linux-libc-headers: fix headers install in long path name environments

If a build is started in a deep directory structure, or in a path with
long directory names the installation of linux-libc-headers will fail
with:

  | make[2]: execvp: /bin/sh: Argument list too long
  | make[2]: ***

>From within the kernel Makefiles themselves.

The solution is to patch the kernel build rules with the following
change:

[
    scripts/Makefile.headersinst: install headers from scratch file

    If headers_install is executed from a deep/long directory structure, the
    shell's maximum argument length can be execeeded, which breaks the operation
    with:

    | make[2]: execvp: /bin/sh: Argument list too long
    | make[2]: ***

    By dumping the input files to a scratch file and using xargs to read the
    input list from the scratch file, we can avoid blowing out the maximum
    argument size and install headers in a long path name environment.
]

Until this change, or a similar one, is merged into the mainline kernel, this
change should be applied to any 3.7 or greater libc-headers build.

Upstream-status: Pending

(From OE-Core rev: 1e63a3b7b7915d40bb59976a02b9f53968997ed3)

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 51 insertions, 0 deletions

diff --git a/meta/recipes-kernel/linux-libc-headers/linux-libc-headers/scripts-Makefile.headersinst-install-headers-from-sc.patch b/meta/recipes-kernel/linux-libc-headers/linux-libc-headers/scripts-Makefile.headersinst-install-headers-from-sc.patch
new file mode 100644
index 0000000000..be1ef2502f
--- /dev/null
+++ b/meta/recipes-kernel/linux-libc-headers/linux-libc-headers/scripts-Makefile.headersinst-install-headers-from-sc.patch
@@ -0,0 +1,47 @@
+From e60cc1b011bf0f1acdb7e5168b7bed4ebb78c91f Mon Sep 17 00:00:00 2001
+From: Bruce Ashfield <bruce.ashfield@windriver.com>
+Date: Wed, 9 Jan 2013 16:24:39 -0500
+Subject: [PATCH] scripts/Makefile.headersinst: install headers from scratch file
+
+If headers_install is executed from a deep/long directory structure, the
+shell's maximum argument length can be execeeded, which breaks the operation
+with:
+
+| make[2]: execvp: /bin/sh: Argument list too long
+| make[2]: ***
+
+By dumping the input files to a scratch file and using xargs to read the
+input list from the scratch file, we can avoid blowing out the maximum
+argument size and install headers in a long path name environment.
+
+Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
+---
+ scripts/Makefile.headersinst |    4 +++-
+ 1 files changed, 3 insertions(+), 1 deletions(-)
+
+diff --git a/scripts/Makefile.headersinst b/scripts/Makefile.headersinst
+index 06ba4a7..536d722 100644
+--- a/scripts/Makefile.headersinst
++++ b/scripts/Makefile.headersinst
+@@ -71,7 +71,7 @@ printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
+ quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
+                             file$(if $(word 2, $(all-files)),s))
+       cmd_install = \
+-        $(PERL) $< $(installdir) $(SRCARCH) $(input-files); \
++        xargs $(PERL) $< $(installdir) $(SRCARCH) < $(INSTALL_HDR_PATH)/.input-files; \
+         for F in $(wrapper-files); do                                   \
+                 echo "\#include <asm-generic/$$F>" > $(installdir)/$$F;    \
+         done;                                                           \
+@@ -100,7 +100,9 @@ targets += $(install-file)
+ $(install-file): scripts/headers_install.pl $(input-files) FORCE
+        $(if $(unwanted),$(call cmd,remove),)
+        $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
++       @echo $(input-files) > $(INSTALL_HDR_PATH)/.input-files
+        $(call if_changed,install)
++       @rm $(INSTALL_HDR_PATH)/.input-files
+ 
+ else
+ __headerscheck: $(subdirs) $(check-file)
+-- 
+1.7.0.4
+
diff --git a/meta/recipes-kernel/linux-libc-headers/linux-libc-headers_3.7.bb b/meta/recipes-kernel/linux-libc-headers/linux-libc-headers_3.7.bb
index 3d688b76eb..a363289988 100644
--- a/meta/recipes-kernel/linux-libc-headers/linux-libc-headers_3.7.bb
+++ b/meta/recipes-kernel/linux-libc-headers/linux-libc-headers_3.7.bb
@@ -1,4 +1,8 @@
 require linux-libc-headers.inc
 
+SRC_URI += "file://scripts-Makefile.headersinst-install-headers-from-sc.patch"
+
+PR = "r1"
+
 SRC_URI[md5sum] = "5323f3faadd051e83af605a63be5ea2e"
 SRC_URI[sha256sum] = "dc08d87a579fe2918362e6666e503a95a76296419195cb499aa9dd4dbe171a9e"