[SYCLomatic][--gen-build-script] Fix the bug that the TARGET path is incorrect in the generated Makefile if TARGET has an absolute path

clang/lib/DPCT/MigrateScript/GenMakefile.cpp

@@ -162,6 +162,13 @@ static void getCompileInfo(
         continue;
       }
 
+      SmallString<512> TargetNameStr(TargetName);
+      if (path::is_absolute(TargetNameStr)) {
+        llvm::sys::path::replace_path_prefix(TargetNameStr,
+                                             InRoot.getCanonicalPath(), ".");
+      }
+      TargetName = TargetNameStr.c_str();
+
       clang::tooling::UnifiedPath OutDirectory =
           dpct::appendPath(Directory, TargetName);
       // Use relative path to out-root directory.

clang/test/dpct/gen_build_script2/Makefile

@@ -0,0 +1,17 @@
+CC = nvcc
+TARGET = hello
+WORK_DIR = $(shell pwd)
+
+all: $(TARGET)
+
+$(TARGET).o:$(TARGET).cu
+	$(CC) -c -o $(TARGET).o $(TARGET).cu
+
+$(TARGET): $(TARGET).o
+	$(CC) -o $(WORK_DIR)/$(TARGET) $(TARGET).o
+
+clean:
+	rm -f $(TARGET) $(TARGET).o
+
+
+

clang/test/dpct/gen_build_script2/Makefile.dpct.ref

@@ -0,0 +1,16 @@
+// CHECK: INCLUDE_SYCL := $(ROOT_DIR)/../include
+// CHECK: INCLUDE_CL   := $(ROOT_DIR)/../include/sycl
+// CHECK: TARGET_0_SRC_0 = ./hello.dp.cpp
+// CHECK: TARGET_0_OBJ_0 = ./hello.dp.o
+// CHECK: TARGET_0_FLAG_0 = ${FLAGS}
+// CHECK: TARGET_0 := ./hello
+// CHECK: TARGET :=  ${TARGET_0}
+// CHECK: .PHONY:all clean
+// CHECK: OBJS_0 :=  ${TARGET_0_OBJ_0}
+// CHECK: all: $(TARGET)
+// CHECK: $(TARGET_0): $(OBJS_0)
+// CHECK:         $(CC) -fsycl -o $@ $^ $(LIB)
+// CHECK: $(TARGET_0_OBJ_0):$(TARGET_0_SRC_0)
+// CHECK:         $(CC) -fsycl -c ${TARGET_0_SRC_0} -o ${TARGET_0_OBJ_0} $(TARGET_0_FLAG_0)
+// CHECK: clean:
+// CHECK:         rm -f  ${OBJS_0} $(TARGET)

clang/test/dpct/gen_build_script2/hello.cu

@@ -0,0 +1,20 @@
+// UNSUPPORTED: system-windows
+// RUN: cat %s > %T/hello.cu
+// RUN: cat %S/Makefile > %T/Makefile
+// RUN: cd %T/
+// RUN: intercept-build /usr/bin/make -B
+// RUN: dpct -in-root ./ -out-root out -p ./ -gen-build-script --cuda-include-path="%cuda-path/include"
+// RUN: cat %S/Makefile.dpct.ref  >%T/Makefile.dpct.check
+// RUN: cat %T/out/Makefile.dpct >> %T/Makefile.dpct.check
+// RUN: FileCheck --match-full-lines --input-file %T/Makefile.dpct.check %T/Makefile.dpct.check
+// RUN: %if build_lit %{cd out && make -f Makefile.dpct %}
+
+// CHECK: void hello() {}
+__global__ void hello() {}
+
+int main() {
+    hello<<<1, 1>>>();
+    cudaDeviceSynchronize();
+
+    return 0;
+}