Build clang libraries by default with -fno-exceptions and with

-fno-rtti. The clang libaries that really use exceptions and virtual
functions can enable LLVM_REQUIRES_EH and LLVM_REQUIRES_RTTI
respectively. This saves space on the resulting binaries and follows
what's being done upstream.

Submitted by:	Dimitry Andric <dimitry at andric.com>

4 files changed, 14 insertions, 0 deletions

diff --git a/lib/clang/clang.build.mk b/lib/clang/clang.build.mk
index fad4317..6351eda 100644
--- a/lib/clang/clang.build.mk
+++ b/lib/clang/clang.build.mk
@@ -17,6 +17,17 @@ TARGET_ARCH?=	${MACHINE_ARCH}
 # XXX: 8.0, to keep __FreeBSD_cc_version happy
 CFLAGS+=-DLLVM_HOSTTRIPLE=\"${TARGET_ARCH}-undermydesk-freebsd9.0\"
 
+.ifndef LLVM_REQUIRES_EH
+CFLAGS+=-fno-exceptions
+.else
+# If the library or program requires EH, it also requires RTTI.
+LLVM_REQUIRES_RTTI=
+.endif
+
+.ifndef LLVM_REQUIRES_RTTI
+CFLAGS+=-fno-rtti
+.endif
+
 .PATH:	${LLVM_SRCS}/${SRCDIR}
 
 TBLGEN=tblgen ${CFLAGS:M-I*}
diff --git a/lib/clang/libllvmcore/Makefile b/lib/clang/libllvmcore/Makefile
index 1215f4e..4fa5471 100644
--- a/lib/clang/libllvmcore/Makefile
+++ b/lib/clang/libllvmcore/Makefile
@@ -35,6 +35,7 @@ SRCS=	AsmWriter.cpp \
 	ValueSymbolTable.cpp \
 	ValueTypes.cpp \
 	Verifier.cpp
+LLVM_REQUIRES_RTTI=
 
 TGHDRS=	Intrinsics
 
diff --git a/lib/clang/libllvmsupport/Makefile b/lib/clang/libllvmsupport/Makefile
index 3a96db2..1ed069e 100644
--- a/lib/clang/libllvmsupport/Makefile
+++ b/lib/clang/libllvmsupport/Makefile
@@ -48,5 +48,6 @@ SRCS=	APFloat.cpp \
 	regexec.c \
 	regfree.c \
 	regstrlcpy.c
+LLVM_REQUIRES_RTTI=
 
 .include "../clang.lib.mk"
diff --git a/lib/clang/libllvmsystem/Makefile b/lib/clang/libllvmsystem/Makefile
index ae8cdc9..0c08ec2 100644
--- a/lib/clang/libllvmsystem/Makefile
+++ b/lib/clang/libllvmsystem/Makefile
@@ -22,5 +22,6 @@ SRCS=	Alarm.cpp \
 	Threading.cpp \
 	TimeValue.cpp \
 	Valgrind.cpp
+LLVM_REQUIRES_RTTI=
 
 .include "../clang.lib.mk"