diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4179,6 +4179,7 @@
   MarshallingInfoFlag<DiagnosticOpts<"PedanticErrors">>;
 def pedantic : Flag<["-", "--"], "pedantic">, Group<pedantic_Group>, Flags<[CC1Option,FlangOption,FC1Option]>,
   HelpText<"Warn on language extensions">, MarshallingInfoFlag<DiagnosticOpts<"Pedantic">>;
+def p : Flag<["-"], "p">, HelpText<"Enable mcount instrumentation with prof">;
 def pg : Flag<["-"], "pg">, HelpText<"Enable mcount instrumentation">, Flags<[CC1Option]>,
   MarshallingInfoFlag<CodeGenOpts<"InstrumentForProfiling">>;
 def pipe : Flag<["-", "--"], "pipe">,
@@ -4225,7 +4226,6 @@
   LangOpts<"POSIXThreads">, DefaultFalse,
   PosFlag<SetTrue, [], "Support POSIX threads in generated code">,
   NegFlag<SetFalse>, BothFlags<[CC1Option]>>;
-def p : Flag<["-"], "p">;
 def pie : Flag<["-"], "pie">, Group<Link_Group>;
 def static_pie : Flag<["-"], "static-pie">, Group<Link_Group>;
 def read__only__relocs : Separate<["-"], "read_only_relocs">;
diff --git a/clang/lib/Driver/ToolChains/AIX.cpp b/clang/lib/Driver/ToolChains/AIX.cpp
--- a/clang/lib/Driver/ToolChains/AIX.cpp
+++ b/clang/lib/Driver/ToolChains/AIX.cpp
@@ -271,7 +271,7 @@
 
     CmdArgs.push_back("-lc");
 
-    if (Args.hasArg(options::OPT_pg)) {
+    if (Args.hasArg(options::OPT_p, options::OPT_pg)) {
       CmdArgs.push_back(Args.MakeArgString((llvm::Twine("-L") + D.SysRoot) +
                                            "/lib/profiled"));
       CmdArgs.push_back(Args.MakeArgString((llvm::Twine("-L") + D.SysRoot) +
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -6331,7 +6331,9 @@
     }
   }
   if (Arg *A = Args.getLastArgNoClaim(options::OPT_p)) {
-    if (!TC.getTriple().isOSAIX() && !TC.getTriple().isOSOpenBSD()) {
+    if (TC.getTriple().isOSAIX()) {
+      CmdArgs.push_back("-pg");
+    } else if (!TC.getTriple().isOSOpenBSD()) {
       D.Diag(diag::err_drv_unsupported_opt_for_target)
           << A->getAsString(Args) << TripleStr;
     }
diff --git a/clang/test/Driver/aix-ld.c b/clang/test/Driver/aix-ld.c
--- a/clang/test/Driver/aix-ld.c
+++ b/clang/test/Driver/aix-ld.c
@@ -135,6 +135,8 @@
 // CHECK-LD32-PROF-NOT: "--no-as-needed"
 // CHECK-LD32-PROF-NOT: "-lm"
 // CHECK-LD32-PROF:     "-lc"
+// CHECK-LD32-PROF:     "-L[[SYSROOT]]/lib/profiled"
+// CHECK-LD32-PROF:     "-L[[SYSROOT]]/usr/lib/profiled"
 
 // Check powerpc64-ibm-aix7.1.0.0, 64-bit. Enable profiling.
 // RUN: %clang %s -### 2>&1 \
@@ -162,6 +164,8 @@
 // CHECK-LD64-PROF-NOT: "--no-as-needed"
 // CHECK-LD64-PROF-NOT: "-lm"
 // CHECK-LD64-PROF:     "-lc"
+// CHECK-LD64-PROF:     "-L[[SYSROOT]]/lib/profiled"
+// CHECK-LD64-PROF:     "-L[[SYSROOT]]/usr/lib/profiled
 
 // Check powerpc-ibm-aix7.1.0.0, 32-bit. Enable g-profiling.
 // RUN: %clang %s -### 2>&1 \