Define several extra macros in bsd.sys.mk and sys/conf/kern.pre.mk, to

get rid of testing explicitly for clang (using ${CC:T:Mclang}) in
individual Makefiles.

Instead, use the following extra macros, for use with clang:
- NO_WERROR.clang       (disables -Werror)
- NO_WCAST_ALIGN.clang  (disables -Wcast-align)
- NO_WFORMAT.clang	(disables -Wformat and friends)
- CLANG_NO_IAS		(disables integrated assembler)
- CLANG_OPT_SMALL	(adds flags for extra small size optimizations)

As a side effect, this enables setting CC/CXX/CPP in src.conf instead of
make.conf!  For clang, use the following:

CC=clang
CXX=clang++
CPP=clang-cpp

MFC after:	2 weeks

1 files changed, 1 insertions, 3 deletions

diff --git a/lib/libthread_db/Makefile b/lib/libthread_db/Makefile
index a66f25da6f63..b612f4f8d789 100644
--- a/lib/libthread_db/Makefile
+++ b/lib/libthread_db/Makefile
@@ -16,10 +16,8 @@ SYM_MAPS+=${.CURDIR}/Symbol.map
 SYMBOL_MAPS=${SYM_MAPS}
 VERSION_DEF=${.CURDIR}/../libc/Versions.def
 
-.if ${CC:T:Mclang} == "clang"
 # Unfortunately, clang gives an incorrect warning about alignment in
 # arch/i386/libpthread_md.c, so turn that off for now.
-NO_WCAST_ALIGN=
-.endif
+NO_WCAST_ALIGN.clang=
 
 .include <bsd.lib.mk>