acinclude.m4 - grub4dos-solaris - Rivoreo Source Code Repositories

 dnl grub_ASM_USCORE checks if C symbols get an underscore after
 dnl compiling to assembler.
 dnl Written by Pavel Roskin. Based on grub_ASM_EXT_C written by
 dnl Erich Boleyn and modified by OKUJI Yoshinori
 AC_DEFUN([grub_ASM_USCORE],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING([if C symbols get an underscore after compilation])
 AC_CACHE_VAL(grub_cv_asm_uscore,
 [cat > conftest.c <<\EOF
 int
 func (int *list)
 {
   *list = 0;
   return *list;
 }
 EOF

 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -S conftest.c]) && test -s conftest.s; then
   true
 else
   AC_MSG_ERROR([${CC-cc} failed to produce assembly code])
 fi

 if grep _func conftest.s >/dev/null 2>&1; then
   grub_cv_asm_uscore=yes
 else
   grub_cv_asm_uscore=no
 fi

 rm -f conftest*])

 if test "x$grub_cv_asm_uscore" = xyes; then
   AC_DEFINE_UNQUOTED([HAVE_ASM_USCORE], $grub_cv_asm_uscore,
     [Define if C symbols get an underscore after compilation])
 fi

 AC_MSG_RESULT([$grub_cv_asm_uscore])
 ])


 dnl Some versions of `objcopy -O binary' vary their output depending
 dnl on the link address.
 AC_DEFUN([grub_PROG_OBJCOPY_ABSOLUTE],
 [AC_MSG_CHECKING([whether ${OBJCOPY} works for absolute addresses])
 AC_CACHE_VAL(grub_cv_prog_objcopy_absolute,
 [cat > conftest.c <<\EOF
 void
 cmain (void)
 {
    *((int *) 0x1000) = 2;
 }
 EOF

 if AC_TRY_EVAL(ac_compile) && test -s conftest.o; then :
 else
   AC_MSG_ERROR([${CC-cc} cannot compile C source code])
 fi
 grub_cv_prog_objcopy_absolute=yes
 for link_addr in 2000 8000 7C00; do
   if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -nostdlib -Wl,-Ttext -Wl,$link_addr ${LDFLAGS} conftest.o -o conftest.exec]); then :
   else
     AC_MSG_ERROR([${CC-cc} cannot link at address $link_addr])
   fi
   if AC_TRY_COMMAND([${OBJCOPY-objcopy} -O binary conftest.exec conftest]); then :
   else
     AC_MSG_ERROR([${OBJCOPY-objcopy} cannot create binary files])
   fi
   if test ! -f conftest.old || AC_TRY_COMMAND([cmp -s conftest.old conftest]); then
     mv -f conftest conftest.old
   else
     grub_cv_prog_objcopy_absolute=no
     break
   fi
 done
 rm -f conftest*])
 AC_MSG_RESULT([$grub_cv_prog_objcopy_absolute])])

 dnl Mass confusion!
 dnl Older versions of GAS interpret `.code16' to mean ``generate 32-bit
 dnl instructions, but implicitly insert addr32 and data32 bytes so
 dnl that the code works in real mode''.
 dnl
 dnl Newer versions of GAS interpret `.code16' to mean ``generate 16-bit
 dnl instructions,'' which seems right.  This requires the programmer
 dnl to explicitly insert addr32 and data32 instructions when they want
 dnl them.
 dnl
 dnl We only support the newer versions, because the old versions cause
 dnl major pain, by requiring manual assembly to get 16-bit instructions into
 dnl stage1/stage1.S.
 AC_DEFUN([grub_ASM_ADDR32],
 [AC_REQUIRE([AC_PROG_CC])
 AC_REQUIRE([grub_ASM_PREFIX_REQUIREMENT])
 AC_MSG_CHECKING([for .code16 addr32 assembler support])
 AC_CACHE_VAL(grub_cv_asm_addr32,
 [cat > conftest.s.in <<\EOF
 	.code16
 l1:	@ADDR32@	movb	%al, l1
 EOF

 if test "x$grub_cv_asm_prefix_requirement" = xyes; then
   sed -e s/@ADDR32@/addr32/ < conftest.s.in > conftest.s
 else
   sed -e s/@ADDR32@/addr32\;/ < conftest.s.in > conftest.s
 fi

