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_COMPLEMENT([type]): Make sure the type is two-complement
43 dnl warning, this does not work with char (quite logical)
45 AC_DEFUN([GRAS_TWO_COMPLEMENT],
47 AC_MSG_CHECKING(whether $1 is two-complement)
48 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
51 unsigned char bytes[sizeof($1)];
54 intTester.testInt = -2;
57 case (((unsigned int)intTester.bytes[0] +
58 (unsigned int)intTester.bytes[sizeof($1) - 1]) - 509) == 0:
60 ]])], dnl end of AC LANG PROGRAM
61 [two_complement=yes],[two_complement=no] )dnl end of AC COMPILE IFELSE
63 AC_MSG_RESULT($two_complement)
64 if test x$two_complement != xyes ; then
65 AC_MSG_ERROR([GRAS works only two-complement integers (yet)])
70 dnl GRAS_SIGNED_SIZEOF: Get the size of the datatype, and make sure that
71 dnl signed, unsigned and unspecified have the same size
73 AC_DEFUN([GRAS_SIGNED_SIZEOF],
74 [AC_MSG_CHECKING(size of $1)
75 GRAS_DO_CHECK_SIZEOF($1,$2)
76 unspecif=$GRAS_CHECK_SIZEOF_RES
77 if test x$unspecif = x ; then
78 AC_MSG_ERROR([cannot determine a size for $1])
81 GRAS_DO_CHECK_SIZEOF(signed $1,$2)
82 signed=$GRAS_CHECK_SIZEOF_RES
83 if test x$signed = x ; then
84 AC_MSG_ERROR([cannot determine a size for signed $1])
86 if test x$unspecif != x$signed ; then
87 AC_MSG_ERROR(['signed $1' and '$1' have different sizes ! ($signed != $unspecif)])
90 GRAS_DO_CHECK_SIZEOF(unsigned $1,$2)
91 unsigned=$GRAS_CHECK_SIZEOF_RES
92 if test x$unsigned = x ; then
93 AC_MSG_ERROR([cannot determine a size for unsigned $1])
95 if test x$unsigned != x$signed ; then
96 AC_MSG_ERROR(['signed $1' and 'unsigned $1' have different sizes ! ($signed != $unsigned)])
99 AC_MSG_RESULT($GRAS_CHECK_SIZEOF_RES)
103 dnl End of CHECK_SIGNED_SIZEOF
106 # GRAS_STRUCT_BOUNDARY(): Check the minimal alignment boundary of $1 in structures
107 # ---------------------
108 # (using integer, I hope no arch let it change with the content)
109 AC_DEFUN([GRAS_STRUCT_BOUNDARY],
110 [changequote(<<, >>)dnl
111 dnl The cache variable name (and of the result).
112 define(<<GRAS_STRUCT_BOUNDARY_RES>>, translit(ac_cv_struct_boundary_$1, [ *()], [_pLR]))dnl
114 AC_MSG_CHECKING(for the minimal structure boundary of $1)
116 AC_CACHE_VAL(GRAS_STRUCT_BOUNDARY_RES,
117 [for ac_size in 1 2 4 8 16 32 64 ; do # List sizes in rough order of prevalence.
