[PATCH] D64547: [Driver] -noprofilelib flag

[Petr Hosek via Phabricator via llvm-commits]

phosek created this revision.
phosek added reviewers: smeenai, davidxl.
Herald added projects: LLVM, Sanitizers.
Herald added subscribers: Sanitizers, llvm-commits.

This flag is analoguous to other flags like -nostdlib or -nolibc
and could be used to disable linking of profile runtime library.
This is useful in certain environments like kernel, where profile
instrumentation is still desirable, but we cannot use the standard
runtime library.


Repository:
  rCRT Compiler Runtime

https://reviews.llvm.org/D64547

Files:
  clang/docs/ClangCommandLineReference.rst
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChain.cpp
  clang/test/Driver/noprofilelib.c


Index: clang/test/Driver/noprofilelib.c
===================================================================
--- /dev/null
+++ clang/test/Driver/noprofilelib.c
@@ -0,0 +1,5 @@
+// RUN: %clang -target i686-pc-linux-gnu -### %s 2>&1 \
+// RUN:     -fprofile-generate -noprofilelib | FileCheck %s
+// RUN: %clang -target i686-pc-linux-gnu -### %s 2>&1 \
+// RUN:     -fprofile-instr-generate -noprofilelib | FileCheck %s
+// CHECK-NOT: clang_rt.profile
Index: clang/lib/Driver/ToolChain.cpp
===================================================================
--- clang/lib/Driver/ToolChain.cpp
+++ clang/lib/Driver/ToolChain.cpp
@@ -450,6 +450,9 @@
 }
 
 bool ToolChain::needsProfileRT(const ArgList &Args) {
+  if (Args.hasArg(options::OPT_noprofilelib))
+    return false;
+
   if (needsGCovInstrumentation(Args) ||
       Args.hasArg(options::OPT_fprofile_generate) ||
       Args.hasArg(options::OPT_fprofile_generate_EQ) ||
Index: clang/include/clang/Driver/Options.td
===================================================================
--- clang/include/clang/Driver/Options.td
+++ clang/include/clang/Driver/Options.td
@@ -2512,6 +2512,7 @@
 def nopie : Flag<["-"], "nopie">;
 def no_pie : Flag<["-"], "no-pie">, Alias<nopie>;
 def noprebind : Flag<["-"], "noprebind">;
+def noprofilelib : Flag<["-"], "noprofilelib">;
 def noseglinkedit : Flag<["-"], "noseglinkedit">;
 def nostartfiles : Flag<["-"], "nostartfiles">;
 def nostdinc : Flag<["-"], "nostdinc">, Flags<[CoreOption]>;
Index: clang/docs/ClangCommandLineReference.rst
===================================================================
--- clang/docs/ClangCommandLineReference.rst
+++ clang/docs/ClangCommandLineReference.rst
@@ -346,6 +346,8 @@
 
 .. option:: -noprebind
 
+.. option:: -noprofilelib
+
 .. option:: -noseglinkedit
 
 .. option:: -nostartfiles


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