134 lines
3.8 KiB
Plaintext
134 lines
3.8 KiB
Plaintext
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dnl Host type sizes probe.
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dnl By Kaveh R. Ghazi. One typo fixed since.
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dnl
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AC_DEFUN([gcc_AC_COMPILE_CHECK_SIZEOF],
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[changequote(<<, >>)dnl
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dnl The name to #define.
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define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl
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dnl The cache variable name.
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define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl
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changequote([, ])dnl
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AC_MSG_CHECKING(size of $1)
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AC_CACHE_VAL(AC_CV_NAME,
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[for ac_size in 4 8 1 2 16 $3 ; do # List sizes in rough order of prevalence.
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AC_TRY_COMPILE([#include "confdefs.h"
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#include <sys/types.h>
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$2
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], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size)
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if test x$AC_CV_NAME != x ; then break; fi
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done
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])
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if test x$AC_CV_NAME = x ; then
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AC_MSG_ERROR([cannot determine a size for $1])
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fi
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AC_MSG_RESULT($AC_CV_NAME)
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AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1])
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undefine([AC_TYPE_NAME])dnl
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undefine([AC_CV_NAME])dnl
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])
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dnl Utility macro used by next two tests.
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dnl AC_EXAMINE_OBJECT(C source code,
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dnl commands examining object file,
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dnl [commands to run if compile failed]):
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dnl
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dnl Compile the source code to an object file; then convert it into a
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dnl printable representation. All unprintable characters and
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dnl asterisks (*) are replaced by dots (.). All white space is
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dnl deleted. Newlines (ASCII 0x10) in the input are preserved in the
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dnl output, but runs of newlines are compressed to a single newline.
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dnl Finally, line breaks are forcibly inserted so that no line is
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dnl longer than 80 columns and the file ends with a newline. The
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dnl result of all this processing is in the file conftest.dmp, which
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dnl may be examined by the commands in the second argument.
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dnl
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AC_DEFUN([gcc_AC_EXAMINE_OBJECT],
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[AC_LANG_SAVE
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AC_LANG_C
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dnl Next bit cribbed from AC_TRY_COMPILE.
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cat > conftest.$ac_ext <<EOF
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[#line __oline__ "configure"
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#include "confdefs.h"
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$1
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]EOF
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if AC_TRY_EVAL(ac_compile); then
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od -c conftest.o |
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sed ['s/^[0-7]*[ ]*/ /
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s/\*/./g
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s/ \\n/*/g
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s/ [0-9][0-9][0-9]/./g
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s/ \\[^ ]/./g'] |
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tr -d '
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' | tr -s '*' '
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' | fold | sed '$a\
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' > conftest.dmp
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$2
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ifelse($3, , , else
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$3
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)dnl
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fi
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rm -rf conftest*
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AC_LANG_RESTORE])
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dnl Host endianness probe.
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dnl Differs from AC_C_BIGENDIAN in that it does not require
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dnl running a program on the host.
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dnl
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AC_DEFUN([fastjar_AC_COMPILE_C_BIGENDIAN],
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[AC_CACHE_CHECK(byte ordering, ac_cv_c_compile_endian,
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[ac_cv_c_compile_endian=unknown
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gcc_AC_EXAMINE_OBJECT([
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#ifdef HAVE_LIMITS_H
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# include <limits.h>
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#endif
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/* This structure must have no internal padding. */
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struct {
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char prefix[sizeof "\nendian:" - 1];
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short word;
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char postfix[2];
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} tester = {
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"\nendian:",
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#if SIZEOF_SHORT == 4
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('A' << (CHAR_BIT * 3)) | ('B' << (CHAR_BIT * 2)) |
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#endif
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('A' << CHAR_BIT) | 'B',
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'X', '\n'
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};],
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[if grep 'endian:AB' conftest.dmp >/dev/null 2>&1; then
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ac_cv_c_compile_endian=big-endian
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elif grep 'endian:BA' conftest.dmp >/dev/null 2>&1; then
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ac_cv_c_compile_endian=little-endian
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fi])
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])
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if test $ac_cv_c_compile_endian = unknown; then
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AC_MSG_ERROR([*** unable to determine endianness])
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elif test $ac_cv_c_compile_endian = big-endian; then
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AC_DEFINE(WORDS_BIG_ENDIAN, 1,
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[Define if the host machine stores words of multi-word integers in
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big-endian order.])
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fi
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])
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dnl Define MKDIR_TAKES_ONE_ARG if mkdir accepts only one argument instead
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dnl of the usual 2.
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AC_DEFUN(gcc_AC_FUNC_MKDIR_TAKES_ONE_ARG,
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[AC_CACHE_CHECK([if mkdir takes one argument], gcc_cv_mkdir_takes_one_arg,
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[AC_TRY_COMPILE([
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#include <sys/types.h>
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#ifdef HAVE_SYS_STAT_H
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# include <sys/stat.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_DIRECT_H
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# include <direct.h>
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#endif], [mkdir ("foo", 0);],
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gcc_cv_mkdir_takes_one_arg=no, gcc_cv_mkdir_takes_one_arg=yes)])
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if test $gcc_cv_mkdir_takes_one_arg = yes ; then
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AC_DEFINE(MKDIR_TAKES_ONE_ARG, 1, [Define if host mkdir takes a
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single argument.])
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fi
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])
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