From f634a711c1ba2f33b7d5bdfcb36be926448ccf4b Mon Sep 17 00:00:00 2001
From: David Schleef <ds@schleef.org>
Date: Thu, 7 Aug 2003 01:01:21 +0000
Subject: [PATCH] m4 macros for a bunch of Linux ops

---
 m4/linux.m4 | 186 +++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 185 insertions(+), 1 deletion(-)

diff --git a/m4/linux.m4 b/m4/linux.m4
index 01a51e95..eb84b33c 100644
--- a/m4/linux.m4
+++ b/m4/linux.m4
@@ -1,3 +1,187 @@
 
-# Holder for future Linux macro
+
+AC_DEFUN(DS_LINUX_DIR,
+  [AC_ARG_WITH([linuxdir],
+    [AC_HELP_STRING([--with-linuxdir],
+      [specify path to Linux source directory])],
+    [LINUX_DIR="${withval}"],
+    [LINUX_DIR=default])
+
+  if test "${LINUX_DIR}" != "default" ; then
+    DS_TRY_LINUX_DIR(${LINUX_DIR}, , AC_MSG_ERROR("not found") )
+  fi
+
+  if test "${LINUX_DIR}" = "default" ; then
+    dir="/lib/modules/`uname -r`/build";
+    DS_TRY_LINUX_DIR(${dir}, LINUX_DIR=${dir}, )
+  fi
+  if test "${LINUX_DIR}" = "default" ; then
+    dir="../linux";
+    DS_TRY_LINUX_DIR(${dir}, LINUX_DIR=${dir}, )
+  fi
+  if test "${LINUX_DIR}" = "default" ; then
+    dir="/usr/src/linux";
+    DS_TRY_LINUX_DIR(${dir}, LINUX_DIR=${dir}, )
+  fi
+
+  if test "${LINUX_DIR}" = "default" ; then
+    AC_MSG_ERROR(Linux source directory not found)
+  fi
+
+  AC_SUBST(LINUX_DIR)
+])
+
+AC_DEFUN(DS_TRY_LINUX_DIR,
+  [AC_MSG_CHECKING(for Linux in $1)
+
+  if test -f "$1/Makefile" ; then
+    result=yes
+    $2
+  else
+    result="not found"
+    $3
+  fi
+
+  AC_MSG_RESULT($result)
+])
+
+AC_DEFUN(DS_LINUX_2_6,
+[
+  DS_LINUX_DIR()
+  AC_MSG_CHECKING(for Linux CFLAGS)
+
+  tmpdir="`pwd`/tmp-noicrwa"
+
+  rm -rf ${tmpdir}
+  mkdir ${tmpdir}
+  
+  cat >${tmpdir}/Makefile <<EOF
+obj-m += fake.o
+
+\$(obj)/fake.c: flags
+	touch \$(obj)/fake.c
+
+.PHONY: flags
+flags:
+	echo LINUX_ARCH=\"\$(ARCH)\" >>\$(obj)/flags
+	echo LINUX_AFLAGS=\"\$(AFLAGS)\" | sed 's_Iinclude_I"\$(LINUXDIR)/include"_g'>>\$(obj)/flags
+	echo LINUX_LDFLAGS=\"\" >>\$(obj)/flags
+	echo LINUX_ARFLAGS=\"\$(ARFLAGS)\" >>\$(obj)/flags
+	echo LINUX_CROSS_COMPILE=\"\$(CROSS_COMPILE)\" >>\$(obj)/flags
+	echo LINUX_KERNELRELEASE=\"\$(KERNELRELEASE)\" >>\$(obj)/flags
+	echo LINUX_CFLAGS=\"\$(CFLAGS)\" | sed 's_Iinclude_I"\$(LINUXDIR)/include"_g'>>\$(obj)/flags
+	echo LINUX_CC=\"\$(CC)\" >>\$(obj)/flags
+	echo LINUX_LD=\"\$(LD) \$(LDFLAGS)\" >>\$(obj)/flags
+	echo LINUX_AS=\"\$(AS)\" >>\$(obj)/flags
+EOF
+
+  echo make -C ${LINUX_DIR} V=1 SUBDIRS=${tmpdir} LINUXDIR=${LINUX_DIR} MODVERDIR=${tmpdir} modules >&5 2>&5
