libx11: squash whitespace in generated files

The locale data in the recipe is generated using cpp, which results in
differing amounts of whitespace depending on what compiler is used.
This means that the files may differ in just whitespace, which is
sufficient for RPM's multilib code to consider them different and not
allow lib32-libx11-locale and lib64-libx11-locale to be installed at the
same time.

[ YOCTO #13647 ]

Signed-off-by: Ross Burton <ross.burton@intel.com>

3 files changed, 60 insertions, 2 deletions

diff --git a/meta/recipes-graphics/xorg-lib/files/libx11-whitespace.patch b/meta/recipes-graphics/xorg-lib/files/libx11-whitespace.patch
new file mode 100644
index 0000000000..3f97143082
--- /dev/null
+++ b/meta/recipes-graphics/xorg-lib/files/libx11-whitespace.patch
@@ -0,0 +1,56 @@
+Upstream-Status: Submitted [https://gitlab.freedesktop.org/xorg/lib/libx11/merge_requests/33]
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+From b41469c5f08b1f3365667ff3c430b104c9b8e25f Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@intel.com>
+Date: Wed, 22 Jan 2020 17:11:23 +0000
+Subject: [PATCH libX11] cpprules.in: squash whitespace in generated files
+
+CPP is used to generate files, but as cpp reads files from the build host the
+output has a number of blank lines at the beginning which varies depending on
+what GCC and friends is used.
+
+Pathalogical example:
+
+ $ cpp -undef -traditional /dev/null
+ # 1 "/dev/null"
+ # 1 "<built-in>"
+ # 1 "<command-line>"
+ # 31 "<command-line>"
+ # 1 "/usr/include/stdc-predef.h" 1 3 4
+
+ # 17 "/usr/include/stdc-predef.h" 3 4
+
+ [ 40 blank line ]
+
+ # 32 "<command-line>" 2
+ # 1 "/dev/null"
+
+So depending on the content of stdc-predef.h and what other headers CPP will
+load, the amount of whitespace in the generates files varies. This can result in
+differences in reproducible environments, and file conflicts in multilib
+environments.
+
+As whitespace is irrelevant to these machine-readable files, extend the sed to
+just delete blank lines.
+---
+ cpprules.in | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git a/cpprules.in b/cpprules.in
+index 03d6701e..ce6b3c98 100644
+--- a/cpprules.in
++++ b/cpprules.in
+@@ -23,7 +23,8 @@ CPP_SED_MAGIC = $(SED) -e '/^\#  *[0-9][0-9]*  *.*$$/d' \
+                        -e '/^[	 ]*XCOMM[^a-zA-Z0-9_]/s/XCOMM/\#/' \
+                        -e '/^[	 ]*XHASH/s/XHASH/\#/' \
+                        -e 's,X11_LOCALEDATADIR,$(X11_LOCALEDATADIR),g' \
+-                       -e '/\@\@$$/s/\@\@$$/\\/'
++                       -e '/\@\@$$/s/\@\@$$/\\/' \
++                       -e '/^$$/d'
+ 
+ .pre:
+ 	@$(MKDIR_P) $(@D)
+-- 
+2.20.1
+
diff --git a/meta/recipes-graphics/xorg-lib/libx11-compose-data_1.6.8.bb b/meta/recipes-graphics/xorg-lib/libx11-compose-data_1.6.8.bb
index cabb84e686..3d97ad78d2 100644
--- a/meta/recipes-graphics/xorg-lib/libx11-compose-data_1.6.8.bb
+++ b/meta/recipes-graphics/xorg-lib/libx11-compose-data_1.6.8.bb
@@ -14,7 +14,8 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=172255dee66bb0151435b2d5d709fcf7"
 SRC_URI[md5sum] = "c5fa5a86a20e3591bed6c046498d4b8f"
 SRC_URI[sha256sum] = "b289a845c189e251e0e884cc0f9269bbe97c238df3741e854ec4c17c21e473d5"
 
-SRC_URI += "file://0001-Drop-x11-dependencies.patch"
+SRC_URI += "file://0001-Drop-x11-dependencies.patch \
+            file://libx11-whitespace.patch"
 
 XORG_PN = "libX11"
 
diff --git a/meta/recipes-graphics/xorg-lib/libx11_1.6.9.bb b/meta/recipes-graphics/xorg-lib/libx11_1.6.9.bb
index 8c2a57c674..ff60a4240c 100644
--- a/meta/recipes-graphics/xorg-lib/libx11_1.6.9.bb
+++ b/meta/recipes-graphics/xorg-lib/libx11_1.6.9.bb
@@ -11,7 +11,8 @@ FILESEXTRAPATHS =. "${FILE_DIRNAME}/libx11:"
 PE = "1"
 
 SRC_URI += "file://Fix-hanging-issue-in-_XReply.patch \
-            file://disable_tests.patch"
+            file://disable_tests.patch \
+            file://libx11-whitespace.patch"
 
 SRC_URI[md5sum] = "55adbfb6d4370ecac5e70598c4e7eed2"
 SRC_URI[sha256sum] = "9cc7e8d000d6193fa5af580d50d689380b8287052270f5bb26a5fb6b58b2bed1"