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

Pull kbuild updates from Michal Marek:

 - EXPORT_SYMBOL for asm source by Al Viro.

   This does bring a regression, because genksyms no longer generates
   checksums for these symbols (CONFIG_MODVERSIONS). Nick Piggin is
   working on a patch to fix this.

   Plus, we are talking about functions like strcpy(), which rarely
   change prototypes.

 - Fixes for PPC fallout of the above by Stephen Rothwell and Nick
   Piggin

 - fixdep speedup by Alexey Dobriyan.

 - preparatory work by Nick Piggin to allow architectures to build with
   -ffunction-sections, -fdata-sections and --gc-sections

 - CONFIG_THIN_ARCHIVES support by Stephen Rothwell

 - fix for filenames with colons in the initramfs source by me.

* 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild: (22 commits)
  initramfs: Escape colons in depfile
  ppc: there is no clear_pages to export
  powerpc/64: whitelist unresolved modversions CRCs
  kbuild: -ffunction-sections fix for archs with conflicting sections
  kbuild: add arch specific post-link Makefile
  kbuild: allow archs to select link dead code/data elimination
  kbuild: allow architectures to use thin archives instead of ld -r
  kbuild: Regenerate genksyms lexer
  kbuild: genksyms fix for typeof handling
  fixdep: faster CONFIG_ search
  ia64: move exports to definitions
  sparc32: debride memcpy.S a bit
  [sparc] unify 32bit and 64bit string.h
  sparc: move exports to definitions
  ppc: move exports to definitions
  arm: move exports to definitions
  s390: move exports to definitions
  m68k: move exports to definitions
  alpha: move exports to actual definitions
  x86: move exports to actual definitions
  ...

1 files changed, 60 insertions, 11 deletions

diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 4f727eb5ec43..f742c65108b9 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -37,12 +37,40 @@ info()
         fi
 }
 
+# Thin archive build here makes a final archive with
+# symbol table and indexes from vmlinux objects, which can be
+# used as input to linker.
+#
+# Traditional incremental style of link does not require this step
+#
+# built-in.o output file
+#
+archive_builtin()
+{
+        if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
+                info AR built-in.o
+                rm -f built-in.o;
+                ${AR} rcsT${KBUILD_ARFLAGS} built-in.o                  \
+                                        ${KBUILD_VMLINUX_INIT}          \
+                                        ${KBUILD_VMLINUX_MAIN}
+        fi
+}
+
 # Link of vmlinux.o used for section mismatch analysis
 # ${1} output file
 modpost_link()
 {
-        ${LD} ${LDFLAGS} -r -o ${1} ${KBUILD_VMLINUX_INIT}                   \
-                --start-group ${KBUILD_VMLINUX_MAIN} --end-group
+        local objects
+
+        if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
+                objects="--whole-archive built-in.o"
+        else
+                objects="${KBUILD_VMLINUX_INIT}                         \
+                        --start-group                                   \
+                        ${KBUILD_VMLINUX_MAIN}                          \
+                        --end-group"
+        fi
+        ${LD} ${LDFLAGS} -r -o ${1} ${objects}
 }
 
 # Link of vmlinux
@@ -51,18 +79,36 @@ modpost_link()
 vmlinux_link()
 {
         local lds="${objtree}/${KBUILD_LDS}"
+        local objects
 
         if [ "${SRCARCH}" != "um" ]; then
-                ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2}                  \
-                        -T ${lds} ${KBUILD_VMLINUX_INIT}                     \
-                        --start-group ${KBUILD_VMLINUX_MAIN} --end-group ${1}
+                if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
+                        objects="--whole-archive built-in.o ${1}"
+                else
+                        objects="${KBUILD_VMLINUX_INIT}                 \
+                                --start-group                           \
+                                ${KBUILD_VMLINUX_MAIN}                  \
+                                --end-group                             \
+                                ${1}"
+                fi
+
+                ${LD} ${LDFLAGS} ${LDFLAGS_vmlinux} -o ${2}             \
+                        -T ${lds} ${objects}
         else
-                ${CC} ${CFLAGS_vmlinux} -o ${2}                              \
-                        -Wl,-T,${lds} ${KBUILD_VMLINUX_INIT}                 \
-                        -Wl,--start-group                                    \
-                                 ${KBUILD_VMLINUX_MAIN}                      \
-                        -Wl,--end-group                                      \
-                        -lutil -lrt -lpthread ${1}
+                if [ -n "${CONFIG_THIN_ARCHIVES}" ]; then
+                        objects="-Wl,--whole-archive built-in.o ${1}"
+                else
+                        objects="${KBUILD_VMLINUX_INIT}                 \
+                                -Wl,--start-group                       \
+                                ${KBUILD_VMLINUX_MAIN}                  \
+                                -Wl,--end-group                         \
+                                ${1}"
+                fi
+
+                ${CC} ${CFLAGS_vmlinux} -o ${2}                         \
+                        -Wl,-T,${lds}                                   \
+                        ${objects}                                      \
+                        -lutil -lrt -lpthread
                 rm -f linux
         fi
 }
@@ -119,6 +165,7 @@ cleanup()
         rm -f .tmp_kallsyms*
         rm -f .tmp_version
         rm -f .tmp_vmlinux*
+        rm -f built-in.o
         rm -f System.map
         rm -f vmlinux
         rm -f vmlinux.o
@@ -162,6 +209,8 @@ case "${KCONFIG_CONFIG}" in
         . "./${KCONFIG_CONFIG}"
 esac
 
+archive_builtin
+
 #link vmlinux.o
 info LD vmlinux.o
 modpost_link vmlinux.o