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1 # Autoconf include file defining macros related to compile-time warnings.
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2
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3 # Copyright 2004, 2005, 2007, 2009 Free Software Foundation, Inc.
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4
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5 #This file is part of GCC.
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6
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7 #GCC is free software; you can redistribute it and/or modify it under
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8 #the terms of the GNU General Public License as published by the Free
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9 #Software Foundation; either version 3, or (at your option) any later
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10 #version.
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11
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12 #GCC is distributed in the hope that it will be useful, but WITHOUT
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13 #ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 #FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 #for more details.
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16
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17 #You should have received a copy of the GNU General Public License
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18 #along with GCC; see the file COPYING3. If not see
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19 #<http://www.gnu.org/licenses/>.
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20
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21 # ACX_PROG_CC_WARNING_OPTS(WARNINGS, [VARIABLE = WARN_CFLAGS)
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22 # Sets @VARIABLE@ to the subset of the given options which the
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23 # compiler accepts.
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24 AC_DEFUN([ACX_PROG_CC_WARNING_OPTS],
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25 [AC_REQUIRE([AC_PROG_CC])dnl
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26 m4_pushdef([acx_Var], [m4_default([$2], [WARN_CFLAGS])])dnl
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27 AC_SUBST(acx_Var)dnl
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28 m4_expand_once([acx_Var=
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29 ],m4_quote(acx_Var=))dnl
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30 save_CFLAGS="$CFLAGS"
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31 for option in $1; do
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32 AS_VAR_PUSHDEF([acx_Woption], [acx_cv_prog_cc_warning_$option])
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33 AC_CACHE_CHECK([whether $CC supports $option], acx_Woption,
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34 [CFLAGS="$option"
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35 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
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36 [AS_VAR_SET(acx_Woption, yes)],
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37 [AS_VAR_SET(acx_Woption, no)])
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38 ])
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39 AS_IF([test AS_VAR_GET(acx_Woption) = yes],
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40 [acx_Var="$acx_Var${acx_Var:+ }$option"])
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41 AS_VAR_POPDEF([acx_Woption])dnl
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42 done
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43 CFLAGS="$save_CFLAGS"
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44 m4_popdef([acx_Var])dnl
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45 ])# ACX_PROG_CC_WARNING_OPTS
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46
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47 # ACX_PROG_CC_WARNING_ALMOST_PEDANTIC(WARNINGS, [VARIABLE = WARN_PEDANTIC)
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48 # Append to VARIABLE "-pedantic" + the argument, if the compiler is GCC
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49 # and accepts all of those options simultaneously, otherwise to nothing.
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50 AC_DEFUN([ACX_PROG_CC_WARNING_ALMOST_PEDANTIC],
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51 [AC_REQUIRE([AC_PROG_CC])dnl
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52 m4_pushdef([acx_Var], [m4_default([$2], [WARN_PEDANTIC])])dnl
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53 AC_SUBST(acx_Var)dnl
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54 m4_expand_once([acx_Var=
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55 ],m4_quote(acx_Var=))dnl
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56 AS_VAR_PUSHDEF([acx_Pedantic], [acx_cv_prog_cc_pedantic_$1])dnl
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57 AS_IF([test "$GCC" = yes],
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58 [AC_CACHE_CHECK([whether $CC supports -pedantic $1], acx_Pedantic,
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59 [save_CFLAGS="$CFLAGS"
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60 CFLAGS="-pedantic $1"
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61 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],
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62 [AS_VAR_SET(acx_Pedantic, yes)],
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63 [AS_VAR_SET(acx_Pedantic, no)])
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64 CFLAGS="$save_CFLAGS"])
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65 AS_IF([test AS_VAR_GET(acx_Pedantic) = yes],
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66 [acx_Var="$acx_Var${acx_Var:+ }-pedantic $1"])
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67 ])
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68 AS_VAR_POPDEF([acx_Pedantic])dnl
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69 m4_popdef([acx_Var])dnl
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70 ])# ACX_PROG_CC_WARNING_ALMOST_PEDANTIC
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71
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72 # ACX_PROG_CC_WARNINGS_ARE_ERRORS([x.y.z], [VARIABLE = WERROR])
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73 # sets @VARIABLE@ to "-Werror" if the compiler is GCC >=x.y.z, or if
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74 # --enable-werror-always was given on the command line, otherwise
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75 # to nothing.
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76 # If the argument is the word "manual" instead of a version number,
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77 # then @VARIABLE@ will be set to -Werror only if --enable-werror-always
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78 # appeared on the configure command line.
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79 AC_DEFUN([ACX_PROG_CC_WARNINGS_ARE_ERRORS],
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80 [AC_REQUIRE([AC_PROG_CC])dnl
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81 m4_pushdef([acx_Var], [m4_default([$2], [WERROR])])dnl
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82 AC_SUBST(acx_Var)dnl
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83 m4_expand_once([acx_Var=
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84 ],m4_quote(acx_Var=))dnl
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85 AC_ARG_ENABLE(werror-always,
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86 AS_HELP_STRING([--enable-werror-always],
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87 [enable -Werror despite compiler version]),
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88 [], [enable_werror_always=no])
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89 AS_IF([test $enable_werror_always = yes],
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90 [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
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91 m4_if($1, [manual],,
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92 [AS_VAR_PUSHDEF([acx_GCCvers], [acx_cv_prog_cc_gcc_$1_or_newer])dnl
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93 AC_CACHE_CHECK([whether $CC is GCC >=$1], acx_GCCvers,
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94 [set fnord `echo $1 | tr '.' ' '`
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95 shift
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96 AC_PREPROC_IFELSE(
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97 [#if __GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__ \
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98 < [$]1 * 10000 + [$]2 * 100 + [$]3
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99 #error insufficient
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100 #endif],
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101 [AS_VAR_SET(acx_GCCvers, yes)],
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102 [AS_VAR_SET(acx_GCCvers, no)])])
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103 AS_IF([test AS_VAR_GET(acx_GCCvers) = yes],
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104 [acx_Var="$acx_Var${acx_Var:+ }-Werror"])
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105 AS_VAR_POPDEF([acx_GCCvers])])
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106 m4_popdef([acx_Var])dnl
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107 ])# ACX_PROG_CC_WARNINGS_ARE_ERRORS
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