# Process this file with autoconf to produce a configure script.

# Copyright (C) 2002,2003,2004,2005,2006,2007  Free Software Foundation, Inc.
#
# This configure.ac is free software; the author
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
# PARTICULAR PURPOSE.

dnl This configure script is complicated, because GRUB needs to deal
dnl with three potentially different types:
dnl
dnl   build  -- the environment for building GRUB
dnl   host   -- the environment for running utilities
dnl   target -- the environment for running GRUB
dnl
dnl In addition, GRUB needs to deal with a platform specification
dnl which specifies the system running GRUB, such as firmware.
dnl This is necessary because the target type in autoconf does not
dnl describe such a system very well.
dnl
dnl The current strategy is to use variables with no prefix (such as
dnl CC, CFLAGS, etc.) for the host type as well as the build type,
dnl because GRUB does not need to use those variables for the build
dnl type, so there is no conflict. Variables with the prefix "TARGET_"
dnl (such as TARGET_CC, TARGET_CFLAGS, etc.) are used for the target
dnl type.


AC_INIT(GRUB, 1.95, [bug-grub@gnu.org])
AC_PREREQ(2.53)
AC_CONFIG_SRCDIR([include/grub/dl.h])
AC_CONFIG_HEADER([config.h])

# Checks for host and target systems.
AC_CANONICAL_HOST
AC_CANONICAL_TARGET

# Program name transformations
AC_ARG_PROGRAM

case "$host_cpu" in
  powerpc64) host_m32=1 ;;
esac

case "$target_cpu" in
  i[[3456]]86) target_cpu=i386 ;;
  x86_64) target_cpu=i386 target_m32=1 ;;
  powerpc) ;;
  powerpc64) target_cpu=powerpc target_m32=1;;
  sparc64) ;;
  *) AC_MSG_ERROR([unsupported CPU type]) ;;
esac

# Specify the platform (such as firmware).
AC_ARG_WITH([platform],
            AS_HELP_STRING([--with-platform=PLATFORM],
                           [select the host platform [[guessed]]]))

# Guess the platform if not specified.
if test "x$with_platform" = x; then
  case "$target_cpu"-"$target_vendor" in
    i386-apple) platform=efi ;;
    i386-*) platform=pc ;;
    powerpc-*) platform=ieee1275 ;;
    sparc64-*) platform=ieee1275 ;;
    *) AC_MSG_ERROR([unsupported machine type]) ;;
  esac
else
  platform="$with_platform"
fi

# Sanity check.
case "$target_cpu"-"$platform" in
  i386-efi) ;;
  i386-pc) ;;
  i386-linuxbios) ;;
  powerpc-ieee1275) ;;
  sparc64-ieee1275) ;;
  *) AC_MSG_ERROR([unsupported machine type]) ;;
esac

AC_SUBST(target_cpu)
AC_SUBST(platform)

#
# Checks for build programs.
#

# Although cmp is listed in the GNU Coding Standards as a command which
# can used directly, OpenBSD lacks cmp in the default installation.
AC_CHECK_PROGS([CMP], [cmp])
if test "x$CMP" = x; then
  AC_MSG_ERROR([cmp is not found])
fi

AC_CHECK_PROGS([YACC], [bison])
if test "x$YACC" = x; then
  AC_MSG_ERROR([bison is not found])
fi

AC_PROG_INSTALL
AC_PROG_AWK
AC_PROG_MAKE_SET

# This is not a "must".
AC_PATH_PROG(RUBY, ruby)

#
# Checks for host programs.
#

AC_PROG_CC
# Must be GCC.
test "x$GCC" = xyes || AC_MSG_ERROR([GCC is required])

AC_GNU_SOURCE
AC_SYS_LARGEFILE

# Identify characteristics of the host architecture.
AC_C_BIGENDIAN
AC_CHECK_SIZEOF(void *)
AC_CHECK_SIZEOF(long)

if test "x$host_m32" = x1; then
  # Force 32-bit mode.
  CFLAGS="$CFLAGS -m32"
  LDFLAGS="$LDFLAGS -m32"
fi

