1 # BEGIN OF GRAS ARCH CHECK
3 dnl GRAS_DO_CHECK_SIZEOF: Get the size of a datatype (even in cross-compile)
5 dnl 2: extra include lines
6 dnl 3: extra sizes to test
7 dnl ("adapted" from openldap)
9 AC_DEFUN([GRAS_DO_CHECK_SIZEOF],
10 [changequote(<<, >>)dnl
11 dnl The cache variable name (and of the result).
12 define(<<GRAS_CHECK_SIZEOF_RES>>, translit(ac_cv_sizeof_$1, [ *()], [_pLR]))dnl
14 AC_CACHE_VAL(GRAS_CHECK_SIZEOF_RES,
15 [for ac_size in 4 8 1 2 16 $3 ; do # List sizes in rough order of prevalence.
16 AC_COMPILE_IFELSE(AC_LANG_PROGRAM([#include "confdefs.h"
17 #include <sys/types.h>
19 ], [switch (0) case 0: case (sizeof ($1) == $ac_size):;]), GRAS_CHECK_SIZEOF_RES=$ac_size)
20 if test x$GRAS_CHECK_SIZEOF_RES != x ; then break; fi
26 dnl GRAS_CHECK_SIZEOF: Get the size of a datatype (even in cross-compile), with msg display, and define the result
28 dnl 2: extra include lines
29 dnl 3: extra sizes to test
30 dnl ("adapted" from openldap)
32 AC_DEFUN([GRAS_CHECK_SIZEOF],
33 [AC_MSG_CHECKING(size of $1)
34 GRAS_DO_CHECK_SIZEOF($1,$2)
35 if test x$GRAS_CHECK_SIZEOF_RES = x ; then
36 AC_MSG_ERROR([cannot determine a size for $1])
38 AC_MSG_RESULT($GRAS_CHECK_SIZEOF_RES)
42 dnl GRAS_TWO_COMPLIMENT([type]): Make sure the type is two-compliment
43 dnl warning, this does not work with char (quite logical)
45 AC_DEFUN([GRAS_TWO_COMPLIMENT],
47 AC_MSG_CHECKING(whether $1 is two-compliment)
48 AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
51 unsigned char bytes[sizeof($1)];
54 intTester.testInt = -2;
55 return ((unsigned int)intTester.bytes[0] +
56 (unsigned int)intTester.bytes[sizeof($1) - 1]) - 509; /* should be 0 */
57 ]])], dnl end of AC LANG PROGRAM
58 [two_compliment=yes],[two_compliment=no] )dnl end of AC COMPILE IFELSE
60 AC_MSG_RESULT($two_compliment)
61 if test x$two_compliment != xyes ; then
62 AC_MSG_ERROR([GRAS works only two-compliment integers (yet)])
67 dnl GRAS_SIGNED_SIZEOF: Get the size of the datatype, and make sure that
68 dnl signed, unsigned and unspecified have the same size
70 AC_DEFUN([GRAS_SIGNED_SIZEOF],
71 [AC_MSG_CHECKING(size of $1)
72 GRAS_DO_CHECK_SIZEOF($1,$2)
73 unspecif=$GRAS_CHECK_SIZEOF_RES
74 if test x$unspecif = x ; then
75 AC_MSG_ERROR([cannot determine a size for $1])
78 GRAS_DO_CHECK_SIZEOF(signed $1,$2)
79 signed=$GRAS_CHECK_SIZEOF_RES
80 if test x$signed = x ; then
81 AC_MSG_ERROR([cannot determine a size for signed $1])
83 if test x$unspecif != x$signed ; then
84 AC_MSG_ERROR(['signed $1' and '$1' have different sizes ! ($signed != $unspecif)])
87 GRAS_DO_CHECK_SIZEOF(unsigned $1,$2)
88 unsigned=$GRAS_CHECK_SIZEOF_RES
89 if test x$unsigned = x ; then
90 AC_MSG_ERROR([cannot determine a size for unsigned $1])
92 if test x$unsigned != x$signed ; then
93 AC_MSG_ERROR(['signed $1' and 'unsigned $1' have different sizes ! ($signed != $unsigned)])
96 AC_MSG_RESULT($GRAS_CHECK_SIZEOF_RES)
100 dnl End of CHECK_SIGNED_SIZEOF
103 # GRAS_STRUCT_BOUNDARY(): Check the minimal alignment boundary of $1 in structures
104 # ---------------------
105 # (using integer, I hope no arch let it change with the content)
106 AC_DEFUN([GRAS_STRUCT_BOUNDARY],
107 [changequote(<<, >>)dnl
108 dnl The cache variable name (and of the result).
