./common/autoconf/platform.m4

rev 677 : [mq]: build-zero-on-arm

*** 340,349 ****
--- 340,350 ----
          ZERO_ARCHFLAG="-m31"
          ;;
        *)
          ZERO_ARCHFLAG="-m${OPENJDK_TARGET_CPU_BITS}"
      esac
+     PLATFORM_COMPILER_CHECK_ARGUMENTS([$ZERO_ARCHFLAG], [], [ZERO_ARCHFLAG=""])
      AC_SUBST(ZERO_ARCHFLAG)
  
      # ZERO_ARCHDEF is used to enable architecture-specific code
      case "${OPENJDK_TARGET_CPU}" in
        ppc*)    ZERO_ARCHDEF=PPC   ;;
*** 415,428 ****
--- 416,464 ----
  AC_SUBST(OS_VERSION_MAJOR)
  AC_SUBST(OS_VERSION_MINOR)
  AC_SUBST(OS_VERSION_MICRO)
  ])
  
+ # Check that the compiler supports an argument
+ # $1: the compiler argumen to check
+ # $2: action-if-true
+ # $3: action-if-false
+ AC_DEFUN([PLATFORM_COMPILER_CHECK_ARGUMENTS],
+ [
+   AC_MSG_CHECKING([if compiler supports "$1"])
+   saved_cflags="$CFLAGS"
+   CFLAGS="$1"
+   AC_COMPILE_IFELSE([
+     AC_LANG_SOURCE([
+       [int main() { return 0; }]
+     ])
+   ], [supports=yes], [supports=no])
+   CFLAGS="$saved_cflags"
+   if "x$supports" = "xyes" ; then
+     AC_MSG_RESULT([$supports])
+     $2
+   else
+     AC_MSG_RESULT([$supports])
+     $3
+   fi
+ ])
+ 
+ # Check that the compiler supports -mX flags
+ # Set COMPILER_SUPPORTS_TARGET_BITS_FLAG to 'true' if it does
+ AC_DEFUN([PLATFORM_CHECK_COMPILER_TARGET_BITS_FLAGS],
+ [
+   PLATFORM_COMPILER_CHECK_ARGUMENTS(["-m${OPENJDK_TARGET_CPU_BITS}"],
+     [COMPILER_SUPPORTS_TARGET_BITS_FLAG=true],
+     [COMPILER_SUPPORTS_TARGET_BITS_FLAG=false])
+   AC_SUBST(COMPILER_SUPPORTS_TARGET_BITS_FLAG)
+ ])
+ 
  # Support macro for PLATFORM_SETUP_OPENJDK_TARGET_BITS.
  # Add -mX to various FLAGS variables.
  AC_DEFUN([PLATFORM_SET_COMPILER_TARGET_BITS_FLAGS],
  [
+ 
    # keep track of c/cxx flags that we added outselves...
    #   to prevent emitting warning...
    ADDED_CFLAGS=" -m${OPENJDK_TARGET_CPU_BITS}"
    ADDED_CXXFLAGS=" -m${OPENJDK_TARGET_CPU_BITS}"
    ADDED_LDFLAGS=" -m${OPENJDK_TARGET_CPU_BITS}"
*** 442,451 ****
--- 478,490 ----
  #
  # Now we check if libjvm.so will use 32 or 64 bit pointers for the C/C++ code.
  # (The JVM can use 32 or 64 bit Java pointers but that decision
  # is made at runtime.)
  #
+ 
+ PLATFORM_CHECK_COMPILER_TARGET_BITS_FLAGS
+ 
  if test "x$OPENJDK_TARGET_OS" = xsolaris; then
    # Always specify -m flags on Solaris
    PLATFORM_SET_COMPILER_TARGET_BITS_FLAGS
  elif test "x$COMPILE_TYPE" = xreduced; then
    if test "x$OPENJDK_TARGET_OS" != xwindows; then