Parts of compiler-rt are also built for libgcc_eh and libgcc_s, and
these were already pointing to the libunwind unwind.h. For the sake of
consistency, also build compiler-rt itself against the libunwind
unwind.h, not the libcxxrt one.
Approved by: re (gjb)
MFC after: 3 days
(cherry picked from commit
7ecd99fa424df001028c5cddc52d25b29232f1af)
(cherry picked from commit
4c622a8f051d8dd9fab0719b00a6eccdbd13ac62)
CFLAGS+= ${PICFLAG}
CFLAGS+= -fvisibility=hidden
CFLAGS+= -DVISIBILITY_HIDDEN
-CFLAGS+= -I${SRCTOP}/contrib/libcxxrt
+CFLAGS+= -I${SRCTOP}/contrib/llvm-project/libunwind/include
# gcc has incompatible internal declarations for __divtc3 and __multc3, but has
# no option to silence its warning, so make warnings non-fatal.