1 ?RCS: $Id: cppstdin.U 1 2006-08-24 12:32:52Z rmanfredi $
3 ?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi
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.
11 ?RCS: $Log: cppstdin.U,v $
12 ?RCS: Revision 3.0.1.4 1994/10/29 16:08:34 ram
13 ?RCS: patch36: added ?F: line for metalint file checking
15 ?RCS: Revision 3.0.1.3 1994/01/24 14:05:38 ram
16 ?RCS: patch16: comment for CPPLAST was missing
18 ?RCS: Revision 3.0.1.2 1993/12/15 08:18:58 ram
19 ?RCS: patch15: new variables cpprun and cpplast, guaranteed wrapper-free
20 ?RCS: patch15: cppstdin now tries to use cc, even at the cost of a wrapper
22 ?RCS: Revision 3.0.1.1 1993/08/25 14:00:53 ram
23 ?RCS: patch6: remove wrapper when not actually used
25 ?RCS: Revision 3.0 1993/08/18 12:05:38 ram
26 ?RCS: Baseline for dist 3.0 netwide release.
28 ?MAKE:cppstdin cppminus cpprun cpplast: contains test Myread Oldconfig Loc \
29 cpp +cc rm hint osname gccversion startsh eunicefix
30 ?MAKE: -pick add $@ %<
32 ?S: This variable contains the command which will invoke the C
33 ?S: preprocessor on standard input and put the output to stdout.
34 ?S: It is primarily used by other Configure units that ask about
35 ?S: preprocessor symbols.
38 ?S: This variable contains the second part of the string which will invoke
39 ?S: the C preprocessor on the standard input and produce to standard
40 ?S: output. This variable will have the value "-" if cppstdin needs
41 ?S: a minus to specify standard input, otherwise the value is "".
44 ?S: This variable contains the command which will invoke a C preprocessor
45 ?S: on standard input and put the output to stdout. It is guaranteed not
46 ?S: to be a wrapper and may be a null string if no preprocessor can be
47 ?S: made directly available. This preprocessor might be different from the
48 ?S: one used by the C compiler. Don't forget to append cpplast after the
49 ?S: preprocessor options.
52 ?S: This variable has the same functionality as cppminus, only it applies to
53 ?S: cpprun and not cppstdin.
56 ?C: This symbol contains the first part of the string which will invoke
57 ?C: the C preprocessor on the standard input and produce to standard
58 ?C: output. Typical value of "cc -E" or "/lib/cpp", but it can also
59 ?C: call a wrapper. See CPPRUN.
62 ?C: This symbol contains the second part of the string which will invoke
63 ?C: the C preprocessor on the standard input and produce to standard
64 ?C: output. This symbol will have the value "-" if CPPSTDIN needs a minus
65 ?C: to specify standard input, otherwise the value is "".
68 ?C: This symbol contains the string which will invoke a C preprocessor on
69 ?C: the standard input and produce to standard output. It needs to end
70 ?C: with CPPLAST, after all other preprocessor flags have been specified.
71 ?C: The main difference with CPPSTDIN is that this program will never be a
72 ?C: pointer to a shell wrapper, i.e. it will be empty if no preprocessor is
73 ?C: available directly to the user. Note that it may well be different from
74 ?C: the preprocessor used to compile the C program.
77 ?C: This symbol is intended to be used along with CPPRUN in the same manner
78 ?C: symbol CPPMINUS is used with CPPSTDIN. It contains either "-" or "".
80 ?H:#define CPPSTDIN "$cppstdin"
81 ?H:#define CPPMINUS "$cppminus"
82 ?H:#define CPPRUN "$cpprun"
83 ?H:#define CPPLAST "$cpplast"
85 ?F:cppstdin !testcpp.out !testcpp.c
86 ?T:wrapper x_cpp x_minus ok
87 : see how we invoke the C preprocessor
89 echo "Now, how can we feed standard input to your C preprocessor..." >&4
90 cat <<'EOT' >testcpp.c
96 if $test ! -f cppstdin; then
97 echo "$startsh" >cppstdin
98 if $test "X$osname" = "Xaix" -a "X$gccversion" = X; then
99 ?X: AIX cc -E doesn't show the absolute headerfile
100 ?X: locations but we'll cheat by using the -M flag.