 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
   grub_cv_asm_addr32=yes
 else
   grub_cv_asm_addr32=no
 fi

 rm -f conftest*])

 AC_MSG_RESULT([$grub_cv_asm_addr32])])

 dnl
 dnl Later versions of GAS requires that addr32 and data32 prefixes
 dnl appear in the same lines as the instructions they modify, while
 dnl earlier versions requires that they appear in separate lines.
 AC_DEFUN([grub_ASM_PREFIX_REQUIREMENT],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING(dnl
 [whether addr32 must be in the same line as the instruction])
 AC_CACHE_VAL(grub_cv_asm_prefix_requirement,
 [cat > conftest.s <<\EOF
 	.code16
 l1:	addr32	movb	%al, l1
 EOF

 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
   grub_cv_asm_prefix_requirement=yes
 else
   grub_cv_asm_prefix_requirement=no
 fi

 rm -f conftest*])

 if test "x$grub_cv_asm_prefix_requirement" = xyes; then
   grub_tmp_addr32="addr32"
   grub_tmp_data32="data32"
 else
   grub_tmp_addr32="addr32;"
   grub_tmp_data32="data32;"
 fi

 AC_DEFINE_UNQUOTED([ADDR32], $grub_tmp_addr32,
   [Define it to \"addr32\" or \"addr32;\" to make GAS happy])
 AC_DEFINE_UNQUOTED([DATA32], $grub_tmp_data32,
   [Define it to \"data32\" or \"data32;\" to make GAS happy])

 AC_MSG_RESULT([$grub_cv_asm_prefix_requirement])])

 dnl
 dnl Older versions of GAS require that absolute indirect calls/jumps are
 dnl not prefixed with `*', while later versions warn if not prefixed.
 AC_DEFUN([grub_ASM_ABSOLUTE_WITHOUT_ASTERISK],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING(dnl
 [whether an absolute indirect call/jump must not be prefixed with an asterisk])
 AC_CACHE_VAL(grub_cv_asm_absolute_without_asterisk,
 [cat > conftest.s <<\EOF
 	lcall	*(offset)
 offset:
 	.long	0
 	.word	0
 EOF

 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
   grub_cv_asm_absolute_without_asterisk=no
 else
   grub_cv_asm_absolute_without_asterisk=yes
 fi

 rm -f conftest*])

 if test "x$grub_cv_asm_absolute_without_asterisk" = xyes; then
   AC_DEFINE(ABSOLUTE_WITHOUT_ASTERISK, 1, [Define if an absolute indirect call/jump must NOT be prefixed with `*'])
 fi

 AC_MSG_RESULT([$grub_cv_asm_absolute_without_asterisk])])

 dnl
 dnl grub_CHECK_START_SYMBOL checks if start is automatically defined by
 dnl the compiler.
 dnl Written by OKUJI Yoshinori
 AC_DEFUN([grub_CHECK_START_SYMBOL],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING([if start is defined by the compiler])
 AC_CACHE_VAL(grub_cv_check_start_symbol,
 [AC_TRY_LINK([], [asm ("incl start")],
    grub_cv_check_start_symbol=yes,
    grub_cv_check_start_symbol=no)])

 if test "x$grub_cv_check_start_symbol" = xyes; then
   AC_DEFINE(HAVE_START_SYMBOL, 1, [Define if start is defined])
 fi

 AC_MSG_RESULT([$grub_cv_check_start_symbol])
 ])

 dnl
 dnl grub_CHECK_USCORE_START_SYMBOL checks if _start is automatically
 dnl defined by the compiler.
 dnl Written by OKUJI Yoshinori
 AC_DEFUN([grub_CHECK_USCORE_START_SYMBOL],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING([if _start is defined by the compiler])
 AC_CACHE_VAL(grub_cv_check_uscore_start_symbol,
 [AC_TRY_LINK([], [asm ("incl _start")],
    grub_cv_check_uscore_start_symbol=yes,
    grub_cv_check_uscore_start_symbol=no)])

 if test "x$grub_cv_check_uscore_start_symbol" = xyes; then
   AC_DEFINE(HAVE_USCORE_START_SYMBOL, 1, [Define if _start is defined])
 fi

