[OE-core] [PATCH 1/2] nss: Fix build with clang

[Khem Raj]

Add a patch to disable a clang specific warning
and avoid passing clang options to gcc when we have
cross compiler is clang but host compiler is gcc
We do not need to use target cflags when building
native pieces and hence avoid the inter-mixing of
compiler options

Signed-off-by: Khem Raj <raj.khem at gmail.com>
---
 .../nss/nss/disable-Wvarargs-with-clang.patch      | 33 ++++++++++++++++++++++
 .../nss/nss/nss-fix-nsinstall-build.patch          | 11 ++++----
 meta/recipes-support/nss/nss_3.24.bb               |  2 ++
 3 files changed, 41 insertions(+), 5 deletions(-)
 create mode 100644 meta/recipes-support/nss/nss/disable-Wvarargs-with-clang.patch

diff --git a/meta/recipes-support/nss/nss/disable-Wvarargs-with-clang.patch b/meta/recipes-support/nss/nss/disable-Wvarargs-with-clang.patch
new file mode 100644
index 0000000..86b1b60
--- /dev/null
+++ b/meta/recipes-support/nss/nss/disable-Wvarargs-with-clang.patch
@@ -0,0 +1,33 @@
+clang 3.9 add this warning to rightly flag undefined
+behavior, we relegate this to be just a warning instead
+of error and keep the behavior as it was. Right fix would
+be to not pass enum to the function with variadic arguments
+as last named argument
+
+Fixes errors like
+ocsp.c:2220:22: error: passing an object that undergoes default argument promotion to 'va_start' has undefined behavior [-Werror,-Wvarargs]
+        va_start(ap, responseType0);
+                     ^
+ocsp.c:2200:43: note: parameter of type 'SECOidTag' is declared here
+                                SECOidTag responseType0, ...)
+
+see
+https://www.securecoding.cert.org/confluence/display/cplusplus/EXP58-CPP.+Pass+an+object+of+the+correct+type+to+va_start
+for more details
+
+Signed-off-by: Khem Raj <raj.khem at gmail.com>
+Upstream-Status: Pending
+
+Index: nss-3.24/nss/coreconf/Werror.mk
+===================================================================
+--- nss-3.24.orig/nss/coreconf/Werror.mk
++++ nss-3.24/nss/coreconf/Werror.mk
+@@ -54,7 +54,7 @@ ifndef WARNING_CFLAGS
+     ifdef CC_IS_CLANG
+       # -Qunused-arguments : clang objects to arguments that it doesn't understand
+       #    and fixing this would require rearchitecture
+-      WARNING_CFLAGS += -Qunused-arguments
++      WARNING_CFLAGS += -Qunused-arguments -Wno-error=varargs
+       # -Wno-parentheses-equality : because clang warns about macro expansions
+       WARNING_CFLAGS += $(call disable_warning,parentheses-equality)
+       ifdef BUILD_OPT
diff --git a/meta/recipes-support/nss/nss/nss-fix-nsinstall-build.patch b/meta/recipes-support/nss/nss/nss-fix-nsinstall-build.patch
index 866de07..181c69a 100644
--- a/meta/recipes-support/nss/nss/nss-fix-nsinstall-build.patch
+++ b/meta/recipes-support/nss/nss/nss-fix-nsinstall-build.patch
@@ -16,11 +16,11 @@ Upstream-Status: Pending
 
 Signed-off-by: Wenzong Fan <wenzong.fan at windriver.com>
 ===================================================
-diff --git a/nss/coreconf/nsinstall/Makefile b/nss/coreconf/nsinstall/Makefile
-index 1850bcb..5aee84f 100644
---- a/nss/coreconf/nsinstall/Makefile
-+++ b/nss/coreconf/nsinstall/Makefile
-@@ -18,6 +18,12 @@ INTERNAL_TOOLS  = 1
+Index: nss-3.24/nss/coreconf/nsinstall/Makefile
+===================================================================
+--- nss-3.24.orig/nss/coreconf/nsinstall/Makefile
++++ nss-3.24/nss/coreconf/nsinstall/Makefile
+@@ -18,6 +18,13 @@ INTERNAL_TOOLS  = 1
  
  include $(DEPTH)/coreconf/config.mk
  
@@ -29,6 +29,7 @@ index 1850bcb..5aee84f 100644
 +# to clean the '-m64' from ARCHFLAG and LDFLAGS.
 +ARCHFLAG =
 +LDFLAGS =
++CFLAGS =
 +
  ifeq (,$(filter-out OS2 WIN%,$(OS_TARGET)))
  PROGRAM		=
diff --git a/meta/recipes-support/nss/nss_3.24.bb b/meta/recipes-support/nss/nss_3.24.bb
index 95a33f2..caed7fa 100644
--- a/meta/recipes-support/nss/nss_3.24.bb
+++ b/meta/recipes-support/nss/nss_3.24.bb
@@ -20,6 +20,7 @@ SRC_URI = "\
     file://nss-no-rpath-for-cross-compiling.patch \
     file://nss-fix-incorrect-shebang-of-perl.patch \
     file://nss-fix-nsinstall-build.patch \
+    file://disable-Wvarargs-with-clang.patch \
     file://nss.pc.in \
     file://signlibs.sh \
 "
@@ -62,6 +63,7 @@ do_compile_prepend_class-native() {
 do_compile() {
     export CROSS_COMPILE=1
     export NATIVE_CC="gcc"
+    export NATIVE_FLAGS="${HOST_CFLAGS}"
     export BUILD_OPT=1
 
     export FREEBL_NO_DEPEND=1
-- 
2.9.0