101 echo 'cat >.$$.c; rm -f .$$.u; '"$cc"' ${1+"$@"} -M -c .$$.c 2>/dev/null; \
103 awk '"'"'$2 ~ /\.h$/ { print "# 0 \""$2"\"" }'"'"' .$$.u; \
104 rm -f .$$.o .$$.u; '"$cc"' -E ${1+"$@"} .$$.c; rm .$$.c' >> cppstdin
106 echo 'cat >.$$.c; '"$cc"' -E ${1+"$@"} .$$.c; rm .$$.c' >>cppstdin
108 echo "Keeping your $hint cppstdin wrapper."
112 wrapper=`pwd`/cppstdin
117 ?X: We'll run the cpp tests again if we don't have any valid C preprocessor
118 ?X: yet or don't know how to proceed without a wrapper (in which case cpprun
119 ?X: is empty and that's really annoying...)
121 if $test "X$cppstdin" != "X" && \
122 $cppstdin $cppminus <testcpp.c >testcpp.out 2>&1 && \
123 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1
125 echo "You used to use $cppstdin $cppminus so we'll use that again."
127 '') echo "But let's see if we can live without a wrapper..." ;;
129 if $cpprun $cpplast <testcpp.c >testcpp.out 2>&1 && \
130 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1
132 echo "(And we'll use $cpprun $cpplast to preprocess directly.)"
135 echo "(However, $cpprun $cpplast does not work, let's see...)"
143 echo "Good old $cppstdin $cppminus does not seem to be of any help..."
150 elif echo 'Maybe "'"$cc"' -E" will work...'; \
151 $cc -E <testcpp.c >testcpp.out 2>&1; \
152 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
156 elif echo 'Nope...maybe "'"$cc"' -E -" will work...'; \
157 $cc -E - <testcpp.c >testcpp.out 2>&1; \
158 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
162 elif echo 'Nope...maybe "'"$cc"' -P" will work...'; \
163 $cc -P <testcpp.c >testcpp.out 2>&1; \
164 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
165 echo "Yipee, that works!"
168 elif echo 'Nope...maybe "'"$cc"' -P -" will work...'; \
169 $cc -P - <testcpp.c >testcpp.out 2>&1; \
170 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
174 elif echo 'No such luck, maybe "'$cpp'" will work...'; \
175 $cpp <testcpp.c >testcpp.out 2>&1; \
176 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
180 elif echo 'Nixed again...maybe "'$cpp' -" will work...'; \
181 $cpp - <testcpp.c >testcpp.out 2>&1; \
182 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
183 echo "Hooray, it works! I was beginning to wonder."
186 elif echo 'Uh-uh. Time to get fancy. Trying a wrapper...'; \
187 $wrapper <testcpp.c >testcpp.out 2>&1; \
188 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
194 rp="No dice. I can't find a C preprocessor. Name one:"
198 $x_cpp <testcpp.c >testcpp.out 2>&1
199 if $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1 ; then
200 echo "OK, that will do." >&4
202 echo "Sorry, I can't get that to work. Go find one and rerun Configure." >&4
214 ?X: If /lib/cpp is used, try using a wrapper to increase our chances to have
215 ?X: the C compiler and our $cppstdin agree on the same symbols... However,
216 ?X: since cpprun is guaranteed not to be a wrapper, we must clear it if the
217 ?X: only preprocessor we found was a wrapper, with all our luck...
223 echo "Perhaps can we force $cc -E using a wrapper..."
224 if $wrapper <testcpp.c >testcpp.out 2>&1; \
225 $contains 'abc.*xyz' testcpp.out >/dev/null 2>&1
231 echo "Nope, we'll have to live without it..."
245 "$wrapper"|'cppstdin') ;;
248 $rm -f testcpp.c testcpp.out