 AC_MSG_RESULT([$grub_cv_check_uscore_start_symbol])
 ])

 dnl
 dnl grub_CHECK_USCORE_USCORE_BSS_START_SYMBOL checks if __bss_start is
 dnl automatically defined by the compiler.
 dnl Written by Michael Hohmoth.
 AC_DEFUN([grub_CHECK_USCORE_USCORE_BSS_START_SYMBOL],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING([if __bss_start is defined by the compiler])
 AC_CACHE_VAL(grub_cv_check_uscore_uscore_bss_start_symbol,
 [AC_TRY_LINK([], [asm ("incl __bss_start")],
    grub_cv_check_uscore_uscore_bss_start_symbol=yes,
    grub_cv_check_uscore_uscore_bss_start_symbol=no)])

 if test "x$grub_cv_check_uscore_uscore_bss_start_symbol" = xyes; then
   AC_DEFINE(HAVE_USCORE_USCORE_BSS_START_SYMBOL, 1, [Define if __bss_start is defined])
 fi

 AC_MSG_RESULT([$grub_cv_check_uscore_uscore_bss_start_symbol])
 ])

 dnl
 dnl grub_CHECK_EDATA_SYMBOL checks if edata is automatically defined by the
 dnl compiler.
 dnl Written by Michael Hohmuth.
 AC_DEFUN([grub_CHECK_EDATA_SYMBOL],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING([if edata is defined by the compiler])
 AC_CACHE_VAL(grub_cv_check_edata_symbol,
 [AC_TRY_LINK([], [asm ("incl edata")],
    grub_cv_check_edata_symbol=yes,
    grub_cv_check_edata_symbol=no)])

 if test "x$grub_cv_check_edata_symbol" = xyes; then
   AC_DEFINE(HAVE_EDATA_SYMBOL, 1, [Define if edata is defined])
 fi

 AC_MSG_RESULT([$grub_cv_check_edata_symbol])
 ])

 dnl
 dnl grub_CHECK_USCORE_EDATA_SYMBOL checks if _edata is automatically
 dnl defined by the compiler.
 dnl Written by Michael Hohmuth.
 AC_DEFUN([grub_CHECK_USCORE_EDATA_SYMBOL],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING([if _edata is defined by the compiler])
 AC_CACHE_VAL(grub_cv_check_uscore_edata_symbol,
 [AC_TRY_LINK([], [asm ("incl _edata")],
    grub_cv_check_uscore_edata_symbol=yes,
    grub_cv_check_uscore_edata_symbol=no)])

 if test "x$grub_cv_check_uscore_edata_symbol" = xyes; then
   AC_DEFINE(HAVE_USCORE_EDATA_SYMBOL, 1, [Define if _edata is defined])
 fi

 AC_MSG_RESULT([$grub_cv_check_uscore_edata_symbol])
 ])

 dnl
 dnl grub_CHECK_END_SYMBOL checks if end is automatically defined by the
 dnl compiler.
 dnl Written by OKUJI Yoshinori
 AC_DEFUN([grub_CHECK_END_SYMBOL],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING([if end is defined by the compiler])
 AC_CACHE_VAL(grub_cv_check_end_symbol,
 [AC_TRY_LINK([], [asm ("incl end")],
    grub_cv_check_end_symbol=yes,
    grub_cv_check_end_symbol=no)])

 if test "x$grub_cv_check_end_symbol" = xyes; then
   AC_DEFINE(HAVE_END_SYMBOL, 1, [Define if end is defined])
 fi

