219 lines
6.8 KiB
Plaintext
219 lines
6.8 KiB
Plaintext
# $Id$
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# Check the sizes we know about, and see if any of them match what's needed.
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#
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# Prefer ints to anything else, because read, write and others historically
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# returned an int.
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AC_DEFUN(AM_SEARCH_USIZES, [
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case "$3" in
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"$ac_cv_sizeof_unsigned_int")
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$1="typedef unsigned int $2;";;
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"$ac_cv_sizeof_unsigned_char")
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$1="typedef unsigned char $2;";;
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"$ac_cv_sizeof_unsigned_short")
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$1="typedef unsigned short $2;";;
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"$ac_cv_sizeof_unsigned_long")
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$1="typedef unsigned long $2;";;
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"$ac_cv_sizeof_unsigned_long_long")
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$1="typedef unsigned long long $2;";;
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*)
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if test "$4" != "notfatal"; then
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AC_MSG_ERROR([No unsigned $3-byte integral type])
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fi;;
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esac])
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AC_DEFUN(AM_SEARCH_SSIZES, [
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case "$3" in
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"$ac_cv_sizeof_int")
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$1="typedef int $2;";;
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"$ac_cv_sizeof_char")
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$1="typedef char $2;";;
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"$ac_cv_sizeof_short")
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$1="typedef short $2;";;
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"$ac_cv_sizeof_long")
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$1="typedef long $2;";;
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"$ac_cv_sizeof_long_long")
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$1="typedef long long $2;";;
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*)
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if test "$4" != "notfatal"; then
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AC_MSG_ERROR([No signed $3-byte integral type])
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fi;;
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esac])
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# Check for the standard system types.
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AC_DEFUN(AM_TYPES, [
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# db.h includes <sys/types.h> and <stdio.h>, not the other default includes
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# autoconf usually includes. For that reason, we specify a set of includes
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# for all type checking tests. [#5060]
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#
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# C99 says types should be in <stdint.h>; include <stdint.h> if it exists.
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#
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# Some systems have types in <stddef.h>; include <stddef.h> if it exists.
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#
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# IBM's OS/390 and z/OS releases have types in <inttypes.h> not also found
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# in <sys/types.h>; include <inttypes.h> if it exists.
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db_includes="#include <sys/types.h>"
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AC_SUBST(inttypes_h_decl)
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AC_CHECK_HEADER(inttypes.h, [
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db_includes="$db_includes
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#include <inttypes.h>"
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inttypes_h_decl="#include <inttypes.h>"])
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# IRIX has stdint.h that is only available when using c99 (i.e. __c99
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# is defined). Problem with having it in a public header is that a c++
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# compiler cannot #include <db.h> if db.h #includes stdint.h, so we
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# need to check that stdint.h is available for all cases. Also the
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# IRIX compiler does not exit with a non-zero exit code when it sees
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# #error, so we actually need to use the header for the compiler to fail.
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AC_SUBST(stdint_h_decl)
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AC_MSG_CHECKING(for stdint.h)
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <stdint.h>
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int main() {
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uint_least8_t x=0;
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return x;
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}]])],[AC_MSG_RESULT(yes)
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if test "$db_cv_cxx" = "yes"; then
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AC_MSG_CHECKING([if stdint.h can be used by C++])
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AC_LANG_PUSH(C++)
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <stdint.h>
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int main() {
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uint_least8_t x=0;
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return x;
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}]])],[AC_MSG_RESULT(yes)
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stdint_h_decl="#include <stdint.h>"
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db_includes="$db_includes
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#include <stdint.h>"
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],[AC_MSG_RESULT(no)
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stdint_h_decl="#ifndef __cplusplus
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#include <stdint.h>
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#endif"
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db_includes="$db_includes
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#ifndef __cplusplus
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#include <stdint.h>
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#endif"
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])
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AC_LANG_POP
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else
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stdint_h_decl="#include <stdint.h>"
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db_includes="$db_includes
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#include <stdint.h>"
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fi],[AC_MSG_RESULT(no)])
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AC_SUBST(stddef_h_decl)
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AC_CHECK_HEADER(stddef.h, [
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db_includes="$db_includes
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#include <stddef.h>"
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stddef_h_decl="#include <stddef.h>"])
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AC_SUBST(unistd_h_decl)
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AC_CHECK_HEADER(unistd.h, [
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db_includes="$db_includes
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#include <unistd.h>"
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unistd_h_decl="#include <unistd.h>"])
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db_includes="$db_includes
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#include <stdio.h>"
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# We need to know the sizes of various objects on this system.