109 define(<<GRAS_STRUCT_BOUNDARY_RES>>, translit(ac_cv_struct_boundary_$1, [ *()], [_pLR]))dnl
111 AC_MSG_CHECKING(for the minimal structure boundary of $1)
113 AC_CACHE_VAL(GRAS_STRUCT_BOUNDARY_RES,
114 [for ac_size in 1 2 4 8 16 32 64 ; do # List sizes in rough order of prevalence.
115 AC_COMPILE_IFELSE(AC_LANG_PROGRAM([#include "confdefs.h"
116 #include <sys/types.h>
117 struct s { char c; $1 i; };
118 ],[switch (0) case 0: case (sizeof (struct s) == $ac_size+sizeof($1)):;]), GRAS_STRUCT_BOUNDARY_RES=$ac_size)
119 if test x$GRAS_STRUCT_BOUNDARY_RES != x ; then break; fi
122 AC_MSG_RESULT($GRAS_STRUCT_BOUNDARY_RES)
123 if test x$GRAS_STRUCT_BOUNDARY_RES = x ; then
124 AC_MSG_ERROR([Cannot determine the minimal alignment boundary of $1 in structures])
128 # GRAS_ARCH(): check the gras_architecture of this plateform
130 # The different cases here must be syncronized with the array in src/base/DataDesc/ddt_convert.c
132 AC_DEFUN([GRAS_ARCH],
134 # Check for the architecture
135 AC_C_BIGENDIAN(endian=1,endian=0,AC_MSG_ERROR([GRAS works only for little or big endian systems (yet)]))
136 dnl Make sure we don't run on a non-two-compliment arch, since we dunno convert them
137 GRAS_TWO_COMPLIMENT(int)
138 AC_DEFINE_UNQUOTED(GRAS_BIGENDIAN,$endian,[define if big endian])
140 GRAS_SIGNED_SIZEOF(char) GRAS_STRUCT_BOUNDARY(char)
141 GRAS_SIGNED_SIZEOF(short int) GRAS_STRUCT_BOUNDARY(short int)
142 GRAS_SIGNED_SIZEOF(int) GRAS_STRUCT_BOUNDARY(int)
143 GRAS_SIGNED_SIZEOF(long int) GRAS_STRUCT_BOUNDARY(long int)
144 GRAS_SIGNED_SIZEOF(long long int) GRAS_STRUCT_BOUNDARY(long long int)
146 GRAS_STRUCT_BOUNDARY(float) GRAS_STRUCT_BOUNDARY(double)
148 GRAS_CHECK_SIZEOF(void *) GRAS_STRUCT_BOUNDARY(void *)
149 GRAS_CHECK_SIZEOF(void (*) (void))
152 AC_MSG_CHECKING(the GRAS signature of this architecture)
153 if test x$endian = x1 ; then
159 trace="$trace_endian"
161 trace="${trace}_C:${ac_cv_sizeof_char}/${ac_cv_struct_boundary_char}:"
163 trace="${trace}_I:${ac_cv_sizeof_short_int}/${ac_cv_struct_boundary_short_int}"
164 trace="${trace}:${ac_cv_sizeof_int}/${ac_cv_struct_boundary_int}"
165 trace="${trace}:${ac_cv_sizeof_long_int}/${ac_cv_struct_boundary_long_int}"
166 trace="${trace}:${ac_cv_sizeof_long_long_int}/${ac_cv_struct_boundary_long_long_int}:"
168 trace="${trace}_P:${ac_cv_sizeof_void_p}/${ac_cv_struct_boundary_void_p}"
169 trace="${trace}:${ac_cv_sizeof_void_LpR_LvoidR}/${ac_cv_struct_boundary_void_p}:"
171 trace="${trace}_D:4/${ac_cv_struct_boundary_float}:8/${ac_cv_struct_boundary_double}:"
173 # sizeof float/double are not tested since IEEE 754 is assumed.
174 # Check README.IEEE for rational.
