Document option '-rtlib' in clang's man page and help info

This patch adds an entry for "-rtlib" in the output of `man clang` and `clang -help`. Patch by Lei Zhang! Differential Revision: https://reviews.llvm.org/D24069 llvm-svn: 281440
llvm · Sep 14, 2016 · 79e0093 · 79e0093
1 parent 2466239
commit 79e0093
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diff --git a/clang/docs/CommandGuide/clang.rst b/clang/docs/CommandGuide/clang.rst
@@ -105,7 +105,12 @@ Language Selection and Mode Options
 .. option:: -stdlib=<library>
 
  Specify the C++ standard library to use; supported options are libstdc++ and
- libc++.
+ libc++. If not specified, platform default will be used.
+
+.. option:: -rtlib=<library>
+
+ Specify the compiler runtime library to use; supported options are libgcc and
+ compiler-rt. If not specified, platform default will be used.
 
 .. option:: -ansi
 

diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
@@ -1863,7 +1863,8 @@ def resource_dir : Separate<["-"], "resource-dir">,
 def resource_dir_EQ : Joined<["-"], "resource-dir=">, Flags<[DriverOption]>,
   Alias<resource_dir>;
 def rpath : Separate<["-"], "rpath">, Flags<[LinkerInput]>;
-def rtlib_EQ : Joined<["-", "--"], "rtlib=">;
+def rtlib_EQ : Joined<["-", "--"], "rtlib=">,
+  HelpText<"Compiler runtime library to use">;
 def r : Flag<["-"], "r">, Flags<[LinkerInput,NoArgumentUnused]>;
 def save_temps_EQ : Joined<["-", "--"], "save-temps=">, Flags<[DriverOption]>,
   HelpText<"Save intermediate compilation results.">;