cairo/acinclude.m4

dnl -*- mode: autoconf -*-

# serial 1

dnl Usage:
dnl   GTK_DOC_CHECK([minimum-gtk-doc-version])
AC_DEFUN([GTK_DOC_CHECK],
[
  AC_BEFORE([AC_PROG_LIBTOOL],[$0])dnl setup libtool first
  AC_BEFORE([AM_PROG_LIBTOOL],[$0])dnl setup libtool first
  dnl for overriding the documentation installation directory
  AC_ARG_WITH(html-dir,
    AC_HELP_STRING([--with-html-dir=PATH], [path to installed docs]),,
    [with_html_dir='${datadir}/gtk-doc/html'])
  HTML_DIR="$with_html_dir"
  AC_SUBST(HTML_DIR)

  dnl enable/disable documentation building
  AC_ARG_ENABLE(gtk-doc,
    AC_HELP_STRING([--enable-gtk-doc],
                   [use gtk-doc to build documentation [default=no]]),,
    enable_gtk_doc=no)

  have_gtk_doc=no
  if test x$enable_gtk_doc = xyes; then
    if test -z "$PKG_CONFIG"; then
      AC_PATH_PROG(PKG_CONFIG, pkg-config, no)
    fi
    if test "$PKG_CONFIG" != "no" && $PKG_CONFIG --exists gtk-doc; then
      have_gtk_doc=yes
    fi

  dnl do we want to do a version check?
ifelse([$1],[],,
    [gtk_doc_min_version=$1
    if test "$have_gtk_doc" = yes; then
      AC_MSG_CHECKING([gtk-doc version >= $gtk_doc_min_version])
      if $PKG_CONFIG --atleast-version $gtk_doc_min_version gtk-doc; then
        AC_MSG_RESULT(yes)
      else
        AC_MSG_RESULT(no)
        have_gtk_doc=no
      fi
    fi
])
    if test "$have_gtk_doc" != yes; then
      enable_gtk_doc=no
    fi
  fi

  AM_CONDITIONAL(ENABLE_GTK_DOC, test x$enable_gtk_doc = xyes)
  AM_CONDITIONAL(GTK_DOC_USE_LIBTOOL, test -n "$LIBTOOL")
])

# AX_C_FLOAT_WORDS_BIGENDIAN ([ACTION-IF-TRUE], [ACTION-IF-FALSE],
#                             [ACTION-IF-UNKNOWN])
#
# Checks the ordering of words within a multi-word float. This check
# is necessary because on some systems (e.g. certain ARM systems), the
# float word ordering can be different from the byte ordering. In a
# multi-word float context, "big-endian" implies that the word containing
# the sign bit is found in the memory location with the lowest address.
# This implemenation was inspired by the AC_C_BIGENDIAN macro in autoconf.
# -------------------------------------------------------------------------
AC_DEFUN([AX_C_FLOAT_WORDS_BIGENDIAN],
  [AC_CACHE_CHECK(whether float word ordering is bigendian,
                  ax_cv_c_float_words_bigendian, [

# The endianess is detected by first compiling C code that contains a special
# double float value, then grepping the resulting object file for certain
# strings of ascii values. The double is specially crafted to have a
# binary representation that corresponds with a simple string. In this
# implementation, the string "noonsees" was selected because the individual
# word values ("noon" and "sees") are palindromes, thus making this test
# byte-order agnostic. If grep finds the string "noonsees" in the object
# file, the target platform stores float words in big-endian order. If grep
# finds "seesnoon", float words are in little-endian order. If neither value
# is found, the user is instructed to specify the ordering.

ax_cv_c_float_words_bigendian=unknown
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[

double d = 90904234967036810337470478905505011476211692735615632014797120844053488865816695273723469097858056257517020191247487429516932130503560650002327564517570778480236724525140520121371739201496540132640109977779420565776568942592.0;

]])], [

if strings - conftest.$ac_objext | grep noonsees >/dev/null ; then
  ax_cv_c_float_words_bigendian=yes
fi
if strings - conftest.$ac_objext | grep seesnoon >/dev/null ; then
  if test "$ax_cv_c_float_words_bigendian" = unknown; then
    ax_cv_c_float_words_bigendian=no
  else
    ax_cv_c_float_words_bigendian=unknown
  fi
fi

])])

case $ax_cv_c_float_words_bigendian in
  yes)
    m4_default([$1],
      [AC_DEFINE([FLOAT_WORDS_BIGENDIAN], 1,
                 [Define to 1 if your system stores words within floats
                  with the most significant word first])]) ;;
  no)
    $2 ;;
  *)
    m4_default([$3],
      [AC_MSG_ERROR([

Unknown float word ordering. You need to manually preset
ax_cv_c_float_words_bigendian=no (or yes) according to your system.

