[PATCH] D58326: [Driver][Gnu] Support -nolibc flag

[Eric Christopher via cfe-commits]

Weird. Ok.

On Sat, Feb 16, 2019, 5:20 PM Petr Hosek via Phabricator <
reviews at reviews.llvm.org> wrote:

> phosek created this revision.
> phosek added reviewers: echristo, mcgrathr.
> Herald added a project: clang.
> Herald added a subscriber: cfe-commits.
>
> This can be used to disable libc linking. This flag is supported by
> GCC since version 9 as well as some Clang target toolchains.
>
>
> Repository:
>   rC Clang
>
> https://reviews.llvm.org/D58326
>
> Files:
>   clang/lib/Driver/ToolChains/Gnu.cpp
>   clang/test/Driver/nodefaultlib.c
>   clang/test/Driver/nolibc.c
>
>
> Index: clang/test/Driver/nolibc.c
> ===================================================================
> --- /dev/null
> +++ clang/test/Driver/nolibc.c
> @@ -0,0 +1,5 @@
> +// RUN: %clang -target i686-pc-linux-gnu -### -rtlib=libgcc -nolibc %s
> 2>&1 | FileCheck %s
> +// CHECK: crtbegin
> +// CHECK: "-lgcc"
> +// CHECK-NOT: "-lc"
> +// CHECK: crtend
> Index: clang/test/Driver/nodefaultlib.c
> ===================================================================
> --- clang/test/Driver/nodefaultlib.c
> +++ clang/test/Driver/nodefaultlib.c
> @@ -1,4 +1,4 @@
> -// RUN: %clang -target i686-pc-linux-gnu -### -nodefaultlibs %s 2>&1 |
> FileCheck -check-prefix=TEST1 %s
> +// RUN: %clang -target i686-pc-linux-gnu -### -rtlib=libgcc
> -nodefaultlibs %s 2>&1 | FileCheck -check-prefix=TEST1 %s
>  // TEST1-NOT: start-group
>  // TEST1-NOT: "-lgcc"
>  // TEST1-NOT: "-lc"
> Index: clang/lib/Driver/ToolChains/Gnu.cpp
> ===================================================================
> --- clang/lib/Driver/ToolChains/Gnu.cpp
> +++ clang/lib/Driver/ToolChains/Gnu.cpp
> @@ -518,7 +518,8 @@
>        if (Args.hasArg(options::OPT_fsplit_stack))
>          CmdArgs.push_back("--wrap=pthread_create");
>
> -      CmdArgs.push_back("-lc");
> +      if (!Args.hasArg(options::OPT_nolibc))
> +        CmdArgs.push_back("-lc");
>
>        // Add IAMCU specific libs, if needed.
>        if (IsIAMCU)
>
>
>
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