[SYCL] Enable devicelib when using -fsycl-link to generate partially … (#2625)

Signed-off-by: gejin <[email protected]>

Author: jinge90

clang/lib/Driver/Driver.cpp

@@ -3743,6 +3743,16 @@ class OffloadingActionBuilder final {
           for (auto SDA : SYCLDeviceActions)
             SYCLLinkBinaryList.push_back(SDA);
           if (WrapDeviceOnlyBinary) {
+            // If used without -fintelfpga, -fsycl-link is used to wrap device
+            // objects for future host link. Device libraries should be linked
+            // by default to resolve any undefined reference.
+            if (!Args.hasArg(options::OPT_fintelfpga)) {
+              const auto *TC = ToolChains.front();
+              addSYCLDeviceLibs(TC, SYCLLinkBinaryList, true,
+                                C.getDefaultToolChain()
+                                    .getTriple()
+                                    .isWindowsMSVCEnvironment());
+            }
             // -fsycl-link behavior does the following to the unbundled device
             // binaries:
             //   1) Link them together using llvm-link

clang/test/Driver/sycl-offload.c

@@ -416,9 +416,9 @@
 
 /// Check -fsycl-link behaviors unbundle
 // RUN:   touch %t.o
-// RUN:   %clang -### -ccc-print-phases -target x86_64-unknown-linux-gnu -fsycl -o %t.out -fsycl-link %t.o 2>&1 \
+// RUN:   %clang -### -ccc-print-phases -target x86_64-unknown-linux-gnu -fsycl -o %t.out -fsycl-link -fno-sycl-device-lib=all %t.o 2>&1 \
 // RUN:   | FileCheck -check-prefix=CHK-LINK-UB %s
-// RUN:   %clang_cl -### -ccc-print-phases -fsycl -o %t.out -fsycl-link %t.o 2>&1 \
+// RUN:   %clang_cl -### -ccc-print-phases -fsycl -o %t.out -fsycl-link -fno-sycl-device-lib=all %t.o 2>&1 \
 // RUN:   | FileCheck -check-prefix=CHK-LINK-UB %s
 // CHK-LINK-UB: 0: input, "[[INPUT:.+\.o]]", object
 // CHK-LINK-UB: 1: clang-offload-unbundler, {0}, object
@@ -431,9 +431,9 @@
 /// ###########################################################################
 
 /// Check -fsycl-link behaviors from source
-// RUN:   %clang -### -ccc-print-phases -target x86_64-unknown-linux-gnu -fsycl -o %t.out -fsycl-link %s 2>&1 \
+// RUN:   %clang -### -ccc-print-phases -target x86_64-unknown-linux-gnu -fsycl -o %t.out -fsycl-link -fno-sycl-device-lib=all %s 2>&1 \
 // RUN:   | FileCheck -check-prefix=CHK-LINK %s
-// RUN:   %clang_cl -### -ccc-print-phases -fsycl -o %t.out -fsycl-link %s 2>&1 \
+// RUN:   %clang_cl -### -ccc-print-phases -fsycl -o %t.out -fsycl-link -fno-sycl-device-lib=all %s 2>&1 \
 // RUN:   | FileCheck -check-prefix=CHK-LINK %s
 // CHK-LINK: 0: input, "[[INPUT:.+\.c]]", c++, (device-sycl)
 // CHK-LINK: 1: preprocessor, {0}, c++-cpp-output, (device-sycl)

sycl/test/devicelib/separate_compile_test.cpp

@@ -0,0 +1,15 @@
+// RUN: %clangxx -fsycl -fsycl-link %S/std_complex_math_test.cpp -o %t_device.o
+// RUN: %clangxx -fsycl-device-only -Xclang -fsycl-int-header=std_complex_math_test_ihdr.h %S/std_complex_math_test.cpp -I %sycl_include -Wno-sycl-strict
+// >> host compilation...
+// RUN: %clangxx -include std_complex_math_test_ihdr.h -c %S/std_complex_math_test.cpp -o %t_host.o -I %sycl_include -Wno-sycl-strict
+// RUN: %clangxx %t_host.o %t_device.o -o %t.out -lsycl
+// RUN: %CPU_RUN_PLACEHOLDER %t.out
+// RUN: %ACC_RUN_PLACEHOLDER %t.out
+
+// RUN: %clangxx -fsycl -fsycl-link -fsycl-device-lib=all %S/std_complex_math_fp64_test.cpp -o %t_fp64_device.o
+// RUN: %clangxx -fsycl-device-only -Xclang -fsycl-int-header=std_complex_math_fp64_test_ihdr.h %S/std_complex_math_fp64_test.cpp -I %sycl_include -Wno-sycl-strict
+// >> host compilation...
+// RUN: %clangxx -include std_complex_math_fp64_test_ihdr.h -c %S/std_complex_math_fp64_test.cpp -o %t_fp64_host.o -I %sycl_include -Wno-sycl-strict
+// RUN: %clangxx %t_fp64_host.o %t_fp64_device.o -o %t_fp64.out -lsycl
+// RUN: %CPU_RUN_PLACEHOLDER %t_fp64.out
+// RUN: %ACC_RUN_PLACEHOLDER %t_fp64.out