 AC_MSG_RESULT([$grub_cv_check_end_symbol])
 ])

 dnl
 dnl grub_CHECK_USCORE_END_SYMBOL checks if _end is automatically defined
 dnl by the compiler.
 dnl Written by OKUJI Yoshinori
 AC_DEFUN([grub_CHECK_USCORE_END_SYMBOL],
 [AC_REQUIRE([AC_PROG_CC])
 AC_MSG_CHECKING([if _end is defined by the compiler])
 AC_CACHE_VAL(grub_cv_check_uscore_end_symbol,
 [AC_TRY_LINK([], [asm ("incl _end")],
    grub_cv_check_uscore_end_symbol=yes,
    grub_cv_check_uscore_end_symbol=no)])

 if test "x$grub_cv_check_uscore_end_symbol" = xyes; then
   AC_DEFINE(HAVE_USCORE_END_SYMBOL, 1, [Define if end is defined])
 fi

 AC_MSG_RESULT([$grub_cv_check_uscore_end_symbol])
 ])

 dnl grub_DEFINE_FILE(MACRO_NAME, FILE_NAME, DESCRIPTION)
 dnl grub_DEFINE_FILE defines a macro as the contents of a file safely.
 dnl Replace some escape sequences, because autoconf doesn't handle them
 dnl gracefully.
 dnl Written by OKUJI Yoshinori.
 AC_DEFUN([grub_DEFINE_FILE],
 [AC_REQUIRE([AC_PROG_CC])
 # Because early versions of GNU sed 3.x are too buggy, use a C program
 # instead of shell commands. *sigh*
 cat >conftest.c <<\EOF
 #include <stdio.h>

 int
 main (void)
 {
   int c;

   while ((c = getchar ()) != EOF)
     {
       switch (c)
         {
 	case '\n':
 	  fputs ("\\n", stdout);
 	  break;
 	case '\r':
 	  fputs ("\\r", stdout);
 	  break;
 	case '\\':
 	  fputs ("\\\\", stdout);
 	  break;
 	case '"':
 	  fputs ("\\\"", stdout);
 	  break;
 	default:
 	  putchar (c);
 	}
     }

   return 0;
 }
 EOF

 if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} conftest.c -o conftest]) && test -s conftest; then
   grub_tmp_value=`./conftest < "[$2]"`
 else
   AC_MSG_ERROR([${CC-cc} failed to produce an executable file])
 fi

 AC_DEFINE_UNQUOTED([$1], "$grub_tmp_value", [$3])
 rm -f conftest*
 ])
	dnl grub_ASM_USCORE checks if C symbols get an underscore after
	dnl compiling to assembler.
	dnl Written by Pavel Roskin. Based on grub_ASM_EXT_C written by
	dnl Erich Boleyn and modified by OKUJI Yoshinori
	AC_DEFUN([grub_ASM_USCORE],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING([if C symbols get an underscore after compilation])
	AC_CACHE_VAL(grub_cv_asm_uscore,
	[cat > conftest.c <<\EOF
	int
	func (int *list)
	{
	*list = 0;
	return *list;
	}
	EOF

	if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -S conftest.c]) && test -s conftest.s; then
	true
	else
	AC_MSG_ERROR([${CC-cc} failed to produce assembly code])
	fi

	if grep _func conftest.s >/dev/null 2>&1; then
	grub_cv_asm_uscore=yes
	else
	grub_cv_asm_uscore=no
	fi

	rm -f conftest*])

	if test "x$grub_cv_asm_uscore" = xyes; then
	AC_DEFINE_UNQUOTED([HAVE_ASM_USCORE], $grub_cv_asm_uscore,
	[Define if C symbols get an underscore after compilation])
	fi

	AC_MSG_RESULT([$grub_cv_asm_uscore])
	])


	dnl Some versions of `objcopy -O binary' vary their output depending
	dnl on the link address.
	AC_DEFUN([grub_PROG_OBJCOPY_ABSOLUTE],
	[AC_MSG_CHECKING([whether ${OBJCOPY} works for absolute addresses])
	AC_CACHE_VAL(grub_cv_prog_objcopy_absolute,
	[cat > conftest.c <<\EOF
	void
	cmain (void)
	{
	((int ) 0x1000) = 2;
	}
	EOF

