[PATCH] D64547: [Driver] -noprofilelib flag

[Filipe Cabecinhas via llvm-commits]

Why does -nodefaultlibs work for your use case?

Thank you,
 Filipe

On Thu, 11 Jul 2019 at 08:11, Petr Hosek via Phabricator <
reviews at reviews.llvm.org> wrote:

> 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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