[oe] [meta-systemd][PATCH V4 5/8] systemd: Use cross cpp

[Khem Raj]

While building for non x86 arch (ppc) found that build
was using host's cpp which was not generating exact
syscall list for ppc since it was using the include files
from host

With this patch will use $(CPP) instead of hardcoding
cpp in makefile.am and then set CPP properly in recipe

Fixes build failures on cross builds

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 .../systemd/systemd/use-cross-cpp.patch            |   30 ++++++++++++++++++++
 meta-systemd/recipes-core/systemd/systemd_git.bb   |    2 +
 2 files changed, 32 insertions(+), 0 deletions(-)
 create mode 100644 meta-systemd/recipes-core/systemd/systemd/use-cross-cpp.patch

diff --git a/meta-systemd/recipes-core/systemd/systemd/use-cross-cpp.patch b/meta-systemd/recipes-core/systemd/systemd/use-cross-cpp.patch
new file mode 100644
index 0000000..8a4371e
--- /dev/null
+++ b/meta-systemd/recipes-core/systemd/systemd/use-cross-cpp.patch
@@ -0,0 +1,30 @@
+hardcoding cpp does not work when cross compiling systemd.
+since it will use the include headers from host system and
+syscalls are different for different architectures.
+
+Signed-off-by: Khem Raj <raj.khem at gmail.com>
+
+Upstream-Status: Pending
+
+Index: systemd-187/Makefile.am
+===================================================================
+--- systemd-187.orig/Makefile.am	2012-07-29 16:39:57.628405921 -0700
++++ systemd-187/Makefile.am	2012-07-29 16:40:37.248405921 -0700
+@@ -1026,7 +1026,7 @@
+ 	src/core/syscall-to-name.h
+ 
+ src/core/syscall-list.txt: Makefile
+-	$(AM_V_GEN)cpp $(AM_CPPFLAGS) $(CPPFLAGS) -dM -include sys/syscall.h < /dev/null | $(AWK) '/^#define[ \t]+__NR_[^ ]+[ \t]+[0-9]/ { sub(/__NR_/, "", $$2); print $$2; }' > $@
++	$(AM_V_GEN)$(CPP) $(AM_CPPFLAGS) $(CPPFLAGS) -dM -include sys/syscall.h < /dev/null | $(AWK) '/^#define[ \t]+__NR_[^ ]+[ \t]+[0-9]/ { sub(/__NR_/, "", $$2); print $$2; }' > $@
+ 
+ src/core/syscall-from-name.gperf: src/core/syscall-list.txt Makefile
+ 	$(AM_V_GEN)$(AWK) 'BEGIN{ print "struct syscall_name { const char* name; int id; };"; print "%null-strings"; print "%%";} { printf "%s, __NR_%s\n", $$1, $$1 }' < $< > $@
+@@ -2199,7 +2199,7 @@
+ 
+ src/udev/keymap/keys.txt: Makefile
+ 	$(AM_V_at)mkdir -p src/udev/keymap
+-	$(AM_V_GEN)cpp $(AM_CPPFLAGS) $(CPPFLAGS) -dM -include linux/input.h < /dev/null | $(AWK) '/^#define[ \t]+KEY_[^ ]+[ \t]+[0-9]/ { if ($$2 != "KEY_MAX") { print $$2 } }' | sed 's/^KEY_COFFEE$$/KEY_SCREENLOCK/' > $@
++	$(AM_V_GEN)$(CPP) $(AM_CPPFLAGS) $(CPPFLAGS) -dM -include linux/input.h < /dev/null | $(AWK) '/^#define[ \t]+KEY_[^ ]+[ \t]+[0-9]/ { if ($$2 != "KEY_MAX") { print $$2 } }' | sed 's/^KEY_COFFEE$$/KEY_SCREENLOCK/' > $@
+ 
+ src/udev/keymap/keys-from-name.gperf: src/udev/keymap/keys.txt Makefile
+ 	$(AM_V_GEN)$(AWK) 'BEGIN{ print "struct key { const char* name; unsigned short id; };"; print "%null-strings"; print "%%";} { print $$1 ", " $$1 }' < $< > $@
diff --git a/meta-systemd/recipes-core/systemd/systemd_git.bb b/meta-systemd/recipes-core/systemd/systemd_git.bb
index 5d1c28b..b1cc9c3 100644
--- a/meta-systemd/recipes-core/systemd/systemd_git.bb
+++ b/meta-systemd/recipes-core/systemd/systemd_git.bb
@@ -27,6 +27,7 @@ SRCREV = "3fd89536883ea9e24e69f28de0d11cd7cffb42ce"
 
 SRC_URI = "git://anongit.freedesktop.org/systemd/systemd;protocol=git \
            file://use-rootlibdir.patch \
+           file://use-cross-cpp.patch \
            file://gtk-doc.make \
            file://touchscreen.rules \
            file://modprobe.rules \
@@ -62,6 +63,7 @@ EXTRA_OECONF = " --with-distro=${SYSTEMDDISTRO} \
 
 # There's no docbook-xsl-native, so for the xsltproc check to false
 do_configure_prepend() {
+	export CPP="${HOST_PREFIX}cpp ${TOOLCHAIN_OPTIONS} ${HOST_CC_ARCH}"
 	sed -i /xsltproc/d configure.ac
 
 	cp ${WORKDIR}/gtk-doc.make ${S}/docs/
-- 
1.7.5.4