# Check LZO when compiling for the i386-pc.
if test "$target_cpu"-"$platform" = i386-pc; then
  # There are three possibilities. LZO version 2 installed with the name
  # liblzo2, with the name liblzo, and LZO version 1.
  AC_CHECK_LIB(lzo2, __lzo_init_v2, [LIBLZO="-llzo2"],
    AC_CHECK_LIB(lzo, __lzo_init_v2, [LIBLZO="-llzo"],
      AC_CHECK_LIB(lzo, __lzo_init2, [LIBLZO="-llzo"],
	       AC_MSG_ERROR([LZO library version 1.02 or later is required]))))
  AC_SUBST(LIBLZO)
  LIBS="$LIBS $LIBLZO"
  AC_CHECK_FUNC(lzo1x_999_compress, , 
	        [AC_MSG_ERROR([LZO1X-999 must be enabled])])

  # LZO version 2 uses lzo/lzo1x.h, while LZO version 1 uses lzo1x.h.
  AC_CHECK_HEADERS(lzo/lzo1x.h lzo1x.h)
fi

# Check for functions.
AC_CHECK_FUNCS(posix_memalign memalign)

#
# Check for target programs.
#

# For cross-compiling.
if test "x$target" != "x$host"; then
  # XXX this depends on the implementation of autoconf!
  tmp_ac_tool_prefix="$ac_tool_prefix"
  ac_tool_prefix=$target_alias-

  AC_CHECK_TOOLS(TARGET_CC, [gcc egcs cc],
                 [AC_MSG_ERROR([none of gcc, egcs and cc is found. set TARGET_CC manually.])])
  AC_CHECK_TOOL(OBJCOPY, objcopy)
  AC_CHECK_TOOL(STRIP, strip)
  AC_CHECK_TOOL(NM, nm)

  ac_tool_prefix="$tmp_ac_tool_prefix"
else
  if test "x$TARGET_CC" = x; then
    TARGET_CC=$CC
  fi
  AC_CHECK_TOOL(OBJCOPY, objcopy)
  AC_CHECK_TOOL(STRIP, strip)
  AC_CHECK_TOOL(NM, nm)
fi
AC_SUBST(TARGET_CC)


# Test the C compiler for the target environment.
tmp_CC="$CC"
tmp_CFLAGS="$CFLAGS"
tmp_LDFLAGS="$LDFLAGS"
tmp_CPPFLAGS="$CPPFLAGS"
tmp_LIBS="$LIBS"
CC="$TARGET_CC"
CFLAGS="$TARGET_CFLAGS"
CPPFLAGS="$TARGET_CPPFLAGS"
LDFLAGS="$TARGET_LDFLAGS"
LIBS=""

if test "x$TARGET_CFLAGS" = x; then
  # debug flags.
  TARGET_CFLAGS="-Wall -W -Wshadow -Wpointer-arith -Wmissing-prototypes \
                 -Wundef -Wstrict-prototypes -g"

  # optimization flags.
  AC_CACHE_CHECK([whether optimization for size works], size_flag, [
    CFLAGS=-Os
    AC_TRY_COMPILE(, , size_flag=yes, size_flag=no)
  ])
  if test "x$size_flag" = xyes; then
    TARGET_CFLAGS="$TARGET_CFLAGS -Os"
  else
    TARGET_CFLAGS="$TARGET_CFLAGS -O2 -fno-strength-reduce -fno-unroll-loops"
  fi

  # Force no alignment to save space on i386.
  if test "x$target_cpu" = xi386; then
    AC_CACHE_CHECK([whether -falign-loops works], [falign_loop_flag], [
      CFLAGS="-falign-loops=1"
      AC_TRY_COMPILE(, , [falign_loop_flag=yes], [falign_loop_flag=no])
    ])

    if test "x$falign_loop_flag" = xyes; then
      TARGET_CFLAGS="$TARGET_CFLAGS -falign-jumps=1 -falign-loops=1 -falign-functions=1"
    else
      TARGET_CFLAGS="$TARGET_CFLAGS -malign-jumps=1 -malign-loops=1 -malign-functions=1"
    fi
  fi
fi

if test "x$target_m32" = x1; then
  # Force 32-bit mode.
  TARGET_CFLAGS="$TARGET_CFLAGS -m32"
  TARGET_LDFLAGS="$TARGET_LDFLAGS -m32"
fi