+  make -C ${LINUX_DIR} V=1 SUBDIRS=${tmpdir} LINUXDIR=${LINUX_DIR} MODVERDIR=${tmpdir} modules >&5 2>&5
+  . ${tmpdir}/flags
+  rm -rf ${tmpdir}
+
+  LINUX_MODULE_EXT=".ko"
+
+  AC_SUBST(LINUX_ARCH)
+  AC_SUBST(LINUX_AFLAGS)
+  AC_SUBST(LINUX_LDFLAGS)
+  AC_SUBST(LINUX_ARFLAGS)
+  AC_SUBST(LINUX_CROSS_COMPILE)
+  AC_SUBST(LINUX_KERNELRELEASE)
+  AC_SUBST(LINUX_CFLAGS)
+  AC_SUBST(LINUX_CC)
+  AC_SUBST(LINUX_LD)
+  AC_SUBST(LINUX_AS)
+  AC_SUBST(LINUX_MODULE_EXT)
+
+  AC_MSG_RESULT([ok])
+])
+
+
+AC_DEFUN(DS_LINUX_2_4,
+[
+  DS_LINUX_DIR()
+  AC_MSG_CHECKING(for Linux CFLAGS)
+
+  tmpdir="`pwd`/tmp-noicrwa"
+
+  rm -rf ${tmpdir}
+  mkdir ${tmpdir}
+  
+  cat >${tmpdir}/Makefile <<EOF
+
+.PHONY: modules
+modules:
+	echo LINUX_ARCH=\"\$(ARCH)\" >>flags
+	echo LINUX_AFLAGS=\"\$(AFLAGS)\" | sed 's_Iinclude_I\"\$(LINUXDIR)/include\"_g'>>flags
+	echo LINUX_LDFLAGS=\"\" >>flags
+	echo LINUX_ARFLAGS=\"\$(ARFLAGS)\" >>flags
+	echo LINUX_CROSS_COMPILE=\"\$(CROSS_COMPILE)\" >>flags
+	echo LINUX_KERNELRELEASE=\"\$(KERNELRELEASE)\" >>flags
+	echo LINUX_CFLAGS=\"\$(CFLAGS)\" | sed 's_Iinclude_I\"\$(LINUXDIR)/include\"_g'>>flags
+	echo LINUX_CC=\"\$(CC)\" >>flags
+	echo LINUX_LD=\"\$(LD) \$(LDFLAGS)\" >>flags
+	echo LINUX_AS=\"\$(AS)\" >>flags
+EOF
+
+  echo make -C ${LINUX_DIR} SUBDIRS=${tmpdir} modules >&5 2>&5
+  make -C ${LINUX_DIR} SUBDIRS=${tmpdir} modules >&5 2>&5
+  . ${tmpdir}/flags
+  rm -rf ${tmpdir}
+
+  LINUX_MODULE_EXT=".o"
+
+  AC_SUBST(LINUX_ARCH)
+  AC_SUBST(LINUX_AFLAGS)
+  AC_SUBST(LINUX_LDFLAGS)
+  AC_SUBST(LINUX_ARFLAGS)
+  AC_SUBST(LINUX_CROSS_COMPILE)
+  AC_SUBST(LINUX_KERNELRELEASE)
+  AC_SUBST(LINUX_CFLAGS)
+  AC_SUBST(LINUX_CC)
+  AC_SUBST(LINUX_LD)
+  AC_SUBST(LINUX_AS)
+  AC_SUBST(LINUX_MODULE_EXT)
+
+  AC_MSG_RESULT([ok])
+])
+
+AC_DEFUN(DS_CHECK_LINUX_CONFIG_OPTION,
+[
+  AC_MSG_CHECKING([Linux config option $1])
+
+  if grep '^$1=y$' ${LINUX_DIR}/.config >/dev/null 2>/dev/null; then
+    result=yes
+    $2
+  else if grep '^$1=m$' ${LINUX_DIR}/.config >/dev/null 2>/dev/null; then
+    result=module
+    $3
+  else
+    result=no
+    $4
+  fi
+  fi
+
+  AC_MSG_RESULT([$result])
+])
+
+AC_DEFUN(DS_LINUX_CONFIG_OPTION,
+[
+  DS_CHECK_LINUX_CONFIG_OPTION([$1],
+    [$1=yes],
+    [$1=module],
+    [$1=no])
+
+  AM_CONDITIONAL([$1],[test "${$1}" = yes])
+])
+
+AC_DEFUN(DS_LINUX_CONFIG_OPTION_MODULE,
+[
+  DS_CHECK_LINUX_CONFIG_OPTION([$1],
+    [$1=yes],
+    [$1=module],
+    [$1=no])
+
+  AM_CONDITIONAL([$1],[test "${$1}" = yes -o "${$1}" = module])
+])
 
-- 
2.26.2