| 1 | ?RCS: $Id: cppfilecom.U 1 2006-08-24 12:32:52Z rmanfredi $ |
| 2 | ?RCS: |
| 3 | ?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi |
| 4 | ?RCS: |
| 5 | ?RCS: You may redistribute only under the terms of the Artistic Licence, |
| 6 | ?RCS: as specified in the README file that comes with the distribution. |
| 7 | ?RCS: You may reuse parts of this distribution only within the terms of |
| 8 | ?RCS: that same Artistic Licence; a copy of which may be found at the root |
| 9 | ?RCS: of the source tree for dist 4.0. |
| 10 | ?RCS: |
| 11 | ?RCS: Orginal Author: Graham Stoney <greyham@research.canon.oz.au> |
| 12 | ?RCS: |
| 13 | ?RCS: $Log: cppfilecom.U,v $ |
| 14 | ?RCS: Revision 3.0 1993/08/18 12:05:37 ram |
| 15 | ?RCS: Baseline for dist 3.0 netwide release. |
| 16 | ?RCS: |
| 17 | ?MAKE:cppfilecom cppstdinflags d_cppignhdrs d_cppcanstdin: \ |
| 18 | contains package test Myread Oldconfig Loc Setvar cpp cc cat rm |
| 19 | ?MAKE: -pick add $@ %< |
| 20 | ?S:cppfilecom: |
| 21 | ?S: This variable contains the first part of the string which will invoke |
| 22 | ?S: the C preprocessor a file and produce to standard output, preserving |
| 23 | ?S: comments. Typical value of "cc -E -C" or "/lib/cpp -C". |
| 24 | ?S:. |
| 25 | ?S:cppstdinflags: |
| 26 | ?S: This variable contains any flags necessary to get cppfilecom to read |
| 27 | ?S: from the standard input. |
| 28 | ?S:. |
| 29 | ?S:d_cppignhdrs: |
| 30 | ?S: This symbol conditionally defines CPP_IGN_HDRS if CPP_FILE_COM ignores |
| 31 | ?S: *.h files. |
| 32 | ?S:. |
| 33 | ?S:d_cppcanstdin: |
| 34 | ?S: This symbol conditionally defines CPP_CAN_STDIN if CPP_FILE_COM can |
| 35 | ?S: read standard input directly. |
| 36 | ?S:. |
| 37 | ?C:CPP_FILE_COM (CPPFILECOM): |
| 38 | ?C: This symbol contains the first part of the string which will invoke |
| 39 | ?C: the C preprocessor a file and produce to standard output, preserving |
| 40 | ?C: comments. Typical value of "cc -E -C" or "/lib/cpp -C". |
| 41 | ?C:. |
| 42 | ?C:CPP_STDIN_FLAGS (CPPSTDINFLAGS): |
| 43 | ?C: This variable contains any flags necessary to get CPP_FILE_COM to |
| 44 | ?C: read from the standard input. |
| 45 | ?C:. |
| 46 | ?C:CPP_IGN_HDRS (CPPIGNHDRS): |
| 47 | ?C: This symbol is defined if CPP_FILE_COM ignores *.h files. |
| 48 | ?C:. |
| 49 | ?C:CPP_CAN_STDIN (CPPCANSTDIN): |
| 50 | ?C: This symbol is defined if CPP_FILE_COM can read standard input |
| 51 | ?C: directly. |
| 52 | ?C:. |
| 53 | ?H:#define CPP_FILE_COM "$cppfilecom" |
| 54 | ?H:#define CPP_STDIN_FLAGS "$cppstdinflags" |
| 55 | ?H:#$d_cppignhdrs CPP_IGN_HDRS /* does CPP ignore .h files? */ |
| 56 | ?H:#$d_cppcanstdin CPP_CAN_STDIN /* can CPP read stdin directly? */ |
| 57 | ?H:. |
| 58 | ?T:cont |
| 59 | ?F:!testcpp.c !testcpp.h !testcpp.out |
| 60 | ?LINT:set d_cppcanstdin d_cppignhdrs |
| 61 | ?LINT:usefile testcpp.c testcpp.out |
| 62 | : see how we invoke the C preprocessor |
| 63 | $cat <<EOM |
| 64 | |
| 65 | $package needs to be able to preprocess its input files in a mode which |
| 66 | preserves comments, which is often not the default behaviour. It should run |
| 67 | the C preprocessor you will use when compiling your own source code, which |
| 68 | should be ISO/ANSI C compliant if you want $package to handle the latest |
| 69 | standard C. I will try to guess, but I might guess wrongly because it is not |
| 70 | necessarily the same preprocessor used to build $package. |
| 71 | |
| 72 | EOM |
| 73 | $cat <<'EOT' >testcpp.c |
| 74 | #define ABC abc |
| 75 | #define XYZ xyz |
| 76 | ABC.XYZ |
| 77 | /* comment */ |
| 78 | EOT |
| 79 | : |
| 80 | if $test "X$cppfilecom" != "X" && \ |
| 81 | $cppfilecom testcpp.c </dev/null >testcpp.out 2>/dev/null && \ |
| 82 | $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 83 | $contains comment testcpp.out >/dev/null 2>&1 |
| 84 | then |
| 85 | echo "You used to use $cppfilecom so we'll use that again." |
| 86 | elif echo 'Maybe "'$cc' -E -C" will work...' && \ |
| 87 | $cc -E -C testcpp.c </dev/null >testcpp.out 2>/dev/null && \ |
| 88 | $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 89 | $contains comment testcpp.out >/dev/null 2>&1 |
