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[metaconfig.git] / U / modified / d_attribut.U
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1?RCS: $Id: d_attribut.U,v 3.0.1.3 1995/01/30 14:33:45 ram Exp $
2?RCS:
3?RCS: Copyright (c) 1991-1993, 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 3.0.
10?RCS:
11?RCS: Original Author: Andy Dougherty <doughera@lafcol.lafayette.edu>
12?RCS:
13?RCS: $Log: d_attribut.U,v $
14?RCS: Revision 3.0.1.3 1995/01/30 14:33:45 ram
15?RCS: patch49: test C program now includes <stdio.h> (WED)
16?RCS:
17?RCS: Revision 3.0.1.2 1995/01/11 15:25:47 ram
18?RCS: patch45: fixed typo in the d_attribut variable (ADO)
19?RCS:
20?RCS: Revision 3.0.1.1 1994/10/29 16:08:55 ram
21?RCS: patch36: created by ADO
22?RCS:
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23?MAKE:d_attribute_format d_attribute_malloc d_attribute_nonnull \
24 d_attribute_noreturn d_attribute_pure d_attribute_unused \
25 d_attribute_warn_unused_result d_printf_format_null: \
26 Myread Oldconfig cat cc ccflags rm Setvar contains i_stdlib run
0b272666 27?MAKE: -pick add $@ %<
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28?S:d_attribute_format (d_attribut_format.U):
29?S: This variable conditionally defines HASATTRIBUTE_FORMAT, which
30?S: indicates the C compiler can check for printf-like formats.
0b272666 31?S:.
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32?S:d_printf_format_null:
33?S: This variable conditionally defines PRINTF_FORMAT_NULL_OK, which
34?S: indicates the C compiler allows printf-like formats to be null.
35?S:.
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36?S:d_attribute_malloc (d_attribute_malloc.U):
37?S: This variable conditionally defines HASATTRIBUTE_MALLOC, which
38?S: indicates the C compiler can understand functions as having
39?S: malloc-like semantics.
40?S:.
41?S:d_attribute_nonnull (d_attribute_nonnull.U):
42?S: This variable conditionally defines HASATTRIBUTE_NONNULL, which
43?S: indicates that the C compiler can know that certain arguments
44?S: must not be NULL, and will check accordingly at compile time.
45?S:.
46?S:d_attribute_noreturn (d_attribute_noreturn.U):
47?S: This variable conditionally defines HASATTRIBUTE_NORETURN, which
48?S: indicates that the C compiler can know that certain functions
49?S: are guaranteed never to return.
50?S:.
51?S:d_attribute_pure (d_attribute_pure.U):
52?S: This variable conditionally defines HASATTRIBUTE_PURE, which
53?S: indicates that the C compiler can know that certain functions
54?S: are "pure" functions, meaning that they have no side effects, and
55?S: only rely on function input and/or global data for their results.
56?S:.
57?S:d_attribute_unused (d_attribute_unused.U):
58?S: This variable conditionally defines HASATTRIBUTE_UNUSED, which
59?S: indicates that the C compiler can know that certain variables
60?S: and arguments may not always be used, and to not throw warnings
61?S: if they don't get used.
62?S:.
63?S:d_attribute_warn_unused_result (d_attribute_warn_unused_result.U):
64?S: This variable conditionally defines
65?S: HASATTRIBUTE_WARN_UNUSED_RESULT, which indicates that the C
66?S: compiler can know that certain functions have a return values
67?S: that must not be ignored, such as malloc() or open().
68?S:.
69?C:HASATTRIBUTE_FORMAT ~ %< (GNUC_ATTRIBUTE_CHECK):
70?C: Can we handle GCC attribute for checking printf-style formats
71?C:.
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72?C:PRINTF_FORMAT_NULL_OK:
73?C: Allows __printf__ format to be null when checking printf-style
74?C:.
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75?C:HASATTRIBUTE_MALLOC:
76?C: Can we handle GCC attribute for malloc-style functions.
77?C:.
78?C:HASATTRIBUTE_NONNULL:
79?C: Can we handle GCC attribute for nonnull function parms.
80?C:.
81?C:HASATTRIBUTE_NORETURN:
82?C: Can we handle GCC attribute for functions that do not return
0b272666 83?C:.
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84?C:HASATTRIBUTE_PURE:
85?C: Can we handle GCC attribute for pure functions
86?C:.
87?C:HASATTRIBUTE_UNUSED:
88?C: Can we handle GCC attribute for unused variables and arguments
89?C:.
90?C:HASATTRIBUTE_WARN_UNUSED_RESULT ~ %< (HASATTRIBUTE):
91?C: Can we handle GCC attribute for warning on unused results
92?C:.
