 20 | if test x"$as_cv_unaligned_access" = x ; then |
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| 21 | AC_TRY_RUN([ |
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| 22 | int main(int argc, char **argv) |
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| 23 | { |
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| 24 | char array[] = "ABCDEFGH"; |
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| 25 | unsigned int iarray[2]; |
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| 26 | memcpy(iarray,array,8); |
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| 27 | #define GET(x) (*(unsigned int *)((char *)iarray + (x))) |
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| 28 | if(GET(0) != 0x41424344 && GET(0) != 0x44434241) return 1; |
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| 29 | if(GET(1) != 0x42434445 && GET(1) != 0x45444342) return 1; |
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| 30 | if(GET(2) != 0x43444546 && GET(2) != 0x46454443) return 1; |
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| 31 | if(GET(3) != 0x44454647 && GET(3) != 0x47464544) return 1; |
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| 32 | return 0; |
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| 33 | } |
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| 34 | ], as_cv_unaligned_access="yes", as_cv_unaligned_access="no") |
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| 35 | fi |
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| 36 | AC_MSG_RESULT($as_cv_unaligned_access) |
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| 37 | if test "$as_cv_unaligned_access" = "yes"; then |
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| 38 | AC_DEFINE_UNQUOTED(HAVE_UNALIGNED_ACCESS, 1, |
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| 39 | [defined if unaligned memory access works correctly]) |
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| 40 | fi |
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| 41 | ]) |