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Diffstat (limited to 'mcon/U/cppstdin.U')
| -rw-r--r-- | mcon/U/cppstdin.U | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/mcon/U/cppstdin.U b/mcon/U/cppstdin.U new file mode 100644 index 0000000..7153ac3 --- /dev/null +++ b/mcon/U/cppstdin.U @@ -0,0 +1,235 @@ +?RCS: $Id: cppstdin.U,v 3.0.1.4 1994/10/29 16:08:34 ram Exp $ +?RCS: +?RCS: Copyright (c) 1991-1993, Raphael Manfredi +?RCS: +?RCS: You may redistribute only under the terms of the Artistic Licence, +?RCS: as specified in the README file that comes with the distribution. +?RCS: You may reuse parts of this distribution only within the terms of +?RCS: that same Artistic Licence; a copy of which may be found at the root +?RCS: of the source tree for dist 3.0. +?RCS: +?RCS: $Log: cppstdin.U,v $ +?RCS: Revision 3.0.1.4 1994/10/29 16:08:34 ram +?RCS: patch36: added ?F: line for metalint file checking +?RCS: +?RCS: Revision 3.0.1.3 1994/01/24 14:05:38 ram +?RCS: patch16: comment for CPPLAST was missing +?RCS: +?RCS: Revision 3.0.1.2 1993/12/15 08:18:58 ram +?RCS: patch15: new variables cpprun and cpplast, guaranteed wrapper-free +?RCS: patch15: cppstdin now tries to use cc, even at the cost of a wrapper +?RCS: +?RCS: Revision 3.0.1.1 1993/08/25 14:00:53 ram +?RCS: patch6: remove wrapper when not actually used +?RCS: +?RCS: Revision 3.0 1993/08/18 12:05:38 ram +?RCS: Baseline for dist 3.0 netwide release. +?RCS: +?MAKE:cppstdin cppminus cpprun cpplast: contains test Myread Oldconfig Loc \ + cpp +cc rm +?MAKE: -pick add $@ %< +?S:cppstdin: +?S: This variable contains the command which will invoke the C +?S: preprocessor on standard input and put the output to stdout. +?S: It is primarily used by other Configure units that ask about +?S: preprocessor symbols. +?S:. +?S:cppminus: +?S: This variable contains the second part of the string which will invoke +?S: the C preprocessor on the standard input and produce to standard +?S: output. This variable will have the value "-" if cppstdin needs a minus +?S: to specify standard input, otherwise the value is "". +?S:. +?S:cpprun: +?S: This variable contains the command which will invoke a C preprocessor +?S: on standard input and put the output to stdout. It is guaranteed not +?S: to be a wrapper and may be a null string if no preprocessor can be +?S: made directly available. This preprocessor might be different from the +?S: one used by the C compiler. Don't forget to append cpplast after the +?S: preprocessor options. +?S:. +?S:cpplast: +?S: This variable has the same functionality as cppminus, only it applies to +?S: cpprun and not cppstdin. +?S:. +?C:CPPSTDIN: +?C: This symbol contains the first part of the string which will invoke +?C: the C preprocessor on the standard input and produce to standard +?C: output. Typical value of "cc -E" or "/lib/cpp", but it can also +?C: call a wrapper. See CPPRUN. +?C:. +?C:CPPMINUS: +?C: This symbol contains the second part of the string which will invoke +?C: the C preprocessor on the standard input and produce to standard +?C: output. This symbol will have the value "-" if CPPSTDIN needs a minus +?C: to specify standard input, otherwise the value is "". +?C:. +?C:CPPRUN: +?C: This symbol contains the string which will invoke a C preprocessor on +?C: the standard input and produce to standard output. It needs to end +?C: with CPPLAST, after all other preprocessor flags have been specified. +?C: The main difference with CPPSTDIN is that this program will never be a +?C: pointer to a shell wrapper, i.e. it will be empty if no preprocessor is +?C: available directly to the user. Note that it may well be different from +?C: the preprocessor used to compile the C program. +?C:. +?C:CPPLAST: +?C: This symbol is intended to be used along with CPPRUN in the same manner +?C: symbol CPPMINUS is used with CPPSTDIN. It contains either "-" or "". +?C:. +?H:#define CPPSTDIN "$cppstdin" +?H:#define CPPMINUS "$cppminus" +?H:#define CPPRUN "$cpprun" +?H:#define CPPLAST "$cpplast" +?H:. +?F:cppstdin +?T:wrapper x_cpp x_minus ok +: see how we invoke the C preprocessor +echo " " +echo "Now, how can we feed standard input to your C preprocessor..." >&4 +cat <<'EOT' >testcpp.c +#define ABC abc +#define XYZ xyz +ABC.XYZ +EOT +cd .. +echo 'cat >.