sysdeps/unix/sysv/linux/mips/configure.ac

   1 sinclude(./aclocal.m4)dnl Autoconf lossage
   2 GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
   3 # Local configure fragment for sysdeps/unix/sysv/linux/mips.
   4
   5 AC_COMPILE_IFELSE(
   6   [AC_LANG_PROGRAM([
   7     #if (_MIPS_SIM != _ABIO32)
   8     #error Not O32 ABI
   9     #endif])],
  10   [libc_mips_abi=o32],
  11   [AC_COMPILE_IFELSE(
  12     [AC_LANG_PROGRAM([
  13       #if (_MIPS_SIM != _ABIN32)
  14       #error Not N32 ABI
  15       #endif])],
  16     [libc_mips_abi=n32],
  17     [AC_COMPILE_IFELSE(
  18       [AC_LANG_PROGRAM([
  19         #if (_MIPS_SIM != _ABI64)
  20         #error Not 64 ABI
  21         #endif])],
  22       [libc_mips_abi=n64],
  23       [])])])
  24
  25 if test -z "$libc_mips_abi"; then
  26   AC_MSG_ERROR([could not determine what ABI the compiler is using])
  27 fi
  28
  29 AC_COMPILE_IFELSE(
  30   [AC_LANG_PROGRAM([
  31     #if !defined(__mips_soft_float)
  32     #error Not soft ABI
  33     #endif])],
  34   [libc_mips_float=soft],
  35   [AC_COMPILE_IFELSE(
  36     [AC_LANG_PROGRAM([
  37       #if !defined(__mips_hard_float)
  38       #error Not hard ABI
  39       #endif])],
  40     [libc_mips_float=hard],
  41     [])])
  42
  43 if test -z "$libc_mips_float"; then
  44   AC_MSG_ERROR([could not determine if compiler is using hard or soft floating point ABI])
  45 fi
  46
  47 libc_mips_o32_fp=
  48 libc_cv_mips_fp64=
  49 libc_cv_mips_modd_spreg=
  50
  51 if test x"$libc_mips_abi" = xo32 -a x"$libc_mips_float" = xhard; then
  52   AC_COMPILE_IFELSE(
  53     [AC_LANG_PROGRAM([
  54       #if !defined(__mips_fpr)
  55       #error Missing FPR sizes
  56       #endif])],
  57     [AC_COMPILE_IFELSE(
  58       [AC_LANG_PROGRAM([
  59         #if (__mips_fpr != 32)
  60         #error Not FP32
  61         #endif])],
  62       [libc_mips_o32_fp=32],
  63       [AC_COMPILE_IFELSE(
  64         [AC_LANG_PROGRAM([
  65           #if (__mips_fpr != 0) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
  66           #error Not FPXX (without odd single-precision registers)
  67           #endif])],
  68         [libc_mips_o32_fp=xx],
  69         [AC_COMPILE_IFELSE(
  70           [AC_LANG_PROGRAM([
  71             #if (__mips_fpr != 0)
  72             #error Not FPXX (with odd single precision registers)
  73             #endif])],
  74           [libc_mips_o32_fp=xxo],
  75           [AC_COMPILE_IFELSE(
  76             [AC_LANG_PROGRAM([
  77               #if (__mips_fpr != 64) || !defined(_MIPS_SPFPSET) || (_MIPS_SPFPSET != 16)
  78               #error Not FP64A
  79               #endif])],
  80             [libc_mips_o32_fp=64a],
  81             [AC_COMPILE_IFELSE(
  82               [AC_LANG_PROGRAM([
  83                 #if (__mips_fpr != 64)
  84                 #error Not FP64
  85                 #endif])],
  86               [libc_mips_o32_fp=64],
  87               [])])])])])],
  88     [])
  89
