src/cf/linux-test5.m4

   1 dnl These options seem to only be used for the 2.4.x
   2 dnl Linux kernel build
   3 AC_DEFUN([OPENAFS_GCC_SUPPORTS_MARCH], [
   4   AC_CACHE_CHECK([if $CC accepts -march=pentium],
   5     [openafs_cv_gcc_supports_march],
   6     [save_CFLAGS="$CFLAGS"
   7      CFLAGS="-MARCH=pentium"
   8      AC_TRY_COMPILE([],
   9                     [int x;],
  10                     [openafs_cv_gcc_supports_march=yes],
  11                     [openafs_cv_gcc_supports_march=no])
  12      CFLAGS="$save_CFLAGS"
  13     ])
  14   AS_IF([test x$openafs_cv_gcc_supports_march = xyes],
  15         [P5PLUS_KOPTS="-march=pentium"],
  16         [P5PLUS_KOPTS="-m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2"])
  17 ])
  18
  19 AC_DEFUN([OPENAFS_GCC_NEEDS_NO_STRICT_ALIASING], [
  20   AC_CACHE_CHECK([if $CC needs -fno-strict-aliasing],
  21     [openafs_cv_gcc_needs_no_strict_aliasing],
  22     [save_CFLAGS="$CFLAGS"
  23      CFLAGS="-fno-strict-aliasing"
  24      AC_TRY_COMPILE([],
  25                     [int x;],
  26                     [openafs_cv_gcc_needs_no_strict_aliasing=yes],
  27                     [openafs_cv_gcc_needs_no_strict_aliasing=no])
  28      CFLAGS="$save_CFLAGS"
  29   ])
  30   AS_IF([test x$openafs_cv_gcc_needs_no_strict_aliasing = xyes],
  31         [LINUX_GCC_KOPTS="$LINUX_GCC_KOPTS -fno-strict-aliasing"])
  32 ])
  33
  34 AC_DEFUN([OPENAFS_GCC_NEEDS_NO_STRENGTH_REDUCE], [
  35   AC_CACHE_CHECK([if $CC needs -fno-strength-reduce],
  36     [openafs_cv_gcc_needs_no_strength_reduce],
  37     [save_CFLAGS="$CFLAGS"
  38      CFLAGS="-fno-strength-reduce"
  39      AC_TRY_COMPILE([],
  40                     [int x;],
  41                     [openafs_cv_gcc_needs_no_strength_reduce=yes],
  42                     [openafs_cv_gcc_needs_no_strength_reduce=no])
  43      CFLAGS="$save_CFLAGS"
  44   ])
  45   AS_IF([test x$openafs_cv_gcc_needs_no_strength_reduce = xyes],
  46         [LINUX_GCC_KOPTS="$LINUX_GCC_KOPTS -fno-strength-reduce"])
  47 ])
  48
  49 AC_DEFUN([OPENAFS_GCC_SUPPORTS_NO_COMMON], [
  50   AC_CACHE_CHECK([if $CC supports -fno-common],
  51     [openafs_cv_gcc_supports_no_common],
  52     [save_CFLAGS="$CFLAGS"
  53      CFLAGS="-fno-common"
  54      AC_TRY_COMPILE([],
  55                     [int x;],
  56                     [openafs_cv_gcc_supports_no_common=yes],
  57                     [openafs_cv_gcc_supports_no_common=no])
  58
  59      CFLAGS="$save_CFLAGS"
  60   ])
  61   AS_IF([test x$openafs_cv_gcc_supports_no_common = xyes],
  62         [LINUX_GCC_KOPTS="$LINUX_GCC_KOPTS -fno-common"])
  63 ])
  64
  65 AC_DEFUN([OPENAFS_GCC_SUPPORTS_PIPE], [
  66   AC_CACHE_CHECK([if $CC supports -pipe],
  67     [openafs_cv_gcc_supports_pipe],
  68     [save_CFLAGS="$CFLAGS"
  69      CFLAGS="-pipe"
  70      AC_TRY_COMPILE([],
  71                     [int x;],
  72                     [openafs_cv_gcc_supports_pipe=yes],
  73                     [openafs_cv_gcc_supports_pipe=no])
  74   CFLAGS="$save_CFLAGS"
  75   ])
  76   AS_IF([test x$openafs_cv_gcc_supports_pipe = xyes],
  77           [LINUX_GCC_KOPTS="$LINUX_GCC_KOPTS -pipe"])
  78 ])