tsan: allow to cross-build Go runtime

Allow user to provide target GOOS/GOARCH.
If not provided, use the host GOOS/GOARCH as we do now.
This allows to cross-compile the runtime.
Also provide SKIP_TEST knob for cross-compilation
since the test will most likely not run on host.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D150650

Author: dvyukov

compiler-rt/lib/tsan/go/buildgo.sh

@@ -2,6 +2,45 @@
 
 set -e
 
+if [ "`uname -a | grep Linux`" != "" ]; then
+	HOST_GOOS="linux"
+	if [ "`uname -a | grep ppc64le`" != "" ]; then
+		HOST_GOARCH="ppc64le"
+	elif [ "`uname -a | grep x86_64`" != "" ]; then
+		HOST_GOARCH="amd64"
+	elif [ "`uname -a | grep aarch64`" != "" ]; then
+		HOST_GOARCH="arm64"
+	elif [ "`uname -a | grep -i mips64`" != "" ]; then
+		if [ "`lscpu | grep -i Little`" != "" ]; then
+			HOST_GOARCH="mips64le"
+		else
+			HOST_GOARCH="mips64"
+		fi
+	elif [ "`uname -a | grep s390x`" != "" ]; then
+		HOST_GOARCH="s390x"
+	fi
+elif [ "`uname -a | grep FreeBSD`" != "" ]; then
+	HOST_GOOS="freebsd"
+	HOST_GOARCH="amd64"
+elif [ "`uname -a | grep NetBSD`" != "" ]; then
+	HOST_GOOS="netbsd"
+	HOST_GOARCH="amd64"
+elif [ "`uname -a | grep Darwin`" != "" ]; then
+	HOST_GOOS="darwin"
+	if [ "`uname -a | grep x86_64`" != "" ]; then
+		HOST_GOARCH="amd64"
+	elif [ "`uname -a | grep arm64`" != "" ]; then
+		HOST_GOARCH="arm64"
+	fi
+elif [ "`uname -a | grep MINGW`" != "" ]; then
+	HOST_GOOS="windows"
+	HOST_GOARCH="amd64"
+fi
+
+GOOS=${GOOS:-$HOST_GOOS}
+GOARCH=${GOARCH:-$HOST_GOARCH}
+SUFFIX="${GOOS}_${GOARCH}"
+
 SRCS="
 	tsan_go.cpp
 	../rtl/tsan_external.cpp
@@ -39,7 +78,7 @@ SRCS="
 	../../sanitizer_common/sanitizer_termination.cpp
 "
 
