[build] Fix openblas build for aarch64 (#2806)

src/configure

@@ -1344,6 +1344,8 @@ elif [ "`uname`" == "Linux" ]; then
     echo >> kaldi.mk
     if [[ "$TARGET_ARCH" == arm* ]]; then
       cat makefiles/linux_openblas_arm.mk >> kaldi.mk
+    elif [[ "$TARGET_ARCH" == aarch64* ]]; then
+      cat makefiles/linux_openblas_aarch64.mk >> kaldi.mk
     elif [[ "$TARGET_ARCH" == ppc64le ]]; then
       cat makefiles/linux_openblas_ppc64le.mk >> kaldi.mk
     else

src/makefiles/linux_openblas_aarch64.mk

@@ -0,0 +1,39 @@
+# OpenBLAS specific Linux ARM configuration
+
+ifndef DOUBLE_PRECISION
+$(error DOUBLE_PRECISION not defined.)
+endif
+ifndef OPENFSTINC
+$(error OPENFSTINC not defined.)
+endif
+ifndef OPENFSTLIBS
+$(error OPENFSTLIBS not defined.)
+endif
+ifndef OPENBLASINC
+$(error OPENBLASINC not defined.)
+endif
+ifndef OPENBLASLIBS
+$(error OPENBLASLIBS not defined.)
+endif
+
+CXXFLAGS = -std=c++11 -I.. -isystem $(OPENFSTINC) -O1 $(EXTRA_CXXFLAGS) \
+           -Wall -Wno-sign-compare -Wno-unused-local-typedefs \
+           -Wno-deprecated-declarations -Winit-self \
+           -DKALDI_DOUBLEPRECISION=$(DOUBLE_PRECISION) \
+           -DHAVE_EXECINFO_H=1 -DHAVE_CXXABI_H -DHAVE_OPENBLAS -I$(OPENBLASINC) \
+           -ftree-vectorize -pthread \
+           -g # -O0 -DKALDI_PARANOID
+
+ifeq ($(KALDI_FLAVOR), dynamic)
+CXXFLAGS += -fPIC
+endif
+
+# Compiler specific flags
+COMPILER = $(shell $(CXX) -v 2>&1)
+ifeq ($(findstring clang,$(COMPILER)),clang)
+# Suppress annoying clang warnings that are perfectly valid per spec.
+CXXFLAGS += -Wno-mismatched-tags
+endif
+
+LDFLAGS = $(EXTRA_LDFLAGS) $(OPENFSTLDFLAGS) -rdynamic
+LDLIBS = $(EXTRA_LDLIBS) $(OPENFSTLIBS) $(OPENBLASLIBS) -lm -lpthread -ldl