176 l_C:1/1:_I:2/2:4/4:4/4:8/4:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=0; gras_arch_name=little32;;
177 l_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=1; gras_arch_name=little64;;
178 B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/8:) gras_arch=2; gras_arch_name=big32;;
179 B_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=3; gras_arch_name=big64;;
180 B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=4; gras_arch_name=aix;;
182 if test x$gras_arch = xunknown ; then
183 AC_MSG_RESULT([damnit ($trace)])
184 AC_MSG_ERROR([Impossible to determine the GRAS architecture signature.
185 Please report this architecture trace ($trace) and what it corresponds to.])
187 echo "$as_me:$LINENO: GRAS trace of this machine: $trace" >&AS_MESSAGE_LOG_FD
188 AC_DEFINE_UNQUOTED(GRAS_THISARCH,$gras_arch,[defines the GRAS architecture signature of this machine])
189 AC_MSG_RESULT($gras_arch ($gras_arch_name))
191 # END OF GRAS ARCH CHECK
193 AC_DEFUN([GRAS_CHECK_STRUCT_COMPACTION],
194 [ AC_MSG_CHECKING(whether the struct gets packed)
195 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
196 #include <sys/types.h>
197 #include <stddef.h> /* offsetof() */
198 struct s {char c; double d;};
201 case (sizeof(struct s) == sizeof(double)+sizeof(char)):;
202 ]])],[gras_struct_packed=yes],[gras_struct_packed=no])
204 AC_MSG_RESULT($gras_struct_packed)
205 if test x$gras_struct_packed = "xyes" ; then
206 AC_MSG_ERROR([GRAS does not support packed structures since it leads to nasty misalignments])
209 AC_MSG_CHECKING(whether the struct gets compacted)
210 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
211 #include <sys/types.h>
212 #include <stddef.h> /* offsetof() */
213 struct s {double d; int i; char c;};
216 case (offsetof(struct s,c) == sizeof(double)+sizeof(int)):;
217 ]])],[gras_struct_compact=yes],[gras_struct_compact=no])
219 AC_MSG_RESULT($gras_struct_compact)
221 if test x$gras_struct_compact != xyes ; then
222 AC_MSG_ERROR([GRAS works only on structure compacting architectures (yet)])
224 AC_DEFINE_UNQUOTED(GRAS_STRUCT_COMPACT, 1,
225 [Defined if structures are compacted when possible.
227 Consider this structure: struct s {double d; int i; char c;};
229 If it is allowed, the char is placed just after the int. If not,
230 it has to be on the 8 bytes boundary imposed by the double.
232 For now, GRAS requires the structures to be compacted.
234 AC_MSG_CHECKING(whether arrays can straddle struct alignment boundaries)
236 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
237 #include <sys/types.h>
238 #include <stddef.h> /* offsetof() */
239 struct s { double d; int i; char c[6]; };
242 case (offsetof(struct s,c) == sizeof(double)+sizeof(int)):;
243 ]])],[gras_array_straddle_struct=yes],[gras_array_straddle_struct=no])
245 AC_MSG_RESULT($gras_array_straddle_struct)
247 if test x$gras_array_straddle_struct = xyes ; then
248 AC_DEFINE_UNQUOTED(GRAS_ARRAY_STRADDLE_STRUCT, 1,
249 [Defined if arrays in struct can straddle struct alignment boundaries.
251 This is like than the structure compaction above, but this time,
252 the argument to be compacted is an array whom each element would be
253 normally compacted. Exemple:
255 struct s { double d; int i; char c[6]; };
257 Arrays can straddle if c is allowed to come just after i.
259 Note that GRAS only support architecture presenting this
260 caracteristic so far.
263 AC_MSG_ERROR([GRAS can only work on architectures allowing array fields to straddle alignment boundaries (yet)])
266 # END OF GRAS CHECK STRUCT COMPACTION
268 AC_DEFUN([GRAS_C_COMPACT_STRUCT],
269 [ AC_MSG_CHECKING(whether the struct gets compacted)
270 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
271 #include <sys/types.h>
272 #include <stddef.h> /* offsetof() */
273 struct s {double d; int a; int b;};
276 case (offsetof(struct s,b) == sizeof(double)+sizeof(int)):;
277 ]])],[gras_compact_struct=yes],[gras_compact_struct=no])
279 AC_MSG_RESULT($gras_compact_struct)
281 if test x$gras_compact_struct = xyes ; then
282 AC_DEFINE_UNQUOTED(GRAS_COMPACT_STRUCT, 1,
283 [Defined if structures are compacted when possible])
286 # END OF GRAS COMPACT STRUCT