Add devicelib linking test

Check if device lib flags get treated correctly for AMDGCN and
that the linking actions for the correct device libraries are generated.

Author: Martin Wehking

clang/test/Driver/sycl-device-lib-amdgcn.cpp

@@ -0,0 +1,45 @@
+// Tests specific to `-fsycl-targets=amdgcn-amd-amdhsa`
+// Verify that the correct devicelib linking actions are spawned by the driver.
+// Check also if the correct warnings are generated.
+
+// UNSUPPORTED: system-windows
+// REQUIRES: amdgpu-registered-target
+
+// Check if internal libraries are still linked against when linkage of all
+// device libs is manually excluded.
+// RUN: %clangxx -ccc-print-phases -std=c++11 -fsycl -fno-sycl-device-lib=all --sysroot=%S/Inputs/SYCL \
+// RUN: -fsycl-targets=amdgcn-amd-amdhsa -Xsycl-target-backend --offload-arch=gfx906 %s 2>&1 \
+// RUN: | FileCheck -check-prefix=CHK-NO-DEVLIB %s
+
+// CHK-NO-DEVLIB-NOT: {{[0-9]+}}: input, "{{.*}}devicelib--amd.bc", ir, (device-sycl, gfx906)
+// CHK-NO-DEVLIB: [[LIB1:[0-9]+]]: input, "{{.*}}libsycl-itt-user-wrappers.bc", ir, (device-sycl, gfx906)
+// CHK-NO-DEVLIB-NOT: {{[0-9]+}}: input, "{{.*}}devicelib--amd.bc", ir, (device-sycl, gfx906)
+// CHK-NO-DEVLIB: [[LIB2:[0-9]+]]: input, "{{.*}}libsycl-itt-compiler-wrappers.bc", ir, (device-sycl, gfx906)
+// CHK-NO-DEVLIB-NOT: {{[0-9]+}}: input, "{{.*}}devicelib--amd.bc", ir, (device-sycl, gfx906)
+// CHK-NO-DEVLIB: [[LIB3:[0-9]+]]: input, "{{.*}}libsycl-itt-stubs.bc", ir, (device-sycl, gfx906)
+// CHK-NO-DEVLIB-NOT: {{[0-9]+}}: input, "{{.*}}devicelib--amd.bc", ir, (device-sycl, gfx906)
+// CHK-NO-DEVLIB: {{[0-9]+}}: linker, {{{.*}}[[LIB1]], [[LIB2]], [[LIB3]]{{.*}}}, ir, (device-sycl, gfx906)
+
+// Check that the -fsycl-device-lib flag has no effect when "all" is specified.
+// RUN: %clangxx -ccc-print-phases -std=c++11 -fsycl -fsycl-device-lib=all --sysroot=%S/Inputs/SYCL \
+// RUN: -fsycl-targets=amdgcn-amd-amdhsa -Xsycl-target-backend --offload-arch=gfx906 %s 2>&1 \
+// RUN: | FileCheck -check-prefix=CHK-ALL %s
+
+// Check that the -fsycl-device-lib flag has no effect when subsets of libs
+// are specified.
+// RUN: %clangxx -ccc-print-phases -std=c++11 --sysroot=%S/Inputs/SYCL \
+// RUN: -fsycl -fsycl-device-lib=libc,libm-fp32,libm-fp64,libimf-fp32,libimf-fp64,libimf-bf16,libm-bfloat16 \
+// RUN: -fsycl-targets=amdgcn-amd-amdhsa -Xsycl-target-backend --offload-arch=gfx906 %s 2>&1 \
+// RUN: | FileCheck -check-prefix=CHK-ALL %s
+
+// Check that -fno-sycl-device-lib is ignored when it does not contain "all".
+// A warning should be printed that the flag got ignored.
+// RUN: %clangxx -ccc-print-phases -std=c++11 -fsycl --sysroot=%S/Inputs/SYCL \
+// RUN: -fno-sycl-device-lib=libc,libm-fp32,libm-fp64,libimf-fp32,libimf-fp64,libimf-bf16,libm-bfloat16 \
+// RUN: -fsycl-targets=amdgcn-amd-amdhsa -Xsycl-target-backend --offload-arch=gfx906 %s 2>&1 \
+// RUN: | FileCheck -check-prefixes=CHK-UNUSED-WARN,CHK-ALL %s
+
+// CHK-UNUSED-WARN: warning: argument unused during compilation: '-fno-sycl-device-lib='
+// CHK-ALL: [[DEVLIB:[0-9]+]]: input, "{{.*}}devicelib--amd.bc", ir, (device-sycl, gfx906)
+// CHK-ALL: {{[0-9]+}}: linker, {{{.*}}[[DEVLIB]]{{.*}}}, ir, (device-sycl, gfx906)
+

clang/test/Driver/sycl-offload-amdgcn.cpp

@@ -25,7 +25,7 @@
 
 /// Check phases w/out specifying a compute capability.
 // RUN: %clangxx -ccc-print-phases -std=c++11 -target x86_64-unknown-linux-gnu -fsycl \
-// RUN: -fsycl-targets=amdgcn-amd-amdhsa -Xsycl-target-backend --offload-arch=gfx906 %s 2>&1 \
+// RUN: -fsycl-targets=amdgcn-amd-amdhsa -fsycl-device-lib=all -Xsycl-target-backend --offload-arch=gfx906 %s 2>&1 \
 // RUN: | FileCheck -check-prefix=CHK-PHASES-NO-CC %s
 // CHK-PHASES-NO-CC: 0: input, "{{.*}}", c++, (host-sycl)
 // CHK-PHASES-NO-CC: 1: preprocessor, {0}, c++-cpp-output, (host-sycl)