[Flang][AMDGPU] Add rocm-path flag (#88190)

ROCm installation path is used for finding and automatically linking
required bitcode libraries for OpenMP AMDGPU offload.

Reported issue: #82553

Author: DominikAdamski

clang/include/clang/Driver/Options.td

@@ -1341,7 +1341,8 @@ def hip_link : Flag<["--"], "hip-link">, Group<opencl_Group>,
   HelpText<"Link clang-offload-bundler bundles for HIP">;
 def no_hip_rt: Flag<["-"], "no-hip-rt">, Group<hip_Group>,
   HelpText<"Do not link against HIP runtime libraries">;
-def rocm_path_EQ : Joined<["--"], "rocm-path=">, Group<hip_Group>,
+def rocm_path_EQ : Joined<["--"], "rocm-path=">,
+  Visibility<[FlangOption]>, Group<hip_Group>,
   HelpText<"ROCm installation path, used for finding and automatically linking required bitcode libraries.">;
 def hip_path_EQ : Joined<["--"], "hip-path=">, Group<hip_Group>,
   HelpText<"HIP runtime installation path, used for finding HIP version and adding HIP include path.">;

flang/test/Driver/Inputs/rocm/amdgcn/bitcode-no-abi-ver/asanrtl.bc

@@ -0,0 +1,6 @@
+# Auto-generated by cmake
+# NOTE: The trailing whitespace is added on purpose to verify that these
+# whitespaces are trimmed before paring.
+HIP_VERSION_MAJOR=3 
+HIP_VERSION_MINOR=6
+HIP_VERSION_PATCH=20214-a2917cd

flang/test/Driver/Inputs/rocm/amdgcn/bitcode-no-abi-ver/hip.bc

@@ -0,0 +1,6 @@
+# Auto-generated by cmake
+# NOTE: The trailing whitespace is added on purpose to verify that these
+# whitespaces are trimmed before paring.
+HIP_VERSION_MAJOR=3 
+HIP_VERSION_MINOR=6
+HIP_VERSION_PATCH=20214-a2917cd

flang/test/Driver/Inputs/rocm/amdgcn/bitcode-no-abi-ver/ockl.bc

@@ -148,6 +148,7 @@
 ! CHECK-NEXT: -pthread                Support POSIX threads in generated code
 ! CHECK-NEXT: -P                      Disable linemarker output in -E mode
 ! CHECK-NEXT: -resource-dir <value>   The directory which holds the compiler resource files
+! CHECK-NEXT: --rocm-path=<value> ROCm installation path, used for finding and automatically linking required bitcode libraries.
 ! CHECK-NEXT: -Rpass-analysis=<value> Report transformation analysis from optimization passes whose name matches the given POSIX regular expression
 ! CHECK-NEXT: -Rpass-missed=<value>   Report missed transformations by optimization passes whose name matches the given POSIX regular expression
 ! CHECK-NEXT: -Rpass=<value>          Report transformations performed by optimization passes whose name matches the given POSIX regular expression

flang/test/Driver/Inputs/rocm/amdgcn/bitcode-no-abi-ver/oclc_correctly_rounded_sqrt_off.bc

@@ -135,6 +135,7 @@
 ! HELP-NEXT: -print-target-triple    Print the normalized target triple
 ! HELP-NEXT: -pthread                Support POSIX threads in generated code
 ! HELP-NEXT: -P                      Disable linemarker output in -E mode
+! HELP-NEXT:  --rocm-path=<value> ROCm installation path, used for finding and automatically linking required bitcode libraries.
 ! HELP-NEXT: -Rpass-analysis=<value> Report transformation analysis from optimization passes whose name matches the given POSIX regular expression
 ! HELP-NEXT: -Rpass-missed=<value>   Report missed transformations by optimization passes whose name matches the given POSIX regular expression
 ! HELP-NEXT: -Rpass=<value>          Report transformations performed by optimization passes whose name matches the given POSIX regular expression

flang/test/Driver/Inputs/rocm/amdgcn/bitcode-no-abi-ver/oclc_correctly_rounded_sqrt_on.bc

@@ -201,3 +201,9 @@
 ! RUN:      -nogpulibc %s 2>&1 \
 ! RUN:   | FileCheck --check-prefix=NO-LIBC-GPU-AMDGPU %s
 ! NO-LIBC-GPU-AMDGPU-NOT: "-lcgpu-amdgpu"
+
+! RUN:   %flang -### -v --target=x86_64-unknown-linux-gnu -fopenmp  \
+! RUN:      --offload-arch=gfx900 \
+! RUN:      --rocm-path=%S/Inputs/rocm %s 2>&1 \
+! RUN:   | FileCheck --check-prefix=ROCM-PATH %s
+! ROCM-PATH: Found HIP installation: {{.*Inputs.*rocm}}, version 3.6.20214-a2917cd