Add support for RISC-V (riscv64)

Signed-off-by: David Abdurachmanov <david.abdurachmanov@gmail.com>

llvm.spec

@@ -28,6 +28,9 @@
 %ifarch %{arm}
 %global llvm_targets ARM;BPF
 %endif
+%ifarch riscv64
+%global llvm_targets RISCV;AMDGPU;BPF
+%endif
 
 %if 0%{?compat_build}
 %global pkg_name llvm%{maj_ver}.%{min_ver}
@@ -49,7 +52,7 @@
 
 Name:		%{pkg_name}
 Version:	%{maj_ver}.%{min_ver}.%{patch_ver}
-Release:	0.1.rc%{rc_ver}%{?dist}
+Release:	0.1.rc%{rc_ver}.0.riscv64%{?dist}
 Summary:	The Low Level Virtual Machine
 
 License:	NCSA
@@ -76,7 +79,9 @@ BuildRequires:  binutils-devel
 %endif
 BuildRequires:  libstdc++-static
 # Enable extra functionality when run the LLVM JIT under valgrind.
+%ifarch %{valgrind_arches}
 BuildRequires:  valgrind-devel
+%endif
 # LLVM's LineEditor library will use libedit if it is available.
 BuildRequires:  libedit-devel
 
@@ -125,20 +130,28 @@ Static libraries for the LLVM compiler infrastructure.
 %prep
 %autosetup -n llvm-%{version}%{?rc_ver:rc%{rc_ver}}.src -p1
 
+# Update config.guess to detect RISC-V (riscv64)
+cp -f /usr/lib/rpm/redhat/config.guess ./cmake/config.guess
+
 %build
 mkdir -p _build
 cd _build
 
-%ifarch s390 %{arm} %ix86
+%ifarch s390 %{arm} %ix86 riscv64
 # Decrease debuginfo verbosity to reduce memory consumption during final library linking
 %global optflags %(echo %{optflags} | sed 's/-g /-g1 /')
 %endif
 
+# Workaround for GCC issue
+%ifarch riscv64
+export LDFLAGS="${LDFLAGS} -latomic %{__global_ldflags}"
+%endif
+
 # force off shared libs as cmake macros turns it on.
 %cmake .. -G Ninja \
 	-DBUILD_SHARED_LIBS:BOOL=OFF \
 	-DCMAKE_BUILD_TYPE=RelWithDebInfo \
-%ifarch s390 %{arm} %ix86
+%ifarch s390 %{arm} %ix86 riscv64
 	-DCMAKE_C_FLAGS_RELWITHDEBINFO="%{optflags} -DNDEBUG" \
 	-DCMAKE_CXX_FLAGS_RELWITHDEBINFO="%{optflags} -DNDEBUG" \
 %endif
@@ -333,6 +346,9 @@ fi
 %endif
 
 %changelog
+* Sun Aug 12 2018 David Abdurachmanov <david.abdurachmanov@gmail.com> - 7.0.0-0.1.rc1.0.riscv64
+- Add support for RISC-V (riscv64)
+
 * Fri Aug 10 2018 Tom Stellard <tstellar@redhat.com> - 7.0.0-0.1.rc1
 - 7.0.0-rc1 Release
 - Reduce number of enabled targets on all arches.