-if [ "`uname -a | grep Linux`" != "" ]; then
+if [ "$GOOS" == "linux" ]; then
 	OSCFLAGS="-fPIC -Wno-maybe-uninitialized"
 	OSLDFLAGS="-lpthread -fPIC -fpie"
 	SRCS="
@@ -54,39 +93,30 @@ if [ "`uname -a | grep Linux`" != "" ]; then
 		../../sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
 		../../sanitizer_common/sanitizer_stoptheworld_netbsd_libcdep.cpp
 		"
-	if [ "`uname -a | grep ppc64le`" != "" ]; then
-		SUFFIX="linux_ppc64le"
+	if [ "$GOARCH" == "ppc64le" ]; then
 		ARCHCFLAGS="-m64 -mcpu=power8 -fno-function-sections"
-	elif [ "`uname -a | grep x86_64`" != "" ]; then
-		SUFFIX="linux_amd64"
+	elif [ "$GOARCH" == "amd64" ]; then
 		if [ "$GOAMD64" = "v3" ]; then
 			ARCHCFLAGS="-m64 -msse4.2"
 		else
 			ARCHCFLAGS="-m64 -msse3"
 		fi
 		OSCFLAGS="$OSCFLAGS -ffreestanding -Wno-unused-const-variable -Wno-unknown-warning-option"
-	elif [ "`uname -a | grep aarch64`" != "" ]; then
-		SUFFIX="linux_arm64"
+	elif [ "$GOARCH" == "arm64" ]; then
 		ARCHCFLAGS=""
-	elif [ "`uname -a | grep -i mips64`" != "" ]; then
-		if [ "`lscpu | grep -i Little`" != "" ]; then
-			SUFFIX="linux_mips64le"
-			ARCHCFLAGS="-mips64 -EL"
-		else
-			SUFFIX="linux_mips64"
-			ARCHCFLAGS="-mips64 -EB"
-		fi
-	elif [ "`uname -a | grep s390x`" != "" ]; then
+	elif [ "$GOARCH" == "mips64le" ]; then
+		ARCHCFLAGS="-mips64 -EL"
+	elif [ "$GOARCH" == "mips64" ]; then
+		ARCHCFLAGS="-mips64 -EB"
+	elif [ "$GOARCH" == "s390x" ]; then
 		SRCS="$SRCS ../../sanitizer_common/sanitizer_linux_s390.cpp"
-		SUFFIX="linux_s390x"
 		ARCHCFLAGS=""
 	fi
-elif [ "`uname -a | grep FreeBSD`" != "" ]; then
+elif [ "$GOOS" == "freebsd" ]; then
 	# The resulting object still depends on libc.
 	# We removed this dependency for Go runtime for other OSes,
 	# and we should remove it for FreeBSD as well, but there is no pressing need.
 	DEPENDS_ON_LIBC=1
-	SUFFIX="freebsd_amd64"
 	OSCFLAGS="-fno-strict-aliasing -fPIC -Werror"
 	ARCHCFLAGS="-m64"
 	OSLDFLAGS="-lpthread -fPIC -fpie"
@@ -102,12 +132,11 @@ elif [ "`uname -a | grep FreeBSD`" != "" ]; then
 		../../sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
 		../../sanitizer_common/sanitizer_stoptheworld_netbsd_libcdep.cpp
 	"
-elif [ "`uname -a | grep NetBSD`" != "" ]; then
+elif [ "$GOOS" == "netbsd" ]; then
 	# The resulting object still depends on libc.
 	# We removed this dependency for Go runtime for other OSes,
 	# and we should remove it for NetBSD as well, but there is no pressing need.
 	DEPENDS_ON_LIBC=1
-	SUFFIX="netbsd_amd64"
 	OSCFLAGS="-fno-strict-aliasing -fPIC -Werror"
 	ARCHCFLAGS="-m64"
 	OSLDFLAGS="-lpthread -fPIC -fpie"
@@ -124,7 +153,7 @@ elif [ "`uname -a | grep NetBSD`" != "" ]; then
 		../../sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cpp
 		../../sanitizer_common/sanitizer_stoptheworld_netbsd_libcdep.cpp
 	"
-elif [ "`uname -a | grep Darwin`" != "" ]; then
+elif [ "$GOOS" == "darwin" ]; then
 	OSCFLAGS="-fPIC -Wno-unused-const-variable -Wno-unknown-warning-option -mmacosx-version-min=10.7"
 	OSLDFLAGS="-lpthread -fPIC -fpie -mmacosx-version-min=10.7"
 	SRCS="
@@ -136,15 +165,12 @@ elif [ "`uname -a | grep Darwin`" != "" ]; then
 		../../sanitizer_common/sanitizer_posix_libcdep.cpp
 		../../sanitizer_common/sanitizer_procmaps_mac.cpp
 	"
-	if [ "`uname -a | grep x86_64`" != "" ]; then
-		SUFFIX="darwin_amd64"
+	if [ "$GOARCH" == "amd64" ]; then
 		ARCHCFLAGS="-m64"
-	elif [ "`uname -a | grep arm64`" != "" ]; then
-		SUFFIX="darwin_arm64"
+	elif [ "$GOARCH" == "arm64" ]; then
 		ARCHCFLAGS=""
 	fi
-elif [ "`uname -a | grep MINGW`" != "" ]; then
-	SUFFIX="windows_amd64"
+elif [ "$GOOS" == "windows" ]; then
 	OSCFLAGS="-Wno-error=attributes -Wno-attributes -Wno-unused-const-variable -Wno-unknown-warning-option"
 	ARCHCFLAGS="-m64"
 	OSLDFLAGS=""
@@ -204,6 +230,10 @@ if [ "$DEPENDS_ON_LIBC" != "1" ]; then
 	fi
 fi
 
+if [ "$SKIP_TEST" == "1" ]; then
+	exit 0
+fi
+
 if [ "`uname -a | grep NetBSD`" != "" ]; then
   # Turn off ASLR in the test binary.
   /usr/sbin/paxctl +a $DIR/test