93?H:?%<:#$d_attribute_format HASATTRIBUTE_FORMAT /**/
c87b5532 94?H:?%<:#$d_printf_format_null PRINTF_FORMAT_NULL_OK /**/
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95?H:?%<:#$d_attribute_noreturn HASATTRIBUTE_NORETURN /**/
96?H:?%<:#$d_attribute_malloc HASATTRIBUTE_MALLOC /**/
97?H:?%<:#$d_attribute_nonnull HASATTRIBUTE_NONNULL /**/
98?H:?%<:#$d_attribute_pure HASATTRIBUTE_PURE /**/
99?H:?%<:#$d_attribute_unused HASATTRIBUTE_UNUSED /**/
100?H:?%<:#$d_attribute_warn_unused_result HASATTRIBUTE_WARN_UNUSED_RESULT /**/
0b272666 101?H:.
7ff25ab7 102?LINT:set d_attribute_format
c87b5532 103?LINT:set d_printf_format_null
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104?LINT:set d_attribute_malloc
105?LINT:set d_attribute_nonnull
106?LINT:set d_attribute_noreturn
107?LINT:set d_attribute_pure
108?LINT:set d_attribute_unused
109?LINT:set d_attribute_warn_unused_result
110: Look for GCC-style attribute format
111case "$d_attribute_format" in
112'')
113echo " "
114echo "Checking whether your compiler can handle __attribute__((format)) ..." >&4
115$cat >attrib.c <<'EOCP'
116#include <stdio.h>
117void my_special_printf(char* pat,...) __attribute__((__format__(__printf__,1,2)));
118EOCP
119if $cc $ccflags -c attrib.c >attrib.out 2>&1 ; then
120 if $contains 'warning' attrib.out >/dev/null 2>&1; then
121 echo "Your C compiler doesn't support __attribute__((format))."
122 val="$undef"
123 else
124 echo "Your C compiler supports __attribute__((format))."
125 val="$define"
126 fi
127else
128 echo "Your C compiler doesn't seem to understand __attribute__ at all."
129 val="$undef"
130fi
131;;
132*) val="$d_attribute_format" ;;
133esac
134set d_attribute_format
135eval $setvar
136$rm -f attrib*
137
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138: Look for GCC-style attribute format with null format allowed
139case "$d_printf_format_null" in
140'') case "$d_attribute_format" in
141 $define)
142 echo " "
143 echo "Checking whether your compiler allows __printf__ format to be null ..." >&4
144$cat >attrib.c <<EOCP
145#include <stdio.h>
146#$i_stdlib I_STDLIB
147#ifdef I_STDLIB
148#include <stdlib.h>
149#endif
150int null_printf (char* pat,...) __attribute__((__format__(__printf__,1,2)));
151int null_printf (char* pat,...) { return (int)pat; }
152int main () { exit(null_printf(NULL)); }
153EOCP
154 if $cc $ccflags -o attrib attrib.c >attrib.out 2>&1 ; then
155 : run the executable in case it produces a run-time warning
156 if $run ./attrib >>attrib.out 2>&1; then
157 if $contains 'warning' attrib.out >/dev/null 2>&1; then
158 echo "Your C compiler doesn't allow __printf__ format to be null."
159 val="$undef"
160 else
161 echo "Your C compiler allows __printf__ format to be null."
162 val="$define"
163 fi
164 else
165 echo "Your C compiler executable failed with __printf__ format null."
166 val="$undef"
167 fi
168 else
169 echo "Your C compiler fails with __printf__ format null."
170 val="$undef"
171 fi
172 ;;
173 *) val="$undef" ;;
174 esac
175;;
176*) val="$d_printf_format_null" ;;
177esac
178set d_printf_format_null
179eval $setvar
180$rm -f attrib*
181
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182: Look for GCC-style attribute malloc
183case "$d_attribute_malloc" in
184'')
185echo " "
186echo "Checking whether your compiler can handle __attribute__((malloc)) ..." >&4
187$cat >attrib.c <<'EOCP'
188#include <stdio.h>
189char *go_get_some_memory( int how_many_bytes ) __attribute__((malloc));
190EOCP
191if $cc $ccflags -c attrib.c >attrib.out 2>&1 ; then
192 if $contains 'warning' attrib.out >/dev/null 2>&1; then
193 echo "Your C compiler doesn't support __attribute__((malloc))."
194 val="$undef"
195 else
196 echo "Your C compiler supports __attribute__((malloc))."
197 val="$define"
198 fi
199else
200 echo "Your C compiler doesn't seem to understand __attribute__ at all."
201 val="$undef"
202fi
203;;
204*) val="$d_attribute_malloc" ;;
205esac
206set d_attribute_malloc
207eval $setvar
208$rm -f attrib*
209
210: Look for GCC-style attribute nonnull
211case "$d_attribute_nonnull" in
212'')
213echo " "
214echo "Checking whether your compiler can handle __attribute__((nonnull(1))) ..." >&4
215$cat >attrib.c <<'EOCP'
216#include <stdio.h>
217void do_something (char *some_pointer,...) __attribute__((nonnull(1)));
218EOCP
219if $cc $ccflags -c attrib.c >attrib.out 2>&1 ; then
220 if $contains 'warning' attrib.out >/dev/null 2>&1; then
221 echo "Your C compiler doesn't support __attribute__((nonnull))."
