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1 #! /bin/sh
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2 #
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3 # Check that the warning flags documented in invoke.texi match up
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4 # with what the compiler accepts.
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5 #
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6 # Copyright (C) 2008, 2009 Free Software Foundation, Inc.
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7 # Written by Ralf Wildenhues <Ralf.Wildenhues@gmx.de>.
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8 #
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9 # This script is Free Software, and it can be copied, distributed and
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10 # modified as defined in the GNU General Public License. A copy of
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11 # its license can be downloaded from http://www.gnu.org/copyleft/gpl.html
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12 #
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13 # Call this script as
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14 # check_warning_flags.sh path/to/invoke.texi
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15 # with CC set to the compiler to be tested.
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16 # The script scribbles in the current directory.
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17
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18 progname=`echo "$0" | sed 's,.*/,,'`
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19 usage ()
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20 {
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21 echo "usage: $progname path/to/gcc/doc"
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22 echo "set \$CC to the compiler to be checked"
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23 exit 1
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24 }
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25
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26 ret=0
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27 LC_ALL=C
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28 export LC_ALL
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29 : ${CC=gcc}
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30 test $# = 1 || usage
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31 gcc_docdir=$1
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32 invoke_texi=$gcc_docdir/invoke.texi
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33 test -r "$invoke_texi" || {
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34 echo "$progname: error: cannot read '$invoke_texi'" >&2
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35 usage
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36 }
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37 filebase=check_warning_flags_file$$
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38 stderr=check_warning_flags_stderr$$
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39
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40 remove_problematic_flags='
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41 /-Wlarger-than-/d
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42 /-Wframe-larger-than/d
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43 /-Wdisallowed-function-list/d
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44 /-W[alp],/d
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45 /-Werror/d
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46 /-Wpadded/d
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47 /pedantic-ms-format/d
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48 /=/d'
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49
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50 # Ensure that indexed warnings are accepted.
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51 set x `sed '/^@opindex W/{
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52 s/^@opindex /-/
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53 '"$remove_problematic_flags"'
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54 /-W[alp]$/d
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55 p
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56 }
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57 d' <"$invoke_texi"`
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58 shift
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59 : >$filebase.c
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60 $CC -c $filebase.c "$@" 2>&1 |
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61 grep -v 'command line option.*is valid for.*but not for' >$stderr
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62 if test -s $stderr; then
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63 echo "options listed in @opindex but not accepted by the compiler:" >&2
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64 cat $stderr >&2
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65 ret=1
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66 fi
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67 rm -f $filebase.c $stderr
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68
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69 # Check documentation of warning options.
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70 for lang in c c++ objc obj-c++; do
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71 case $lang in
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72 c) ext=c; langmatch='[^-]C[^+].*only' ;;
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73 c++) ext=C; langmatch='[^-]C++.*only' ;;
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74 objc) ext=m; langmatch='Objective-C[^+].*only' ;;
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75 obj-c++) ext=M; langmatch='Objective-C++.*only' ;;
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76 esac
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77 file=$filebase.$ext
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78 : >$file
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79 $CC -c $file 2>$stderr
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80 if grep 'not installed on this system' $stderr >/dev/null ||
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81 grep 'installation problem, cannot exec' $stderr >/dev/null ||
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82 grep 'error trying to exec' $stderr >/dev/null
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83 then
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84 echo "$progname: $CC is not configured for language $lang, skipping checks" >&2
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85 rm -f $file $filebase.o $filebase.obj $stderr
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86 continue
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87 fi
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88
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89 # Verify good warning flags.
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90 set x `sed '
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91 t a
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92 :a
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93 /^@item -W/{
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94 /'"$langmatch"'/b x
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95 / only)/d
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96 b x
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97 }
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98 d
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99 :x
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100 '"$remove_problematic_flags"'
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101 s/^@item //
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102 s/ .*//
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103 ' <"$invoke_texi"`
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104 shift
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105 $CC -c $file -O "$@" 2>$stderr
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106 if test -s $stderr; then
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107 echo failures: >&2
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108 cat $stderr >&2
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109 ret=1
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110 fi
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111
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112 # Verify bad warning flags.
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113 set x `sed '
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114 t a
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115 :a
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116 /^@item -W/{
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117 / only)/!d
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118 /'"$langmatch"'/d
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119 b x
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120 }
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121 d
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122 :x
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123 '"$remove_problematic_flags"'
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124 s/^@item //
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125 s/ .*//
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126 ' <"$invoke_texi"`
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127 shift
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128 $CC -c $file -O "$@" 2>$stderr
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129 # cat $stderr >&2
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130 test $# = `grep 'command line option.*valid.*but not for' <$stderr | wc -l` || {
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131 for warning
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132 do
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133 grep "command line option.*$warning.*valid" <$stderr >&2 ||
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134 echo "valid for $lang but not annotated as such: $warning"
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135 done
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136 ret=1
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137 }
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138 rm -f $file $filebase.o $filebase.obj $stderr
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139 done
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140
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141
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142 remove_problematic_help_flags='
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143 /^W$/d
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144 /^W[alp]$/d
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145 /^Werror-implicit-function-declaration$/d
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146 /^Wsynth$/d
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147 /-$/d
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148 /=/d'
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149 help_flags=`
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150 $CC --help -v 2>/dev/null | tr ' ' '\n' |
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151 sed -n '
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152 b a
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153 :a
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154 s/^-\(W[^<,]*\).*/\1/
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155 t x
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156 d
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157 :x
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158 '"$remove_problematic_help_flags"'
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159 p' | sort -u`
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160 : >$filebase.c
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161 for flag in $help_flags; do
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162 $CC -c $filebase.c -$flag 2>/dev/null || {
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163 echo "warning -$flag not supported" >&2
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164 ret=1
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165 }
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166 grep "@item.*$flag" $gcc_docdir/../*/*.texi >/dev/null || {
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167 # For @item, we are satisfied with either -Wfoo or -Wno-foo.
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168 inverted_flag=`echo "$flag" | sed '
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169 s/^Wno-/W/
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170 t
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171 s/^W/Wno-/'`
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172 grep "@item.*$inverted_flag" $gcc_docdir/../*/*.texi >/dev/null || {
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173 echo "warning -$flag not documented in $gcc_docdir/../*/*.texi" >&2
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174 ret=1
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175 }
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176 }
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177 done
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178 rm -f $filebase.c $filebase.o
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179
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180 exit $ret
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