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missing-macros: add as-unaligned-access.m4

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SVN-Revision: 24878
This commit is contained in:
Jo-Philipp Wich 2011-01-02 01:23:44 +00:00
parent c208b4a102
commit 4b8799280f
3 changed files with 48 additions and 1 deletions
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2
tools/missing-macros/Makefile
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@ -8,7 +8,7 @@
include $(TOPDIR)/rules.mk include $(TOPDIR)/rules.mk
PKG_NAME:=missing-macros PKG_NAME:=missing-macros
PKG_VERSION:=8 PKG_VERSION:=9
include $(INCLUDE_DIR)/host-build.mk include $(INCLUDE_DIR)/host-build.mk

6
tools/missing-macros/src/README
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@ -79,6 +79,12 @@ Autostars m4 macro for versioning.
as-version.m4 as-version.m4
From liboil:
Check if unaligned memory access works correctly.
as-unaligned-access.m4
From OpenWrt: From OpenWrt:
Always disable GTK docs. Always disable GTK docs.

41
tools/missing-macros/src/m4/as-unaligned-access.m4 Normal file
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@ -0,0 +1,41 @@
dnl AS_UNALIGNED_ACCESS
dnl check if unaligned memory access works correctly
AC_DEFUN([AS_UNALIGNED_ACCESS], [
AC_MSG_CHECKING([if unaligned memory access works correctly])
if test x"$as_cv_unaligned_access" = x ; then
case $host in
alpha*|arm*|hp*|mips*|sh*|sparc*|ia64*)
_AS_ECHO_N([(blacklisted) ])
as_cv_unaligned_access=no
;;
i?86*|x86_64|amd64|powerpc*|m68k*|cris*)
_AS_ECHO_N([(whitelisted) ])
as_cv_unaligned_access=yes
;;
esac
else
_AS_ECHO_N([(cached) ])
fi
if test x"$as_cv_unaligned_access" = x ; then
AC_TRY_RUN([
int main(int argc, char **argv)
{
char array[] = "ABCDEFGH";
unsigned int iarray[2];
memcpy(iarray,array,8);
#define GET(x) (*(unsigned int *)((char *)iarray + (x)))
if(GET(0) != 0x41424344 && GET(0) != 0x44434241) return 1;
if(GET(1) != 0x42434445 && GET(1) != 0x45444342) return 1;
if(GET(2) != 0x43444546 && GET(2) != 0x46454443) return 1;
if(GET(3) != 0x44454647 && GET(3) != 0x47464544) return 1;
return 0;
}
], as_cv_unaligned_access="yes", as_cv_unaligned_access="no")
fi
AC_MSG_RESULT($as_cv_unaligned_access)
if test "$as_cv_unaligned_access" = "yes"; then
AC_DEFINE_UNQUOTED(HAVE_UNALIGNED_ACCESS, 1,
[defined if unaligned memory access works correctly])
fi
])