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lxdream.org :: lxdream/acinclude.m4
lxdream 0.9.1
released Jun 29
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filename acinclude.m4
changeset 1198:407659e01ef0
prev1147:e04e4af64626
next1199:62d0a21fac1c
author Nathan Keynes <nkeynes@lxdream.org>
date Fri Dec 16 10:08:45 2011 +1000 (8 years ago)
permissions -rw-r--r--
last change Add volatile qualifier to return-address frobbing - works around optimizer
bug in GCC versions after 4.2
file annotate diff log raw
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# AC_CHECK_FASTCALL([if-ok],[if-notok])
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# Test if the compiler recognizes __attribute__((regparm(3))) - we don't 
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# currently check if it actually works correctly, but probably should...
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# -----------------------
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AC_DEFUN([AC_CHECK_FASTCALL], [
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AC_MSG_CHECKING([support for fastcall calling conventions]);
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AC_RUN_IFELSE([
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  AC_LANG_SOURCE([[
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int __attribute__((regparm(3))) foo(int a, int b) { return a+b; }
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int main(int argc, char *argv[])
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{
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   return foo( 1, 2 ) == 3 ? 0 : 1;
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}]])], [ 
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   AC_MSG_RESULT([yes])
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   $1 ], [ 
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   AC_MSG_RESULT([no])
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   $2 ])
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])
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# AC_CHECK_FORCEINLINE([if-ok],[if-notok])
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# Test if the compiler recognizes __attribute__((always_inline))
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# -----------------------
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AC_DEFUN([AC_CHECK_FORCEINLINE], [
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AC_MSG_CHECKING([support for force inlining]);
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AC_COMPILE_IFELSE([
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  AC_LANG_SOURCE([[
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static int __attribute__((always_inline)) foo(int a, int b) { return a+b; }
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int main(int argc, char *argv[])
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{
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   return foo( 1, 2 ) == 3 ? 0 : 1;
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}]])], [ 
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   FORCEINLINE="__attribute__((always_inline))"
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   AC_MSG_RESULT([$FORCEINLINE])
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   $1 ], [ 
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   FORCEINLINE=""
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   AC_MSG_RESULT([no])
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   $2 ])
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])
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# AC_CHECK_FRAME_ADDRESS([if-ok],[if-notok])
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# Test if the compiler will let us modify the return address on the stack
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# via __builtin_frame_address()
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# -----------------------
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AC_DEFUN([AC_CHECK_FRAME_ADDRESS], [
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AC_MSG_CHECKING([if we have a working __builtin_frame_address()]);
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AC_RUN_IFELSE([
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  AC_LANG_SOURCE([[
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void * __attribute__((noinline)) first_arg( void *x, void *y ) { return x; }
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int __attribute__((noinline)) foo( int arg, void *exc )
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{
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    if( arg < 2 ) {
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        *(((void * volatile *)__builtin_frame_address(0))+1) = exc;
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    }
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    return 0;
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}
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int main(int argc, char *argv[])
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{
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   goto *first_arg(&&start, &&except);
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start:
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   return foo( argc, &&except ) + 1;
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except:
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   return 0;
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}]])], [ 
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   AC_MSG_RESULT([yes])
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   $1 ], [ 
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   AC_MSG_RESULT([no])
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   $2 ])
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])
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# AC_CC_VERSION([if-gcc], [if-icc],[if-other])
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# Check which C compiler we're using and branch accordingly, eg to set
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# different optimization flags. Currently recognizes gcc and icc
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# ---------------
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AC_DEFUN([AC_CC_VERSION], [
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_GCC_VERSION=`$CC --version | $SED -ne '/gcc/p'`
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_ICC_VERSION=`$CC --version | $SED -ne '/(ICC)/p'`
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AC_MSG_CHECKING([CC version])
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if test -n "$_ICC_VERSION"; then
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   AC_MSG_RESULT([ICC])
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   [ $2 ]
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elif test -n "$_GCC_VERSION"; then
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   AC_MSG_RESULT([GCC])
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   [ $1 ] 
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else 
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   AC_MSG_RESULT([Unknown])
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   [ $3 ]
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fi
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]);
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# AC_OBJC_VERSION([if-gcc],[if-other], [if-none])
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# Check which objective C compiler we're using and branch accordingly.
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AC_DEFUN([AC_OBJC_VERSION], [
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AC_MSG_CHECKING([OBJC version])
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if test -n "$OBJC"; then
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  _GOBJC_VERSION=`$OBJC --version | $SED -ne '/(GCC)/p'`
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  if test -n "$_GOBJC_VERSION"; then
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    AC_MSG_RESULT([GCC])
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    [ $1 ]
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  else 
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    AC_MSG_RESULT([Unknown])
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    [ $2 ]
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  fi
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else
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  AC_MSG_RESULT([None])
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  [ $3 ]
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fi
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]);
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# AC_HAVE_OBJC([if-present],[if-not-present])
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# Check if we have a working Objective-C compiler
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AC_DEFUN([AC_HAVE_OBJC], [
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AC_PROG_OBJC
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AC_MSG_CHECKING([for a working Objective-C compiler])
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AC_LANG_PUSH([Objective C])dnl
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_AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@interface Foo @end]], [])],
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   [AC_MSG_RESULT([yes])
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    $1 ],
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   [AC_MSG_RESULT([No])
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    $2 ]);
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AC_LANG_POP([Objective C])
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]);
.