118 AC_COMPILE_IFELSE(AC_LANG_PROGRAM([#include "confdefs.h"
119 #include <sys/types.h>
120 struct s { char c; $1 i; };
121 ],[switch (0) case 0: case (sizeof (struct s) == $ac_size+sizeof($1)):;]), GRAS_STRUCT_BOUNDARY_RES=$ac_size)
122 if test x$GRAS_STRUCT_BOUNDARY_RES != x ; then break; fi
125 AC_MSG_RESULT($GRAS_STRUCT_BOUNDARY_RES)
126 if test x$GRAS_STRUCT_BOUNDARY_RES = x ; then
127 AC_MSG_ERROR([Cannot determine the minimal alignment boundary of $1 in structures])
131 # GRAS_ARCH(): check the gras_architecture of this plateform
133 # The different cases here must be syncronized with the array in src/base/DataDesc/ddt_convert.c
135 AC_DEFUN([GRAS_ARCH],
137 # Check for the architecture
138 AC_C_BIGENDIAN(endian=1,endian=0,AC_MSG_ERROR([GRAS works only for little or big endian systems (yet)]))
139 dnl Make sure we don't run on a non-two-complement arch, since we dunno convert them
140 dnl G RAS_TWO_COMPLEMENT(int) don't do this, it breaks cross-compile and all
141 dnl archs conform to this
142 AC_DEFINE_UNQUOTED(GRAS_BIGENDIAN,$endian,[define if big endian])
144 GRAS_SIGNED_SIZEOF(char) GRAS_STRUCT_BOUNDARY(char)
145 GRAS_SIGNED_SIZEOF(short int) GRAS_STRUCT_BOUNDARY(short int)
146 GRAS_SIGNED_SIZEOF(int) GRAS_STRUCT_BOUNDARY(int)
147 GRAS_SIGNED_SIZEOF(long int) GRAS_STRUCT_BOUNDARY(long int)
148 GRAS_SIGNED_SIZEOF(long long int) GRAS_STRUCT_BOUNDARY(long long int)
150 GRAS_STRUCT_BOUNDARY(float) GRAS_STRUCT_BOUNDARY(double)
152 GRAS_CHECK_SIZEOF(void *) GRAS_STRUCT_BOUNDARY(void *)
153 GRAS_CHECK_SIZEOF(void (*) (void))
156 AC_MSG_CHECKING(the GRAS signature of this architecture)
157 if test x$endian = x1 ; then
163 trace="$trace_endian"
165 trace="${trace}_C:${ac_cv_sizeof_char}/${ac_cv_struct_boundary_char}:"
167 trace="${trace}_I:${ac_cv_sizeof_short_int}/${ac_cv_struct_boundary_short_int}"
168 trace="${trace}:${ac_cv_sizeof_int}/${ac_cv_struct_boundary_int}"
169 trace="${trace}:${ac_cv_sizeof_long_int}/${ac_cv_struct_boundary_long_int}"
170 trace="${trace}:${ac_cv_sizeof_long_long_int}/${ac_cv_struct_boundary_long_long_int}:"
172 trace="${trace}_P:${ac_cv_sizeof_void_p}/${ac_cv_struct_boundary_void_p}"
173 trace="${trace}:${ac_cv_sizeof_void_LpR_LvoidR}/${ac_cv_struct_boundary_void_p}:"
175 trace="${trace}_D:4/${ac_cv_struct_boundary_float}:8/${ac_cv_struct_boundary_double}:"
177 # sizeof float/double are not tested since IEEE 754 is assumed.
178 # Check README.IEEE for rational.
180 # The numbers after the _ in the arch name are the maximal packing boundary.
181 # big32_2 means that all data are aligned on a 2 bytes boundary. (ARM)
182 # big32_8_4 means that some or them are aligned on 8 bytes, some are on 4 bytes (AIX)
184 l_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/8:) gras_arch=0; gras_arch_name=little32;;
185 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=1; gras_arch_name=little32_4;;
187 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=2; gras_arch_name=little64;;
189 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=3; gras_arch_name=big32;;
190 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=big32_8_4;;
191 B_C:1/1:_I:2/2:4/4:4/4:8/4:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=5; gras_arch_name=big32_4;;
192 B_C:1/1:_I:2/2:4/2:4/2:8/2:_P:4/2:4/2:_D:4/2:8/2:) gras_arch=6; gras_arch_name=big32_2;;
194 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=7; gras_arch_name=big64;;