	if AC_TRY_EVAL(ac_compile) && test -s conftest.o; then :
	else
	AC_MSG_ERROR([${CC-cc} cannot compile C source code])
	fi
	grub_cv_prog_objcopy_absolute=yes
	for link_addr in 2000 8000 7C00; do
	if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -nostdlib -Wl,-Ttext -Wl,$link_addr ${LDFLAGS} conftest.o -o conftest.exec]); then :
	else
	AC_MSG_ERROR([${CC-cc} cannot link at address $link_addr])
	fi
	if AC_TRY_COMMAND([${OBJCOPY-objcopy} -O binary conftest.exec conftest]); then :
	else
	AC_MSG_ERROR([${OBJCOPY-objcopy} cannot create binary files])
	fi
	if test ! -f conftest.old \|\| AC_TRY_COMMAND([cmp -s conftest.old conftest]); then
	mv -f conftest conftest.old
	else
	grub_cv_prog_objcopy_absolute=no
	break
	fi
	done
	rm -f conftest*])
	AC_MSG_RESULT([$grub_cv_prog_objcopy_absolute])])

	dnl Mass confusion!
	dnl Older versions of GAS interpret `.code16' to mean ``generate 32-bit
	dnl instructions, but implicitly insert addr32 and data32 bytes so
	dnl that the code works in real mode''.
	dnl
	dnl Newer versions of GAS interpret `.code16' to mean ``generate 16-bit
	dnl instructions,'' which seems right. This requires the programmer
	dnl to explicitly insert addr32 and data32 instructions when they want
	dnl them.
	dnl
	dnl We only support the newer versions, because the old versions cause
	dnl major pain, by requiring manual assembly to get 16-bit instructions into
	dnl stage1/stage1.S.
	AC_DEFUN([grub_ASM_ADDR32],
	[AC_REQUIRE([AC_PROG_CC])
	AC_REQUIRE([grub_ASM_PREFIX_REQUIREMENT])
	AC_MSG_CHECKING([for .code16 addr32 assembler support])
	AC_CACHE_VAL(grub_cv_asm_addr32,
	[cat > conftest.s.in <<\EOF
	.code16
	l1: @ADDR32@ movb %al, l1
	EOF

	if test "x$grub_cv_asm_prefix_requirement" = xyes; then
	sed -e s/@ADDR32@/addr32/ < conftest.s.in > conftest.s
	else
	sed -e s/@ADDR32@/addr32\;/ < conftest.s.in > conftest.s
	fi

	if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
	grub_cv_asm_addr32=yes
	else
	grub_cv_asm_addr32=no
	fi

	rm -f conftest*])

	AC_MSG_RESULT([$grub_cv_asm_addr32])])

	dnl
	dnl Later versions of GAS requires that addr32 and data32 prefixes
	dnl appear in the same lines as the instructions they modify, while
	dnl earlier versions requires that they appear in separate lines.
	AC_DEFUN([grub_ASM_PREFIX_REQUIREMENT],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING(dnl
	[whether addr32 must be in the same line as the instruction])
	AC_CACHE_VAL(grub_cv_asm_prefix_requirement,
	[cat > conftest.s <<\EOF
	.code16
	l1: addr32 movb %al, l1
	EOF

	if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
	grub_cv_asm_prefix_requirement=yes
	else
	grub_cv_asm_prefix_requirement=no
	fi

	rm -f conftest*])

	if test "x$grub_cv_asm_prefix_requirement" = xyes; then
	grub_tmp_addr32="addr32"
	grub_tmp_data32="data32"
	else
	grub_tmp_addr32="addr32;"
	grub_tmp_data32="data32;"
	fi

	AC_DEFINE_UNQUOTED([ADDR32], $grub_tmp_addr32,
	[Define it to \"addr32\" or \"addr32;\" to make GAS happy])
	AC_DEFINE_UNQUOTED([DATA32], $grub_tmp_data32,
	[Define it to \"data32\" or \"data32;\" to make GAS happy])