    ])]) ;;
esac

])# AX_C_FLOAT_WORDS_BIGENDIAN



dnl ==========================================================================
dnl
dnl Cairo-specific macros
dnl
m4_pattern_forbid([CAIRO])
m4_pattern_forbid([^cr_])

dnl ==========================================================================

dnl Usage:
dnl   CAIRO_BIGENDIAN
dnl
AC_DEFUN([CAIRO_BIGENDIAN], [
	case $host_os in
		darwin*)
	AH_VERBATIM([X_BYTE_ORDER],
[
/* Deal with multiple architecture compiles on Mac OS X */
#ifdef __APPLE_CC__
#ifdef __BIG_ENDIAN__
#define WORDS_BIGENDIAN 1
#define FLOAT_WORDS_BIGENDIAN 1
#else
#undef WORDS_BIGENDIAN
#undef FLOAT_WORDS_BIGENDIAN
#endif
#endif
])
		;;
		*) 
	AC_C_BIGENDIAN
	AX_C_FLOAT_WORDS_BIGENDIAN
		;;
	esac
])

dnl CAIRO_CHECK_FUNCS_WITH_FLAGS(FUNCTION..., CFLAGS, LIBS
dnl                              [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
dnl Like AC_CHECK_FUNCS but with additional CFLAGS and LIBS
dnl --------------------------------------------------------------------
AC_DEFUN([CAIRO_CHECK_FUNCS_WITH_FLAGS],
[ 
	_save_cflags="$CFLAGS"
	_save_libs="$LIBS"
	CFLAGS="$CFLAGS $2"
	LIBS="$LIBS $3"
	AC_CHECK_FUNCS($1, $4, $5)
	CFLAGS="$_save_cflags"
	LIBS="$_save_libs"
])

dnl CAIRO_CONFIG_COMMANDS is like AC_CONFIG_COMMANDS, except that:
dnl
dnl	1) It redirects the stdout of the command to the file.
dnl	2) It does not recreate the file if contents didn't change.
dnl
AC_DEFUN([CAIRO_CONFIG_COMMANDS],
[
	AC_CONFIG_COMMANDS($1,
	[
		_config_file=$1
		_tmp_file=cairoconf.tmp
		AC_MSG_NOTICE([creating $_config_file])
		{
			$2
		} >> "$_tmp_file" ||
	        AC_MSG_ERROR([failed to write to $_tmp_file])

		if cmp -s "$_tmp_file" "$_config_file"; then
		  AC_MSG_NOTICE([$_config_file is unchanged])
		  rm -f "$_tmp_file"
		else
		  mv "$_tmp_file" "$_config_file" ||
	          AC_MSG_ERROR([failed to update $_config_file])
		fi
	], $3)
])

dnl check compiler flags
AC_DEFUN([CAIRO_CC_TRY_FLAG],
[
	AC_MSG_CHECKING([whether $CC supports $1])

	_save_cflags="$CFLAGS"
	CFLAGS="$CFLAGS -Werror $1"
	AC_COMPILE_IFELSE([ ], [cairo_cc_flag=yes], [cairo_cc_flag=no])
	CFLAGS="$_save_cflags"

	if test "x$cairo_cc_flag" = "xyes"; then
		ifelse([$2], , :, [$2])
	else
		ifelse([$3], , :, [$3])
	fi
	AC_MSG_RESULT([$cairo_cc_flag])
])

dnl Usage:
dnl   CAIRO_CHECK_NATIVE_ATOMIC_PRIMITIVES
AC_DEFUN([CAIRO_CHECK_NATIVE_ATOMIC_PRIMITIVES],
[
	AC_CACHE_CHECK([for native atomic primitives], cairo_cv_atomic_primitives,
	[
		cairo_cv_atomic_primitives="none"

		AC_TRY_LINK([int atomic_add(int i) { return __sync_fetch_and_add (&i, 1); }], [],
		  cairo_cv_atomic_primitives="Intel"
		  )
	])
	if test "x$cairo_cv_atomic_primitives" = xIntel; then
		AC_DEFINE(HAVE_INTEL_ATOMIC_PRIMITIVES, 1,
			  [Enable if your compiler supports the Intel __sync_* atomic primitives])
	fi
])

dnl Usage:
dnl   CAIRO_CHECK_ATOMIC_OP_NEEDS_MEMORY_BARRIER
AC_DEFUN([CAIRO_CHECK_ATOMIC_OP_NEEDS_MEMORY_BARRIER],
[
	AC_CACHE_CHECK([whether atomic ops require a memory barrier], cairo_cv_atomic_op_needs_memory_barrier,
	[
		case $host_cpu in
		    i?86)	cairo_cv_atomic_op_needs_memory_barrier="no"  ;;
		    x86_64)	cairo_cv_atomic_op_needs_memory_barrier="no"  ;;
		    arm*)	cairo_cv_atomic_op_needs_memory_barrier="no"  ;;
		    *)		cairo_cv_atomic_op_needs_memory_barrier="yes" ;;
		esac
	])
	if test "x$cairo_cv_atomic_op_needs_memory_barrier" = "xyes"; then
	    AC_DEFINE_UNQUOTED(ATOMIC_OP_NEEDS_MEMORY_BARRIER, 1,
			       [whether memory barriers are needed around atomic operations])
	fi
])

dnl Parse Version.mk and declare m4 variables out of it
m4_define([CAIRO_PARSE_VERSION],
		m4_translit(
		m4_bpatsubst(m4_include(cairo-version.h),
			     [^.define \([a-zA-Z0-9_]*\)  *\([0-9][0-9]*\)],
			     [[m4_define(\1, \[\2\])]]),
			    [A-Z], [a-z])
)