AC_MSG_CHECKING([whether the linker accepts `--build-id=none'])
save_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -Wl,--build-id=none"
AC_TRY_LINK(, , build_id_flag=yes, build_id_flag=no)
AC_MSG_RESULT([$build_id_flag])
LDFLAGS="$save_LDFLAGS"
if test "x$build_id_flag" = xyes; then
  TARGET_LDFLAGS="$TARGET_LDFLAGS -Wl,--build-id=none"
fi

#
# Compiler features.
#

# Smashing stack protector.
grub_CHECK_STACK_PROTECTOR
[# Need that, because some distributions ship compilers that include
# `-fstack-protector' in the default specs.
if [ x"$ssp_possible" = xyes ]; then
  TARGET_CFLAGS=$TARGET_CFLAGS\ -fno-stack-protector
fi]

AC_SUBST(TARGET_CFLAGS)
AC_SUBST(TARGET_CPPFLAGS)
AC_SUBST(TARGET_LDFLAGS)

# Set them to their new values for the tests below.
CC="$TARGET_CC"
CFLAGS="$TARGET_CFLAGS"
CPPFLAGS="$TARGET_CPPFLAGS"
LDFLAGS="$TARGET_LDFLAGS"

# Defined in aclocal.m4.
grub_PROG_OBJCOPY_ABSOLUTE
grub_ASM_USCORE
if test "x$target_cpu" = xi386; then
  grub_CHECK_START_SYMBOL
  grub_CHECK_BSS_START_SYMBOL
  grub_CHECK_END_SYMBOL
  grub_I386_ASM_PREFIX_REQUIREMENT
  grub_I386_ASM_ADDR32
  grub_I386_ASM_ABSOLUTE_WITHOUT_ASTERISK
  grub_I386_CHECK_REGPARM_BUG
else
  AC_DEFINE([NESTED_FUNC_ATTR], [], [Catch gcc bug])
fi

# Restore the flags.
CC="$tmp_CC"
CFLAGS="$tmp_CFLAGS"
CPPFLAGS="$tmp_CPPFLAGS"
LDFLAGS="$tmp_LDFLAGS"
LIBS="$tmp_LIBS"

#
# Check for options.
#

# Memory manager debugging.
AC_ARG_ENABLE([mm-debug], 
	      AS_HELP_STRING([--enable-mm-debug],
                             [include memory manager debugging]),
              [AC_DEFINE([MM_DEBUG], [1],
                         [Define to 1 if you enable memory manager debugging.])])

AC_ARG_ENABLE([grub-emu],
	      [AS_HELP_STRING([--enable-grub-emu],
                             [build and install the `grub-emu' debugging utility])])
[if [ x"$enable_grub_emu" = xyes ]; then
  # Check for curses libraries.]
  AC_CHECK_LIB([ncurses], [wgetch], [LIBCURSES="-lncurses"],
    [AC_CHECK_LIB([curses], [wgetch], [LIBCURSES="-lcurses"],
      [AC_MSG_ERROR([(n)curses libraries are required to build `grub-emu'])])])
  AC_SUBST([LIBCURSES])

  [# Check for headers.]
  AC_CHECK_HEADERS([ncurses/curses.h], [],
    [AC_CHECK_HEADERS([ncurses.h], [],
      [AC_CHECK_HEADERS([curses.h], [],
	[AC_MSG_ERROR([(n)curses header files are required to build `grub-emu'])])])])
[fi]
AC_SUBST([enable_grub_emu])

# Output files.
AC_CONFIG_LINKS([include/grub/cpu:include/grub/$target_cpu
	include/grub/machine:include/grub/$target_cpu/$platform])
AC_CONFIG_FILES([Makefile gensymlist.sh genkernsyms.sh])
AC_CONFIG_FILES([stamp-h], [echo timestamp > stamp-h])
AC_OUTPUT