Undo AIX customization in flang-rt cmake because AIX now supports per_target_runttime_dir and add LIT tests.

Author: DanielCChen

clang/lib/Driver/ToolChain.cpp

@@ -782,9 +782,6 @@ std::string ToolChain::getCompilerRT(const ArgList &Args, StringRef Component,
       Path = P;
   }
 
-  if (getTriple().isOSAIX())
-    Path.clear();
-
   // Check the filename for the old layout if the new one does not exist.
   CRTBasename = buildCompilerRTBasename(Args, Component, Type,
                                         /*AddArch=*/!IsFortran, IsFortran);

clang/test/Driver/Inputs/resource_dir_with_per_target_subdir/lib/powerpc64-ibm-aix/libflang_rt.runtime.a

@@ -34,9 +34,8 @@
 function (get_toolchain_library_subdir outvar)
   set(outval "lib")
 
-  if (APPLE OR (UNIX AND CMAKE_SYSTEM_NAME MATCHES "AIX"))
+  if (APPLE)
     # Required to be "darwin" for MachO toolchain.
-    # AIX uses lib/${os_dir} as if LLVM_ENABLE_PER_TARGET_RUNTIME_DIR=OFF
     get_toolchain_os_dirname(os_dirname)
     set(outval "${outval}/${os_dirname}")
   else ()

clang/test/Driver/Inputs/resource_dir_with_per_target_subdir/lib/powerpc64le-unknown-linux-gnu/libflang_rt.runtime.a

@@ -0,0 +1,38 @@
+!! Testing ld command with flang on POWERPC.
+
+!! Because flang-rt currently only supports
+!! LLVM_ENABLE_PER_TARGET_RUNTIME_DIR=ON, use 
+!! resource_dir_with_per_target_subdir as inputs.
+
+! Check powerpc64-ibm-aix 64-bit linking to static flang-rt
+! RUN: %flang %s -### 2>&1 \
+! RUN:        --target=powerpc64-ibm-aix \
+! RUN:        -resource-dir=%S/../../../clang/test/Driver/Inputs/resource_dir_with_per_target_subdir \
+! RUN:   | FileCheck %s --check-prefix=AIX64-LD-PER-TARGET
+
+! AIX64-LD-PER-TARGET-NOT: warning:
+! AIX64-LD-PER-TARGET:     "-fc1" "-triple" "powerpc64-ibm-aix"
+! AIX64-LD-PER-TARGET:     "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+! AIX64-LD-PER-TARGET:     "{{.*}}ld{{(.exe)?}}"
+! AIX64-LD-PER-TARGET-NOT: "-bnso"
+! AIX64-LD-PER-TARGET:     "-b64"
+! AIX64-LD-PER-TARGET:     "-bpT:0x100000000" "-bpD:0x110000000"
+! AIX64-LD-PER-TARGET:     "-lc"
+! AIX64-LD-PER-TARGET:     "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}powerpc64-ibm-aix{{/|\\\\}}libflang_rt.runtime.a"
+! AIX64-LD-PER-TARGET:     "-lm"
+! AIX64-LD-PER-TARGET:     "-lpthread"
+
+! Check powerpc64le-unknown-linux-gnu 64-bit linking to static flang-rt
+! RUN: %flang %s -### 2>&1 \
+! RUN:        --target=powerpc64le-unknown-linux-gnu \
+! RUN:        -resource-dir=%S/../../../clang/test/Driver/Inputs/resource_dir_with_per_target_subdir \
+! RUN:   | FileCheck %s --check-prefixes=LOP64-LD-PER-TARGET
+
+! LOP64-LD-PER-TARGET-NOT: warning:
+! LOP64-LD-PER-TARGET:     "-fc1" "-triple" "powerpc64le-unknown-linux-gnu"
+! LOP64-LD-PER-TARGET:     "-resource-dir" "[[RESOURCE_DIR:[^"]+]]"
+! LOP64-LD-PER-TARGET:     "{{.*}}ld{{(.exe)?}}"
+! LOP64-LD-PER-TARGET-NOT: "-bnso"
+! LOP64-LD-PER-TARGET:     "[[RESOURCE_DIR]]{{/|\\\\}}lib{{/|\\\\}}powerpc64le-unknown-linux-gnu{{/|\\\\}}libflang_rt.runtime.a"
+! LOP64-LD-PER-TARGET:     "-lm"
+! LOP64-LD-PER-TARGET:     "-lc"