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AC_CHECK_SIZEOF(char,, $db_includes)
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AC_CHECK_SIZEOF(unsigned char,, $db_includes)
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AC_CHECK_SIZEOF(short,, $db_includes)
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AC_CHECK_SIZEOF(unsigned short,, $db_includes)
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AC_CHECK_SIZEOF(int,, $db_includes)
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AC_CHECK_SIZEOF(unsigned int,, $db_includes)
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AC_CHECK_SIZEOF(long,, $db_includes)
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AC_CHECK_SIZEOF(unsigned long,, $db_includes)
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AC_CHECK_SIZEOF(long long,, $db_includes)
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AC_CHECK_SIZEOF(unsigned long long,, $db_includes)
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AC_CHECK_SIZEOF(char *,, $db_includes)
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AC_CHECK_SIZEOF(long double,, $db_includes)
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# We look for u_char, u_short, u_int, u_long -- if we can't find them,
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# we create our own.
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AC_SUBST(u_char_decl)
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AC_CHECK_TYPE(u_char,,
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[u_char_decl="typedef unsigned char u_char;"], $db_includes)
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AC_SUBST(u_short_decl)
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AC_CHECK_TYPE(u_short,,
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[u_short_decl="typedef unsigned short u_short;"], $db_includes)
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AC_SUBST(u_int_decl)
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AC_CHECK_TYPE(u_int,,
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[u_int_decl="typedef unsigned int u_int;"], $db_includes)
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AC_SUBST(u_long_decl)
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AC_CHECK_TYPE(u_long,,
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[u_long_decl="typedef unsigned long u_long;"], $db_includes)
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# We look for fixed-size variants of u_char, u_short, u_int, u_long as well.
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AC_SUBST(u_int8_decl)
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AC_CHECK_TYPE(u_int8_t,,
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[AM_SEARCH_USIZES(u_int8_decl, u_int8_t, 1)], $db_includes)
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AC_SUBST(u_int16_decl)
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AC_CHECK_TYPE(u_int16_t,,
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[AM_SEARCH_USIZES(u_int16_decl, u_int16_t, 2)], $db_includes)
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AC_SUBST(int16_decl)
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AC_CHECK_TYPE(int16_t,,
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[AM_SEARCH_SSIZES(int16_decl, int16_t, 2)], $db_includes)
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AC_SUBST(u_int32_decl)
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AC_CHECK_TYPE(u_int32_t,,
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[AM_SEARCH_USIZES(u_int32_decl, u_int32_t, 4)], $db_includes)
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AC_SUBST(int32_decl)
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AC_CHECK_TYPE(int32_t,,
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[AM_SEARCH_SSIZES(int32_decl, int32_t, 4)], $db_includes)
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AC_SUBST(u_int64_decl)
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AC_CHECK_TYPE(u_int64_t,,
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[AM_SEARCH_USIZES(u_int64_decl, u_int64_t, 8, notfatal)], $db_includes)
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AC_SUBST(int64_decl)
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AC_CHECK_TYPE(int64_t,,
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[AM_SEARCH_SSIZES(int64_decl, int64_t, 8, notfatal)], $db_includes)
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AC_SUBST(long_double_decl)
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AC_CHECK_TYPE(long double,
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[long_double_decl="typedef long double long_double_t;"],
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[long_double_decl="typedef long double long_double_t;"], $db_includes)
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# No currently autoconf'd systems lack FILE, off_t pid_t, size_t, time_t.
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#
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# We require them, we don't try to substitute our own if we can't find them.
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AC_SUBST(FILE_t_decl)
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AC_CHECK_TYPE(FILE *,, AC_MSG_ERROR([No FILE type.]), $db_includes)
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AC_SUBST(off_t_decl)
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AC_CHECK_TYPE(off_t,, AC_MSG_ERROR([No off_t type.]), $db_includes)
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AC_SUBST(pid_t_decl)
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AC_CHECK_TYPE(pid_t,, AC_MSG_ERROR([No pid_t type.]), $db_includes)
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AC_SUBST(size_t_decl)
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AC_CHECK_TYPE(size_t,, AC_MSG_ERROR([No size_t type.]), $db_includes)
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AC_SUBST(time_t_decl)
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AC_CHECK_TYPE(time_t,, AC_MSG_ERROR([No time_t type.]), $db_includes)
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# Check for ssize_t -- if none exists, find a signed integral type that's
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# the same size as a size_t.
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AC_CHECK_SIZEOF(size_t,, $db_includes)
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AC_SUBST(ssize_t_decl)
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AC_CHECK_TYPE(ssize_t,,
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[AM_SEARCH_SSIZES(ssize_t_decl, ssize_t, $ac_cv_sizeof_size_t)],
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$db_includes)
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# Check for uintmax_t -- if none exists, find the largest unsigned integral
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# type available.
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AC_SUBST(uintmax_t_decl)
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AC_CHECK_TYPE(uintmax_t,, [AC_CHECK_TYPE(unsigned long long,
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[uintmax_t_decl="typedef unsigned long long uintmax_t;"],
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[uintmax_t_decl="typedef unsigned long uintmax_t;"], $db_includes)])
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# Check for uintptr_t -- if none exists, find an integral type which is
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# the same size as a pointer.
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AC_SUBST(uintptr_t_decl)
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AC_CHECK_TYPE(uintptr_t,,
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[AM_SEARCH_USIZES(uintptr_t_decl, uintptr_t, $ac_cv_sizeof_char_p)])
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])
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