196 if test x$gras_arch = xunknown ; then
197 AC_MSG_RESULT([damnit ($trace)])
198 AC_MSG_ERROR([Impossible to determine the GRAS architecture signature.
199 Please report this architecture trace ($trace) and what it corresponds to.])
201 echo "$as_me:$LINENO: GRAS trace of this machine: $trace" >&AS_MESSAGE_LOG_FD
202 AC_DEFINE_UNQUOTED(GRAS_THISARCH,$gras_arch,[defines the GRAS architecture signature of this machine])
203 AC_MSG_RESULT($gras_arch ($gras_arch_name))
205 # END OF GRAS ARCH CHECK
207 AC_DEFUN([GRAS_CHECK_STRUCT_COMPACTION],
208 [ AC_MSG_CHECKING(whether the struct gets packed)
209 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
210 #include <sys/types.h>
211 #include <stddef.h> /* offsetof() */
212 struct s {char c; double d;};
215 case (sizeof(struct s) == sizeof(double)+sizeof(char)):;
216 ]])],[gras_struct_packed=yes],[gras_struct_packed=no])
218 AC_MSG_RESULT($gras_struct_packed)
219 if test x$gras_struct_packed = "xyes" ; then
220 AC_MSG_ERROR([GRAS does not support packed structures since it leads to nasty misalignments])
223 AC_MSG_CHECKING(whether the struct gets compacted)
224 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
225 #include <sys/types.h>
226 #include <stddef.h> /* offsetof() */
227 struct s {double d; int i; char c;};
230 case (offsetof(struct s,c) == sizeof(double)+sizeof(int)):;
231 ]])],[gras_struct_compact=yes],[gras_struct_compact=no])
233 AC_MSG_RESULT($gras_struct_compact)
235 if test x$gras_struct_compact != xyes ; then
236 AC_MSG_ERROR([GRAS works only on structure compacting architectures (yet)])
238 AC_DEFINE_UNQUOTED(GRAS_STRUCT_COMPACT, 1,
239 [Defined if structures are compacted when possible.
241 Consider this structure: struct s {double d; int i; char c;};
243 If it is allowed, the char is placed just after the int. If not,
244 it has to be on the 8 bytes boundary imposed by the double.
246 For now, GRAS requires the structures to be compacted.
248 AC_MSG_CHECKING(whether arrays can straddle struct alignment boundaries)
250 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
251 #include <sys/types.h>
252 #include <stddef.h> /* offsetof() */
253 struct s { double d; int i; char c[6]; };
256 case (offsetof(struct s,c) == sizeof(double)+sizeof(int)):;
257 ]])],[gras_array_straddle_struct=yes],[gras_array_straddle_struct=no])
259 AC_MSG_RESULT($gras_array_straddle_struct)
261 if test x$gras_array_straddle_struct = xyes ; then
262 AC_DEFINE_UNQUOTED(GRAS_ARRAY_STRADDLE_STRUCT, 1,
263 [Defined if arrays in struct can straddle struct alignment boundaries.
265 This is like than the structure compaction above, but this time,
266 the argument to be compacted is an array whom each element would be
267 normally compacted. Exemple:
269 struct s { double d; int i; char c[6]; };
271 Arrays can straddle if c is allowed to come just after i.
273 Note that GRAS only support architecture presenting this
274 caracteristic so far.
277 AC_MSG_ERROR([GRAS can only work on architectures allowing array fields to straddle alignment boundaries (yet)])
280 # END OF GRAS CHECK STRUCT COMPACTION
282 AC_DEFUN([GRAS_C_COMPACT_STRUCT],
283 [ AC_MSG_CHECKING(whether the struct gets compacted)
284 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
285 #include <sys/types.h>
286 #include <stddef.h> /* offsetof() */
287 struct s {double d; int a; int b;};
290 case (offsetof(struct s,b) == sizeof(double)+sizeof(int)):;
291 ]])],[gras_compact_struct=yes],[gras_compact_struct=no])
293 AC_MSG_RESULT($gras_compact_struct)
295 if test x$gras_compact_struct = xyes ; then
296 AC_DEFINE_UNQUOTED(GRAS_COMPACT_STRUCT, 1,
297 [Defined if structures are compacted when possible])
300 # END OF GRAS COMPACT STRUCT