Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

Pull kbuild updates from Michal Marek:
 - make clean also considers $(extra-m) and $(extra-) to be consistent
 - cleanup and fixes in scripts/Makefile.host
 - allow to override the name of the Python 2 executable with make
   PYTHON=... (only needed for ia64 in practice)
 - option to split debugingo into *.dwo files to save disk space if the
   compiler supports it (CONFIG_DEBUG_INFO_SPLIT)
 - option to use dwarf4 debuginfo if the compiler supports it
   (CONFIG_DEBUG_INFO_DWARF4)
 - fix for disabling certain warnings with clang
 - fix for unneeded rebuild with dash when a command contains
   backslashes

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild:
  kbuild: Fix handling of backslashes in *.cmd files
  kbuild, LLVMLinux: Supress warnings unless W=1-3
  Kbuild: Add a option to enable dwarf4 v2
  kbuild: Support split debug info v4
  kbuild: allow to override Python command name
  kbuild: clean-up and bug fix of scripts/Makefile.host
  kbuild: clean up scripts/Makefile.host
  kbuild: drop shared library support from Makefile.host
  kbuild: fix a bug of C++ host program handling
  kbuild: fix a typo in scripts/Makefile.host
  scripts/Makefile.clean: clean also $(extra-m) and $(extra-)

1 files changed, 8 insertions, 31 deletions

diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index c600e2f44a62..764f5991a3fc 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -23,11 +23,10 @@ This document describes the Linux kernel Makefiles.
         === 4 Host Program support
            --- 4.1 Simple Host Program
            --- 4.2 Composite Host Programs
-           --- 4.3 Defining shared libraries
-           --- 4.4 Using C++ for host programs
-           --- 4.5 Controlling compiler options for host programs
-           --- 4.6 When host programs are actually built
-           --- 4.7 Using hostprogs-$(CONFIG_FOO)
+           --- 4.3 Using C++ for host programs
+           --- 4.4 Controlling compiler options for host programs
+           --- 4.5 When host programs are actually built
+           --- 4.6 Using hostprogs-$(CONFIG_FOO)
 
         === 5 Kbuild clean infrastructure
 
@@ -643,29 +642,7 @@ Both possibilities are described in the following.
         Finally, the two .o files are linked to the executable, lxdialog.
         Note: The syntax <executable>-y is not permitted for host-programs.
 
---- 4.3 Defining shared libraries
-
-        Objects with extension .so are considered shared libraries, and
-        will be compiled as position independent objects.
-        Kbuild provides support for shared libraries, but the usage
-        shall be restricted.
-        In the following example the libkconfig.so shared library is used
-        to link the executable conf.
-
-        Example:
-                #scripts/kconfig/Makefile
-                hostprogs-y     := conf
-                conf-objs       := conf.o libkconfig.so
-                libkconfig-objs := expr.o type.o
-
-        Shared libraries always require a corresponding -objs line, and
-        in the example above the shared library libkconfig is composed by
-        the two objects expr.o and type.o.
-        expr.o and type.o will be built as position independent code and
-        linked as a shared library libkconfig.so. C++ is not supported for
-        shared libraries.
-
---- 4.4 Using C++ for host programs
+--- 4.3 Using C++ for host programs
 
         kbuild offers support for host programs written in C++. This was
         introduced solely to support kconfig, and is not recommended
@@ -688,7 +665,7 @@ Both possibilities are described in the following.
                 qconf-cxxobjs := qconf.o
                 qconf-objs    := check.o
 
---- 4.5 Controlling compiler options for host programs
+--- 4.4 Controlling compiler options for host programs
 
         When compiling host programs, it is possible to set specific flags.
         The programs will always be compiled utilising $(HOSTCC) passed
@@ -716,7 +693,7 @@ Both possibilities are described in the following.
         When linking qconf, it will be passed the extra option
         "-L$(QTDIR)/lib".
 
---- 4.6 When host programs are actually built
+--- 4.5 When host programs are actually built
 
         Kbuild will only build host-programs when they are referenced
         as a prerequisite.
@@ -747,7 +724,7 @@ Both possibilities are described in the following.
         This will tell kbuild to build lxdialog even if not referenced in
         any rule.
 
---- 4.7 Using hostprogs-$(CONFIG_FOO)
+--- 4.6 Using hostprogs-$(CONFIG_FOO)
 
         A typical pattern in a Kbuild file looks like this: