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)
125 # GRAS_ARCH(): check the gras_architecture of this plateform
127 # The different cases here must be syncronized with the array in src/base/DataDesc/ddt_convert.c
129 AC_DEFUN([GRAS_ARCH],
131 # Check for the architecture
132 AC_C_BIGENDIAN(endian=1,endian=0,AC_MSG_ERROR([GRAS works only for little or big endian systems (yet)]))
133 dnl Make sure we don't run on a non-two-compliment arch, since we dunno convert them
134 GRAS_TWO_COMPLIMENT(int)
135 AC_DEFINE_UNQUOTED(GRAS_BIGENDIAN,$endian,[define if big endian])
137 GRAS_SIGNED_SIZEOF(char) GRAS_STRUCT_BOUNDARY(char)
138 GRAS_SIGNED_SIZEOF(short int) GRAS_STRUCT_BOUNDARY(short int)
139 GRAS_SIGNED_SIZEOF(int) GRAS_STRUCT_BOUNDARY(int)
140 GRAS_SIGNED_SIZEOF(long int) GRAS_STRUCT_BOUNDARY(long int)
141 GRAS_SIGNED_SIZEOF(long long int) GRAS_STRUCT_BOUNDARY(long long int)
143 GRAS_STRUCT_BOUNDARY(float) GRAS_STRUCT_BOUNDARY(double)
145 GRAS_CHECK_SIZEOF(void *) GRAS_STRUCT_BOUNDARY(void *)
146 GRAS_CHECK_SIZEOF(void (*) (void))
149 AC_MSG_CHECKING(the GRAS signature of this architecture)
150 if test x$endian = x1 ; then
156 trace="$trace_endian"
158 trace="${trace}_C:${ac_cv_sizeof_char}/${ac_cv_struct_boundary_char}:"
160 trace="${trace}_I:${ac_cv_sizeof_short_int}/${ac_cv_struct_boundary_short_int}"
161 trace="${trace}:${ac_cv_sizeof_int}/${ac_cv_struct_boundary_int}"
162 trace="${trace}:${ac_cv_sizeof_long_int}/${ac_cv_struct_boundary_long_int}"
163 trace="${trace}:${ac_cv_sizeof_long_long_int}/${ac_cv_struct_boundary_long_long_int}:"
165 trace="${trace}_P:${ac_cv_sizeof_void_p}/${ac_cv_struct_boundary_void_p}"
166 trace="${trace}:${ac_cv_sizeof_void_LpR_LvoidR}/${ac_cv_struct_boundary_void_p}:"
168 trace="${trace}_D:4/${ac_cv_struct_boundary_float}:8/${ac_cv_struct_boundary_double}:"
170 # sizeof float/double are not tested since IEEE 754 is assumed.
171 # Check README.IEEE for rational.
173 l_C:1/1:_I:2/2:4/4:4/4:8/4:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=0; gras_arch_name=little32;;
174 l_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=1; gras_arch_name=little64;;
175 B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/8:) gras_arch=2; gras_arch_name=big32;;
176 B_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=3; gras_arch_name=big64;;
178 if test x$gras_arch = xunknown ; then
179 AC_MSG_RESULT([damnit ($trace)])
180 AC_MSG_ERROR([Impossible to determine the GRAS architecture signature.
181 Please report this architecture trace ($trace) and what it corresponds to.])
183 echo "$as_me:$LINENO: GRAS trace of this machine: $trace" >&AS_MESSAGE_LOG_FD
184 AC_DEFINE_UNQUOTED(GRAS_THISARCH,$gras_arch,[defines the GRAS architecture signature of this machine])
185 AC_MSG_RESULT($gras_arch ($gras_arch_name))
187 # END OF GRAS ARCH CHECK
189 AC_DEFUN([GRAS_CHECK_STRUCT_COMPACTION],
190 [ AC_MSG_CHECKING(whether the struct gets packed)
191 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
192 #include <sys/types.h>
193 #include <stddef.h> /* offsetof() */
194 struct s {char c; double d;};
197 case (sizeof(struct s) == sizeof(double)+sizeof(char)):;
198 ]])],[gras_struct_packed=yes],[gras_struct_packed=no])
200 AC_MSG_RESULT($gras_struct_packed)
201 if test x$gras_struct_packed = "xyes" ; then
202 AC_MSG_ERROR([GRAS does not support packed structures since it leads to nasty misalignments])
205 AC_MSG_CHECKING(whether the struct gets compacted)
206 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
207 #include <sys/types.h>
208 #include <stddef.h> /* offsetof() */
209 struct s {double d; int i; char c;};
212 case (offsetof(struct s,c) == sizeof(double)+sizeof(int)):;
213 ]])],[gras_struct_compact=yes],[gras_struct_compact=no])
215 AC_MSG_RESULT($gras_struct_compact)
217 if test x$gras_struct_compact != xyes ; then
218 AC_MSG_ERROR([GRAS works only on structure compacting architectures (yet)])
220 AC_DEFINE_UNQUOTED(GRAS_STRUCT_COMPACT, 1,
221 [Defined if structures are compacted when possible.
223 Consider this structure: struct s {double d; int i; char c;};
225 If it is allowed, the char is placed just after the int. If not,
226 it has to be on the 8 bytes boundary imposed by the double.
228 For now, GRAS requires the structures to be compacted.
230 AC_MSG_CHECKING(whether arrays can straddle struct alignment boundaries)
232 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
233 #include <sys/types.h>
234 #include <stddef.h> /* offsetof() */
235 struct s { double d; int i; char c[6]; };
238 case (offsetof(struct s,c) == sizeof(double)+sizeof(int)):;
239 ]])],[gras_array_straddle_struct=yes],[gras_array_straddle_struct=no])
241 AC_MSG_RESULT($gras_array_straddle_struct)
243 if test x$gras_array_straddle_struct = xyes ; then
244 AC_DEFINE_UNQUOTED(GRAS_ARRAY_STRADDLE_STRUCT, 1,
245 [Defined if arrays in struct can straddle struct alignment boundaries.
247 This is like than the structure compaction above, but this time,
248 the argument to be compacted is an array whom each element would be
249 normally compacted. Exemple:
251 struct s { double d; int i; char c[6]; };
253 Arrays can straddle if c is allowed to come just after i.
255 Note that GRAS only support architecture presenting this
256 caracteristic so far.
259 AC_MSG_ERROR([GRAS can only work on architectures allowing array fields to straddle alignment boundaries (yet)])
262 # END OF GRAS CHECK STRUCT COMPACTION
264 AC_DEFUN([GRAS_C_COMPACT_STRUCT],
265 [ AC_MSG_CHECKING(whether the struct gets compacted)
266 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
267 #include <sys/types.h>
268 #include <stddef.h> /* offsetof() */
269 struct s {double d; int a; int b;};
272 case (offsetof(struct s,b) == sizeof(double)+sizeof(int)):;
273 ]])],[gras_compact_struct=yes],[gras_compact_struct=no])
275 AC_MSG_RESULT($gras_compact_struct)
277 if test x$gras_compact_struct = xyes ; then
278 AC_DEFINE_UNQUOTED(GRAS_COMPACT_STRUCT, 1,
279 [Defined if structures are compacted when possible])
282 # END OF GRAS COMPACT STRUCT