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/${ac_cv_struct_boundary_double}:"
170 # sizeof float/double are not tested since IEEE 754 is assumed.
171 # Check README.IEEE for rational.
173 l_C:1/1:_I:2/2:4/4:4/4:8/4:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=0; gras_arch_name=little32;;
174 l_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=1; gras_arch_name=little64;;
175 B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/8:) gras_arch=2; gras_arch_name=big32;;
176 B_C:1/1:_I:2/2:4/4:8/8:8/8:_P:8/8:8/8:_D:4/4:8/8:) gras_arch=3; gras_arch_name=big64;;
177 B_C:1/1:_I:2/2:4/4:4/4:8/8:_P:4/4:4/4:_D:4/4:8/4:) gras_arch=4; gras_arch_name=aix;;
179 if test x$gras_arch = xunknown ; then
180 AC_MSG_RESULT([damnit ($trace)])
181 AC_MSG_ERROR([Impossible to determine the GRAS architecture signature.
182 Please report this architecture trace ($trace) and what it corresponds to.])
184 echo "$as_me:$LINENO: GRAS trace of this machine: $trace" >&AS_MESSAGE_LOG_FD
185 AC_DEFINE_UNQUOTED(GRAS_THISARCH,$gras_arch,[defines the GRAS architecture signature of this machine])
186 AC_MSG_RESULT($gras_arch ($gras_arch_name))
188 # END OF GRAS ARCH CHECK
190 AC_DEFUN([GRAS_CHECK_STRUCT_COMPACTION],
191 [ AC_MSG_CHECKING(whether the struct gets packed)
192 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
193 #include <sys/types.h>
194 #include <stddef.h> /* offsetof() */
195 struct s {char c; double d;};
198 case (sizeof(struct s) == sizeof(double)+sizeof(char)):;
199 ]])],[gras_struct_packed=yes],[gras_struct_packed=no])
201 AC_MSG_RESULT($gras_struct_packed)
202 if test x$gras_struct_packed = "xyes" ; then
203 AC_MSG_ERROR([GRAS does not support packed structures since it leads to nasty misalignments])
206 AC_MSG_CHECKING(whether the struct gets compacted)
207 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
208 #include <sys/types.h>
209 #include <stddef.h> /* offsetof() */
210 struct s {double d; int i; char c;};
213 case (offsetof(struct s,c) == sizeof(double)+sizeof(int)):;
214 ]])],[gras_struct_compact=yes],[gras_struct_compact=no])
216 AC_MSG_RESULT($gras_struct_compact)
218 if test x$gras_struct_compact != xyes ; then
219 AC_MSG_ERROR([GRAS works only on structure compacting architectures (yet)])
221 AC_DEFINE_UNQUOTED(GRAS_STRUCT_COMPACT, 1,
222 [Defined if structures are compacted when possible.
224 Consider this structure: struct s {double d; int i; char c;};
226 If it is allowed, the char is placed just after the int. If not,
227 it has to be on the 8 bytes boundary imposed by the double.
229 For now, GRAS requires the structures to be compacted.
231 AC_MSG_CHECKING(whether arrays can straddle struct alignment boundaries)
233 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
234 #include <sys/types.h>
235 #include <stddef.h> /* offsetof() */
236 struct s { double d; int i; char c[6]; };
239 case (offsetof(struct s,c) == sizeof(double)+sizeof(int)):;
240 ]])],[gras_array_straddle_struct=yes],[gras_array_straddle_struct=no])
242 AC_MSG_RESULT($gras_array_straddle_struct)
244 if test x$gras_array_straddle_struct = xyes ; then
245 AC_DEFINE_UNQUOTED(GRAS_ARRAY_STRADDLE_STRUCT, 1,
246 [Defined if arrays in struct can straddle struct alignment boundaries.
248 This is like than the structure compaction above, but this time,
249 the argument to be compacted is an array whom each element would be
250 normally compacted. Exemple:
252 struct s { double d; int i; char c[6]; };
254 Arrays can straddle if c is allowed to come just after i.
256 Note that GRAS only support architecture presenting this
257 caracteristic so far.
260 AC_MSG_ERROR([GRAS can only work on architectures allowing array fields to straddle alignment boundaries (yet)])
263 # END OF GRAS CHECK STRUCT COMPACTION
265 AC_DEFUN([GRAS_C_COMPACT_STRUCT],
266 [ AC_MSG_CHECKING(whether the struct gets compacted)
267 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "confdefs.h"
268 #include <sys/types.h>
269 #include <stddef.h> /* offsetof() */
270 struct s {double d; int a; int b;};
273 case (offsetof(struct s,b) == sizeof(double)+sizeof(int)):;
274 ]])],[gras_compact_struct=yes],[gras_compact_struct=no])
276 AC_MSG_RESULT($gras_compact_struct)
278 if test x$gras_compact_struct = xyes ; then
279 AC_DEFINE_UNQUOTED(GRAS_COMPACT_STRUCT, 1,
280 [Defined if structures are compacted when possible])
283 # END OF GRAS COMPACT STRUCT