	AC_MSG_RESULT([$grub_cv_asm_prefix_requirement])])

	dnl
	dnl Older versions of GAS require that absolute indirect calls/jumps are
	dnl not prefixed with `*', while later versions warn if not prefixed.
	AC_DEFUN([grub_ASM_ABSOLUTE_WITHOUT_ASTERISK],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING(dnl
	[whether an absolute indirect call/jump must not be prefixed with an asterisk])
	AC_CACHE_VAL(grub_cv_asm_absolute_without_asterisk,
	[cat > conftest.s <<\EOF
	lcall *(offset)
	offset:
	.long 0
	.word 0
	EOF

	if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} -c conftest.s]) && test -s conftest.o; then
	grub_cv_asm_absolute_without_asterisk=no
	else
	grub_cv_asm_absolute_without_asterisk=yes
	fi

	rm -f conftest*])

	if test "x$grub_cv_asm_absolute_without_asterisk" = xyes; then
	AC_DEFINE(ABSOLUTE_WITHOUT_ASTERISK, 1, [Define if an absolute indirect call/jump must NOT be prefixed with `*'])
	fi

	AC_MSG_RESULT([$grub_cv_asm_absolute_without_asterisk])])

	dnl
	dnl grub_CHECK_START_SYMBOL checks if start is automatically defined by
	dnl the compiler.
	dnl Written by OKUJI Yoshinori
	AC_DEFUN([grub_CHECK_START_SYMBOL],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING([if start is defined by the compiler])
	AC_CACHE_VAL(grub_cv_check_start_symbol,
	[AC_TRY_LINK([], [asm ("incl start")],
	grub_cv_check_start_symbol=yes,
	grub_cv_check_start_symbol=no)])

	if test "x$grub_cv_check_start_symbol" = xyes; then
	AC_DEFINE(HAVE_START_SYMBOL, 1, [Define if start is defined])
	fi

	AC_MSG_RESULT([$grub_cv_check_start_symbol])
	])

	dnl
	dnl grub_CHECK_USCORE_START_SYMBOL checks if _start is automatically
	dnl defined by the compiler.
	dnl Written by OKUJI Yoshinori
	AC_DEFUN([grub_CHECK_USCORE_START_SYMBOL],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING([if _start is defined by the compiler])
	AC_CACHE_VAL(grub_cv_check_uscore_start_symbol,
	[AC_TRY_LINK([], [asm ("incl _start")],
	grub_cv_check_uscore_start_symbol=yes,
	grub_cv_check_uscore_start_symbol=no)])

	if test "x$grub_cv_check_uscore_start_symbol" = xyes; then
	AC_DEFINE(HAVE_USCORE_START_SYMBOL, 1, [Define if _start is defined])
	fi

	AC_MSG_RESULT([$grub_cv_check_uscore_start_symbol])
	])

	dnl
	dnl grub_CHECK_USCORE_USCORE_BSS_START_SYMBOL checks if __bss_start is
	dnl automatically defined by the compiler.
	dnl Written by Michael Hohmoth.
	AC_DEFUN([grub_CHECK_USCORE_USCORE_BSS_START_SYMBOL],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING([if __bss_start is defined by the compiler])
	AC_CACHE_VAL(grub_cv_check_uscore_uscore_bss_start_symbol,
	[AC_TRY_LINK([], [asm ("incl __bss_start")],
	grub_cv_check_uscore_uscore_bss_start_symbol=yes,
	grub_cv_check_uscore_uscore_bss_start_symbol=no)])

	if test "x$grub_cv_check_uscore_uscore_bss_start_symbol" = xyes; then
	AC_DEFINE(HAVE_USCORE_USCORE_BSS_START_SYMBOL, 1, [Define if __bss_start is defined])
	fi

	AC_MSG_RESULT([$grub_cv_check_uscore_uscore_bss_start_symbol])
	])

	dnl
	dnl grub_CHECK_EDATA_SYMBOL checks if edata is automatically defined by the
	dnl compiler.
	dnl Written by Michael Hohmuth.
	AC_DEFUN([grub_CHECK_EDATA_SYMBOL],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING([if edata is defined by the compiler])
	AC_CACHE_VAL(grub_cv_check_edata_symbol,
	[AC_TRY_LINK([], [asm ("incl edata")],
	grub_cv_check_edata_symbol=yes,
	grub_cv_check_edata_symbol=no)])

	if test "x$grub_cv_check_edata_symbol" = xyes; then
	AC_DEFINE(HAVE_EDATA_SYMBOL, 1, [Define if edata is defined])
	fi