222 val="$undef"
223 else
224 echo "Your C compiler supports __attribute__((nonnull))."
225 val="$define"
226 fi
227else
228 echo "Your C compiler doesn't seem to understand __attribute__ at all."
229 val="$undef"
230fi
231;;
232*) val="$d_attribute_nonnull" ;;
233esac
234set d_attribute_nonnull
235eval $setvar
236$rm -f attrib*
237
238: Look for GCC-style attribute noreturn
239case "$d_attribute_noreturn" in
240'')
241echo " "
242echo "Checking whether your compiler can handle __attribute__((noreturn)) ..." >&4
243$cat >attrib.c <<'EOCP'
244#include <stdio.h>
245void fall_over_dead( void ) __attribute__((noreturn));
246EOCP
247if $cc $ccflags -c attrib.c >attrib.out 2>&1 ; then
248 if $contains 'warning' attrib.out >/dev/null 2>&1; then
249 echo "Your C compiler doesn't support __attribute__((noreturn))."
250 val="$undef"
251 else
252 echo "Your C compiler supports __attribute__((noreturn))."
253 val="$define"
254 fi
255else
256 echo "Your C compiler doesn't seem to understand __attribute__ at all."
257 val="$undef"
258fi
259;;
260*) val="$d_attribute_noreturn" ;;
261esac
262set d_attribute_noreturn
263eval $setvar
264$rm -f attrib*
265
266: Look for GCC-style attribute pure
267case "$d_attribute_pure" in
268'')
269echo " "
270echo "Checking whether your compiler can handle __attribute__((pure)) ..." >&4
271$cat >attrib.c <<'EOCP'
272#include <stdio.h>
273int square( int n ) __attribute__((pure));
274EOCP
275if $cc $ccflags -c attrib.c >attrib.out 2>&1 ; then
276 if $contains 'warning' attrib.out >/dev/null 2>&1; then
277 echo "Your C compiler doesn't support __attribute__((pure))."
278 val="$undef"
279 else
280 echo "Your C compiler supports __attribute__((pure))."
281 val="$define"
282 fi
283else
284 echo "Your C compiler doesn't seem to understand __attribute__ at all."
285 val="$undef"
286fi
287;;
288*) val="$d_attribute_pure" ;;
289esac
290set d_attribute_pure
291eval $setvar
292$rm -f attrib*
293
294: Look for GCC-style attribute unused
295case "$d_attribute_unused" in
296'')
297echo " "
298echo "Checking whether your compiler can handle __attribute__((unused)) ..." >&4
299$cat >attrib.c <<'EOCP'
300#include <stdio.h>
301int do_something( int dummy __attribute__((unused)), int n );
302EOCP
303if $cc $ccflags -c attrib.c >attrib.out 2>&1 ; then
304 if $contains 'warning' attrib.out >/dev/null 2>&1; then
305 echo "Your C compiler doesn't support __attribute__((unused))."
306 val="$undef"
307 else
308 echo "Your C compiler supports __attribute__((unused))."
309 val="$define"
310 fi
311else
312 echo "Your C compiler doesn't seem to understand __attribute__ at all."
313 val="$undef"
314fi
315;;
316*) val="$d_attribute_unused" ;;
317esac
318set d_attribute_unused
319eval $setvar
320$rm -f attrib*
321
322: Look for GCC-style attribute warn_unused_result
323case "$d_attribute_warn_unused_result" in
cdbedeff 324'')
0b272666 325echo " "
7ff25ab7 326echo "Checking whether your compiler can handle __attribute__((warn_unused_result)) ..." >&4
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327$cat >attrib.c <<'EOCP'
328#include <stdio.h>
7ff25ab7 329int I_will_not_be_ignored(void) __attribute__((warn_unused_result));
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330EOCP
331if $cc $ccflags -c attrib.c >attrib.out 2>&1 ; then
332 if $contains 'warning' attrib.out >/dev/null 2>&1; then
7ff25ab7 333 echo "Your C compiler doesn't support __attribute__((warn_unused_result))."
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334 val="$undef"
335 else
7ff25ab7 336 echo "Your C compiler supports __attribute__((warn_unused_result))."
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337 val="$define"
338 fi
339else
340 echo "Your C compiler doesn't seem to understand __attribute__ at all."
341 val="$undef"
342fi
cdbedeff 343;;
7ff25ab7 344*) val="$d_attribute_warn_unused_result" ;;
cdbedeff 345esac
7ff25ab7 346set d_attribute_warn_unused_result
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347eval $setvar
348$rm -f attrib*
349