[clang] Add partial-inlining options

Adaptation of adding -fpartial-inlining and -fno-partial-inlining options with GCC.

Author: Jian Yang

clang/include/clang/Driver/Options.td

@@ -3134,6 +3134,10 @@ def fno_inline_functions : Flag<["-"], "fno-inline-functions">, Group<f_clang_Gr
   Visibility<[ClangOption, CC1Option]>;
 def fno_inline : Flag<["-"], "fno-inline">, Group<f_clang_Group>,
   Visibility<[ClangOption, CC1Option]>;
+def fpartial_inlining : Flag<["-"], "fpartial-inlining">, Group<f_clang_Group>,
+  Visibility<[ClangOption, CC1Option]>;
+def fno_partial_inlining : Flag<["-"], "fno-partial-inlining">, Group<f_clang_Group>,
+  Visibility<[ClangOption, CC1Option]>;
 def fno_global_isel : Flag<["-"], "fno-global-isel">, Group<f_clang_Group>,
   HelpText<"Disables the global instruction selector">;
 def fno_experimental_isel : Flag<["-"], "fno-experimental-isel">, Group<f_clang_Group>,

clang/lib/Driver/ToolChains/Clang.cpp

@@ -6923,6 +6923,18 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   Args.AddLastArg(CmdArgs, options::OPT_finline_max_stacksize_EQ);
 
+  // Adaptation of partial-inlining option with GCC.
+  if (Arg *A = Args.getLastArg(options::OPT_fno_partial_inlining,
+                               options::OPT_fpartial_inlining)) {
+    if (A->getOption().matches(options::OPT_fno_partial_inlining)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-disable-partial-inlining");
+    } else if (A->getOption().matches(options::OPT_fpartial_inlining)) {
+      CmdArgs.push_back("-mllvm");
+      CmdArgs.push_back("-enable-partial-inlining");
+    }
+  }
+
   // FIXME: Find a better way to determine whether we are in C++20.
   bool HaveCxx20 =
       Std &&

clang/test/Driver/clang_f_opts.c

@@ -611,3 +611,8 @@
 // CHECK-INT-OBJEMITTER-NOT: unsupported option '-fintegrated-objemitter' for target
 // RUN: not %clang -### -fno-integrated-objemitter --target=x86_64 %s 2>&1 | FileCheck -check-prefix=CHECK-NOINT-OBJEMITTER %s
 // CHECK-NOINT-OBJEMITTER: unsupported option '-fno-integrated-objemitter' for target
+
+// RUN: %clang -### -S -fpartial-inlining %s 2>&1 | FileCheck -check-prefix=CHECK-PARTIAL-INLINING %s
+// CHECK-PARTIAL-INLINING: "-mllvm" "-enable-partial-inlining"
+// RUN: %clang -### -S -fno-partial-inlining %s 2>&1 | FileCheck -check-prefix=CHECK-NO-PARTIAL-INLINING %s
+// CHECK-NO-PARTIAL-INLINING: "-mllvm" "-disable-partial-inlining"