	AC_MSG_RESULT([$grub_cv_check_edata_symbol])
	])

	dnl
	dnl grub_CHECK_USCORE_EDATA_SYMBOL checks if _edata is automatically
	dnl defined by the compiler.
	dnl Written by Michael Hohmuth.
	AC_DEFUN([grub_CHECK_USCORE_EDATA_SYMBOL],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING([if _edata is defined by the compiler])
	AC_CACHE_VAL(grub_cv_check_uscore_edata_symbol,
	[AC_TRY_LINK([], [asm ("incl _edata")],
	grub_cv_check_uscore_edata_symbol=yes,
	grub_cv_check_uscore_edata_symbol=no)])

	if test "x$grub_cv_check_uscore_edata_symbol" = xyes; then
	AC_DEFINE(HAVE_USCORE_EDATA_SYMBOL, 1, [Define if _edata is defined])
	fi

	AC_MSG_RESULT([$grub_cv_check_uscore_edata_symbol])
	])

	dnl
	dnl grub_CHECK_END_SYMBOL checks if end is automatically defined by the
	dnl compiler.
	dnl Written by OKUJI Yoshinori
	AC_DEFUN([grub_CHECK_END_SYMBOL],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING([if end is defined by the compiler])
	AC_CACHE_VAL(grub_cv_check_end_symbol,
	[AC_TRY_LINK([], [asm ("incl end")],
	grub_cv_check_end_symbol=yes,
	grub_cv_check_end_symbol=no)])

	if test "x$grub_cv_check_end_symbol" = xyes; then
	AC_DEFINE(HAVE_END_SYMBOL, 1, [Define if end is defined])
	fi

	AC_MSG_RESULT([$grub_cv_check_end_symbol])
	])

	dnl
	dnl grub_CHECK_USCORE_END_SYMBOL checks if _end is automatically defined
	dnl by the compiler.
	dnl Written by OKUJI Yoshinori
	AC_DEFUN([grub_CHECK_USCORE_END_SYMBOL],
	[AC_REQUIRE([AC_PROG_CC])
	AC_MSG_CHECKING([if _end is defined by the compiler])
	AC_CACHE_VAL(grub_cv_check_uscore_end_symbol,
	[AC_TRY_LINK([], [asm ("incl _end")],
	grub_cv_check_uscore_end_symbol=yes,
	grub_cv_check_uscore_end_symbol=no)])

	if test "x$grub_cv_check_uscore_end_symbol" = xyes; then
	AC_DEFINE(HAVE_USCORE_END_SYMBOL, 1, [Define if end is defined])
	fi

	AC_MSG_RESULT([$grub_cv_check_uscore_end_symbol])
	])

	dnl grub_DEFINE_FILE(MACRO_NAME, FILE_NAME, DESCRIPTION)
	dnl grub_DEFINE_FILE defines a macro as the contents of a file safely.
	dnl Replace some escape sequences, because autoconf doesn't handle them
	dnl gracefully.
	dnl Written by OKUJI Yoshinori.
	AC_DEFUN([grub_DEFINE_FILE],
	[AC_REQUIRE([AC_PROG_CC])
	# Because early versions of GNU sed 3.x are too buggy, use a C program
	# instead of shell commands. sigh
	cat >conftest.c <<\EOF
	#include <stdio.h>

	int
	main (void)
	{
	int c;

	while ((c = getchar ()) != EOF)
	{
	switch (c)
	{
	case '\n':
	fputs ("\\n", stdout);
	break;
	case '\r':
	fputs ("\\r", stdout);
	break;
	case '\\':
	fputs ("\\\\", stdout);
	break;
	case '"':
	fputs ("\\\"", stdout);
	break;
	default:
	putchar (c);
	}
	}

	return 0;
	}
	EOF

	if AC_TRY_COMMAND([${CC-cc} ${CFLAGS} conftest.c -o conftest]) && test -s conftest; then
	grub_tmp_value=`./conftest < "[$2]"`
	else
	AC_MSG_ERROR([${CC-cc} failed to produce an executable file])
	fi

	AC_DEFINE_UNQUOTED([$1], "$grub_tmp_value", [$3])
	rm -f conftest*
	])