| 90 | then |
| 91 | echo "It works!" |
| 92 | cppfilecom="$cc -E -C" |
| 93 | elif echo 'Nope...maybe "'"$cc"' -P -C" will work...' && \ |
| 94 | $cc -P -C testcpp.c </dev/null >testcpp.out 2>/dev/null && \ |
| 95 | $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 96 | $contains comment testcpp.out >/dev/null 2>&1 |
| 97 | then |
| 98 | echo "Yup, that does." |
| 99 | cppfilecom="$cc -P -C" |
| 100 | elif echo 'No such luck, maybe "'"$cpp"' -C" will work...' && \ |
| 101 | $cpp -C testcpp.c </dev/null >testcpp.out 2>/dev/null && \ |
| 102 | $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 103 | $contains comment testcpp.out >/dev/null 2>&1 |
| 104 | then |
| 105 | echo "Yup, it does." |
| 106 | cppfilecom="$cpp -C" |
| 107 | else |
| 108 | cppfilecom='' |
| 109 | $cat <<'EOM' |
| 110 | I can't find a C preprocessor that will preserve comments. Please name one. |
| 111 | EOM |
| 112 | fi |
| 113 | : |
| 114 | dflt="$cppfilecom" |
| 115 | cont=true |
| 116 | while $test "$cont" ; do |
| 117 | echo " " |
| 118 | rp="How should $package run your preprocessor preserving comments?" |
| 119 | . ./myread |
| 120 | cppfilecom="$ans" |
| 121 | $cppfilecom testcpp.c >testcpp.out 2>&1 |
| 122 | if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 123 | $contains comment testcpp.out >/dev/null 2>&1 |
| 124 | then |
| 125 | echo "OK, that will do." |
| 126 | cont='' |
| 127 | else |
| 128 | echo "Sorry, I can't get that to work." |
| 129 | fi |
| 130 | done |
| 131 | |
| 132 | @if CPP_IGN_HDRS || d_cppignhdrs |
| 133 | : Now see if it ignores header files. |
| 134 | cp testcpp.c testcpp.h |
| 135 | $cppfilecom testcpp.h >testcpp.out 2>&1 |
| 136 | if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 137 | $contains comment testcpp.out >/dev/null 2>&1 |
| 138 | then |
| 139 | echo "Terrific; it processes .h files passed on the command line too." |
| 140 | val="$undef" |
| 141 | else |
| 142 | echo "It ignores .h files on the command line; pity." |
| 143 | val="$define" |
| 144 | fi |
| 145 | set d_cppignhdrs |
| 146 | eval $setvar |
| 147 | |
| 148 | @end |
| 149 | @if CPP_STDIN_FLAGS || CPP_CAN_STDIN || cppstdinflags || d_cppcanstdin |
| 150 | : Now see how to send stdin to it. |
| 151 | echo " " |
| 152 | cp testcpp.c testcpp.h |
| 153 | $cppfilecom <testcpp.h >testcpp.out 2>&1 |
| 154 | if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 155 | $contains comment testcpp.out >/dev/null 2>&1 |
| 156 | then |
| 157 | echo "Great; and it will read stdin if passed no arguments." |
| 158 | val="$define" |
| 159 | cppstdinflags='' |
| 160 | else |
| 161 | $cppfilecom - <testcpp.h >testcpp.out 2>&1 |
| 162 | if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 163 | $contains comment testcpp.out >/dev/null 2>&1 |
| 164 | then |
| 165 | echo "Great; and it can read stdin by passing it '-'." |
| 166 | val="$define" |
| 167 | cppstdinflags='-' |
| 168 | else |
| 169 | $cat <<FOO |
| 170 | Unfortunately, I can't find an easy way to get that preprocessor to read from |
| 171 | standard input. Do you know any flags I can pass it to get it to do so? |
| 172 | If that preprocessor can't read directly form standard input, answer 'none'. |
| 173 | |
| 174 | FOO |
| 175 | val='dunno' |
| 176 | while $test "$val" = "dunno"; do |
| 177 | rp='Flags to get preprocessor to read stdin?' |
| 178 | dflt='none' |
| 179 | . ./myread |
| 180 | if $test $ans = 'none'; then |
| 181 | echo "Oh well, if $package wants it done, it will do it for itself." |
| 182 | val="$undef" |
| 183 | else |
| 184 | $cppfilecom $ans <testcpp.h >testcpp.out 2>&1 |
| 185 | if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 && \ |
| 186 | $contains comment testcpp.out >/dev/null 2>&1 |
| 187 | then |
| 188 | echo "Good; that works fine." |
| 189 | val="$define" |
| 190 | cppstdinflags="$ans" |
| 191 | else |
| 192 | echo "Sorry, I couldn't get that to work." |
| 193 | fi |
| 194 | fi |
| 195 | done |
| 196 | fi |
| 197 | fi |
| 198 | set d_cppcanstdin |
| 199 | eval $setvar |
| 200 | |
| 201 | @end |
| 202 | : cleanup cpp test files anyway |
| 203 | $rm -f testcpp.* |
| 204 | |