$$.c; '"$cc"' -E ${1+"$@"} .$$.c; rm .$$.c' >cppstdin +chmod 755 cppstdin +wrapper=`pwd`/cppstdin +ok='false' +cd UU + +?X: +?X: We'll run the cpp tests again if we don't have any valid C preprocessor +?X: yet or don't know how to proceed without a wrapper (in which case cpprun +?X: is empty and that's really annoying...) +?X: +if $test "X$cppstdin" != "X" && \ + $cppstdin $cppminus <testcpp.c >testcpp.out 2>&1 && \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 +then + echo "You used to use $cppstdin $cppminus so we'll use that again." + case "$cpprun" in + '') echo "But let's see if we can live without a wrapper..." ;; + *) + if $cpprun $cpplast <testcpp.c >testcpp.out 2>&1 && \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 + then + echo "(And we'll use $cpprun $cpplast to preprocess directly.)" + ok='true' + else + echo "(However, $cpprun $cpplast does not work, let's see...)" + fi + ;; + esac +else + case "$cppstdin" in + '') ;; + *) + echo "Good old $cppstdin $cppminus does not seem to be of any help..." + ;; + esac +fi + +if $ok; then + : nothing +elif echo 'Maybe "'"$cc"' -E" will work...'; \ + $cc -E <testcpp.c >testcpp.out 2>&1; \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then + echo "Yup, it does." + x_cpp="$cc -E" + x_minus=''; +elif echo 'Nope...maybe "'"$cc"' -E -" will work...'; \ + $cc -E - <testcpp.c >testcpp.out 2>&1; \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then + echo "Yup, it does." + x_cpp="$cc -E" + x_minus='-'; +elif echo 'Nope...maybe "'"$cc"' -P" will work...'; \ + $cc -P <testcpp.c >testcpp.out 2>&1; \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then + echo "Yipee, that works!" + x_cpp="$cc -P" + x_minus=''; +elif echo 'Nope...maybe "'"$cc"' -P -" will work...'; \ + $cc -P - <testcpp.c >testcpp.out 2>&1; \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then + echo "At long last!" + x_cpp="$cc -P" + x_minus='-'; +elif echo 'No such luck, maybe "'$cpp'" will work...'; \ + $cpp <testcpp.c >testcpp.out 2>&1; \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then + echo "It works!" + x_cpp="$cpp" + x_minus=''; +elif echo 'Nixed again...maybe "'$cpp' -" will work...'; \ + $cpp - <testcpp.c >testcpp.out 2>&1; \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then + echo "Hooray, it works! I was beginning to wonder." + x_cpp="$cpp" + x_minus='-'; +elif echo 'Uh-uh. Time to get fancy. Trying a wrapper...'; \ + $wrapper <testcpp.c >testcpp.out 2>&1; \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then + x_cpp="$wrapper" + x_minus='' + echo "Eureka!" +else + dflt='' + rp="No dice. I can't find a C preprocessor. Name one:" + . ./myread + x_cpp="$ans" + x_minus='' + $x_cpp <testcpp.c >testcpp.out 2>&1 + if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then + echo "OK, that will do." >&4 + else +echo "Sorry, I can't get that to work. Go find one and rerun Configure." >&4 + exit 1 + fi +fi + +case "$ok" in +false) + cppstdin="$x_cpp" + cppminus="$x_minus" + cpprun="$x_cpp" + cpplast="$x_minus" +?X: +?X: If /lib/cpp is used, try using a wrapper to increase our chances to have +?X: the C compiler and our $cppstdin agree on the same symbols... However, +?X: since cpprun is guaranteed not to be a wrapper, we must clear it if the +?X: only preprocessor we found was a wrapper, with all our luck... +?X: + set X $x_cpp + shift + case "$1" in + "$cpp") + echo "Perhaps can we force $cc -E using a wrapper..." + if $wrapper <testcpp.c >testcpp.out 2>&1; \ + $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 + then + echo "Yup, we can." + cppstdin="$wrapper" + cppminus=''; + else + echo "Nope, we'll have to live without it..." + fi + ;; + esac + case "$cpprun" in + "$wrapper") + cpprun='' + cpplast='' + ;; + esac + ;; +esac + +case "$cppstdin" in +"$wrapper") ;; +*) $rm -f $wrapper;; +esac +$rm -f testcpp.c testcpp.out + |