  90   LIBC_TRY_CC_OPTION([-mfp64], [libc_cv_mips_fp64=yes], [libc_cv_mips_fp64=no])
  91   LIBC_TRY_CC_OPTION([-Werror -modd-spreg], [libc_cv_mips_modd_spreg=yes], [libc_cv_mips_modd_spreg=no])
  92 fi
  93 LIBC_CONFIG_VAR([o32-fpabi],[${libc_mips_o32_fp}])
  94 LIBC_CONFIG_VAR([has-mpf64],[${libc_cv_mips_fp64}])
  95 LIBC_CONFIG_VAR([has-modd-spreg],[${libc_cv_mips_modd_spreg}])
  96
  97 AC_COMPILE_IFELSE(
  98   [AC_LANG_PROGRAM([
  99     #include <linux/prctl.h>
 100     #if !defined(PR_GET_FP_MODE) || !defined(PR_SET_FP_MODE)
 101     #error New prctl support for setting FP modes not found
 102     #endif])],
 103   [libc_mips_mode_switch=yes],
 104   [libc_mips_mode_switch=no])
 105 LIBC_CONFIG_VAR([mips-mode-switch],[${libc_mips_mode_switch}])
 106
 107 AC_CACHE_CHECK([whether the compiler is using the 2008 NaN encoding],
 108   libc_cv_mips_nan2008, [AC_EGREP_CPP(yes, [dnl
 109 #ifdef __mips_nan2008
 110 yes
 111 #endif], libc_cv_mips_nan2008=yes, libc_cv_mips_nan2008=no)])
 112
 113 libc_mips_nan=
 114 if test x"$libc_cv_mips_nan2008" = xyes; then
 115   libc_mips_nan=_2008
 116 fi
 117
 118 LIBC_CONFIG_VAR([default-abi],
 119   [${libc_mips_abi}_${libc_mips_float}${libc_mips_nan}])
 120
 121 case $machine in
 122 mips/mips64/n64/*)
 123   LIBC_SLIBDIR_RTLDDIR([lib64], [lib64])
 124   ;;
 125 mips/mips64/n32/*)
 126   LIBC_SLIBDIR_RTLDDIR([lib32], [lib32])
 127   ;;
 128 esac
 129
 130 libc_cv_gcc_unwind_find_fde=yes
 131
 132 if test -z "$arch_minimum_kernel"; then
 133   if test x$libc_cv_mips_nan2008 = xyes; then
 134     arch_minimum_kernel=4.5.0
 135   fi
 136 fi
 137
 138 # Check if we are supposed to run on kernels older than 4.8.0. If so,
 139 # force executable stack to avoid potential runtime problems with fpu
 140 # emulation.
 141 # NOTE: The check below assumes that in absence of user-provided minimum_kernel
 142 # we will default to arch_minimum_kernel which is currently less than 4.8.0 for
 143 # all known configurations. If this changes, the check must be updated.
 144 AC_CACHE_CHECK([whether the compiler must use executable stack],
 145         libc_cv_mips_force_execstack, [dnl
 146 libc_cv_mips_force_execstack=no
 147   if test $libc_mips_float = hard; then
 148     if test -n "$minimum_kernel"; then
 149        changequote(,)
 150        min_version=$((`echo "$minimum_kernel.0.0.0" | sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\).*/\1 \* 65536 + \2 \* 256 + \3/'`))
 151        changequote([,])
 152        if test $min_version -lt 264192; then
 153          libc_cv_mips_force_execstack=yes
 154        fi
 155     else
 156       libc_cv_mips_force_execstack=yes
 157     fi
 158   fi])
 159
 160 libc_mips_has_gnustack=$libc_cv_as_noexecstack
 161
 162 if test $libc_cv_mips_force_execstack = yes; then
 163   libc_mips_has_gnustack=no
 164   AC_MSG_WARN([forcing executable stack for pre-4.8.0 Linux kernels])
 165 fi
 166
 167 LIBC_CONFIG_VAR([mips-force-execstack],[${libc_cv_mips_force_execstack}])
 168 LIBC_CONFIG_VAR([mips-has-gnustack],[${libc_mips_has_gnustack}])