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_COMPILE_IFELSE(
   9        [AC_LANG_PROGRAM(
  10          [[]],
  11          [[int x;]])],
  12          [openafs_cv_gcc_supports_march=yes],
  13          [openafs_cv_gcc_supports_march=no])
  14      CFLAGS="$save_CFLAGS"
  15     ])
  16   AS_IF([test x$openafs_cv_gcc_supports_march = xyes],
  17         [P5PLUS_KOPTS="-march=pentium"],
  18         [P5PLUS_KOPTS="-m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2"])
  19 ])
  20
  21 AC_DEFUN([OPENAFS_GCC_NEEDS_NO_STRICT_ALIASING], [
  22   AC_CACHE_CHECK([if $CC needs -fno-strict-aliasing],
  23     [openafs_cv_gcc_needs_no_strict_aliasing],
  24     [save_CFLAGS="$CFLAGS"
  25      CFLAGS="-fno-strict-aliasing"
  26      AC_COMPILE_IFELSE(
  27        [AC_LANG_PROGRAM(
  28          [[]],
  29          [[int x;]])],
  30        [openafs_cv_gcc_needs_no_strict_aliasing=yes],
  31        [openafs_cv_gcc_needs_no_strict_aliasing=no])
  32      CFLAGS="$save_CFLAGS"
  33   ])
  34   AS_IF([test x$openafs_cv_gcc_needs_no_strict_aliasing = xyes],
  35         [LINUX_GCC_KOPTS="$LINUX_GCC_KOPTS -fno-strict-aliasing"])
  36 ])
  37
  38 AC_DEFUN([OPENAFS_GCC_NEEDS_NO_STRENGTH_REDUCE], [
  39   AC_CACHE_CHECK([if $CC needs -fno-strength-reduce],
  40     [openafs_cv_gcc_needs_no_strength_reduce],
  41     [save_CFLAGS="$CFLAGS"
  42      CFLAGS="-fno-strength-reduce"
  43      AC_COMPILE_IFELSE(
  44        [AC_LANG_PROGRAM(
  45          [[]],
  46          [[int x;]])],
  47        [openafs_cv_gcc_needs_no_strength_reduce=yes],
  48        [openafs_cv_gcc_needs_no_strength_reduce=no])
  49      CFLAGS="$save_CFLAGS"
  50   ])
  51   AS_IF([test x$openafs_cv_gcc_needs_no_strength_reduce = xyes],
  52         [LINUX_GCC_KOPTS="$LINUX_GCC_KOPTS -fno-strength-reduce"])
  53 ])
  54
  55 AC_DEFUN([OPENAFS_GCC_SUPPORTS_NO_COMMON], [
  56   AC_CACHE_CHECK([if $CC supports -fno-common],
  57     [openafs_cv_gcc_supports_no_common],
  58     [save_CFLAGS="$CFLAGS"
  59      CFLAGS="-fno-common"
  60      AC_COMPILE_IFELSE(
  61        [AC_LANG_PROGRAM(
  62          [[]],
  63          [[int x;]])],
  64        [openafs_cv_gcc_supports_no_common=yes],
  65        [openafs_cv_gcc_supports_no_common=no])
  66
  67      CFLAGS="$save_CFLAGS"
  68   ])
  69   AS_IF([test x$openafs_cv_gcc_supports_no_common = xyes],
  70         [LINUX_GCC_KOPTS="$LINUX_GCC_KOPTS -fno-common"])
  71 ])
  72
  73 AC_DEFUN([OPENAFS_GCC_SUPPORTS_PIPE], [
  74   AC_CACHE_CHECK([if $CC supports -pipe],
  75     [openafs_cv_gcc_supports_pipe],
  76     [save_CFLAGS="$CFLAGS"
  77      CFLAGS="-pipe"
  78      AC_COMPILE_IFELSE(
  79        [AC_LANG_PROGRAM(
  80          [[]],
  81          [[int x;]])],
  82        [openafs_cv_gcc_supports_pipe=yes],
  83        [openafs_cv_gcc_supports_pipe=no])
  84   CFLAGS="$save_CFLAGS"
  85   ])
  86   AS_IF([test x$openafs_cv_gcc_supports_pipe = xyes],
  87           [LINUX_GCC_KOPTS="$LINUX_GCC_KOPTS -pipe"])
  88 ])
  89
  90 AC_DEFUN([OPENAFS_GCC_SUPPORTS_WNO_ERROR_FRAME_LARGER_THAN], [
  91   AC_CACHE_CHECK([if $CC supports -Wno-error=frame-larger-than=],
  92     [openafs_cv_gcc_supports_wno_error_frame_larger_than],
  93     [save_CFLAGS="$CFLAGS"
  94      CFLAGS="-Wno-error=frame-larger-than="
  95      AC_COMPILE_IFELSE(
  96        [AC_LANG_PROGRAM(
  97          [[]],
  98          [[int x;]])],
  99        [openafs_cv_gcc_supports_wno_error_frame_larger_than=yes],
 100        [openafs_cv_gcc_supports_wno_error_frame_larger_than=no])
 101   CFLAGS="$save_CFLAGS"
 102   ])
 103   AS_IF([test x$openafs_cv_gcc_supports_wno_error_frame_larger_than = xyes && test x"$CFLAGS_NOERROR" != x],
 104         dnl Only use -Wno-error=frame-larger-than= if gcc supports it, and if
 105         dnl CFLAGS_NOERROR is nonempty (so if --enable-checking=all is used, we
 106         dnl don't pass -Wno-error=frame-larger-than=)
 107         [CFLAGS_WNOERROR_FRAME_LARGER_THAN="-Wno-error=frame-larger-than="])
 108   AC_SUBST([CFLAGS_WNOERROR_FRAME_LARGER_THAN])
 109 ])