From 35e5e58dc5002b68821aaf336fd9e5df8d15a976 Mon Sep 17 00:00:00 2001
From: Xin Tong <trent.xin.tong@gmail.com>
Date: Wed, 19 Apr 2017 00:03:36 +0000
Subject: [PATCH] Allow suppressing host and target info in VersionPrinter

Summary:
VersionPrinter by default outputs information about the Host CPU
and Default target. Printing this information requires linking in
a large amount of data, such as supported target triples as C
strings, which in turn bloats the binary size.

Enable a new CMake option LLVM_VERSION_PRINTER_SHOW_HOST_TARGET_INFO
which controls printing of the host and target info. This allows
the target triple names to be dead-code stripped. This is a nice
win for LLVM clients that wish to minimize their binary size, such
as graphics drivers.

By default this is ON, so there is no change in the default behavior.
Clients who wish to suppress this printing can do so by setting this
option to off via CMake.

A test app on Linux that uses ParseCommandLineOptions() shows a binary
size reduction of 23KB (from 149K to 126K) for a Release build, and 24KB
(from 135K to 111K) in a MinSizeRel build.

Reviewers: klimek, beanz, bogner, chandlerc, compnerd

Reviewed By: compnerd

Patch by pammon (Peter Ammon) !

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D30904

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@300630 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CMakeLists.txt                     | 3 +++
 include/llvm/Config/config.h.cmake | 3 +++
 lib/Support/CommandLine.cpp        | 5 ++++-
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b51bc421fdbf..2f5df776e9e0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -512,6 +512,9 @@ set(LLVM_INSTALL_OCAMLDOC_HTML_DIR "share/doc/llvm/ocaml-html"
 option (LLVM_BUILD_EXTERNAL_COMPILER_RT
   "Build compiler-rt as an external project." OFF)
 
+option (LLVM_VERSION_PRINTER_SHOW_HOST_TARGET_INFO
+  "Show target and host info when tools are invoked with --version." ON)
+
 # You can configure which libraries from LLVM you want to include in the
 # shared library by setting LLVM_DYLIB_COMPONENTS to a semi-colon delimited
 # list of LLVM components. All component names handled by llvm-config are valid.
diff --git a/include/llvm/Config/config.h.cmake b/include/llvm/Config/config.h.cmake
index 236fae2c9166..a64e208fa784 100644
--- a/include/llvm/Config/config.h.cmake
+++ b/include/llvm/Config/config.h.cmake
@@ -386,6 +386,9 @@
 /* LLVM version information */
 #cmakedefine LLVM_VERSION_INFO "${LLVM_VERSION_INFO}"
 
+/* Whether tools show host and target info when invoked with --version */
+#cmakedefine01 LLVM_VERSION_PRINTER_SHOW_HOST_TARGET_INFO
+
 /* Major version of the LLVM API */
 #define LLVM_VERSION_MAJOR ${LLVM_VERSION_MAJOR}
 
diff --git a/lib/Support/CommandLine.cpp b/lib/Support/CommandLine.cpp
index f4a9108b8544..34345901eab1 100644
--- a/lib/Support/CommandLine.cpp
+++ b/lib/Support/CommandLine.cpp
@@ -2069,12 +2069,15 @@ class VersionPrinter {
 #ifndef NDEBUG
     OS << " with assertions";
 #endif
+#if LLVM_VERSION_PRINTER_SHOW_HOST_TARGET_INFO
     std::string CPU = sys::getHostCPUName();
     if (CPU == "generic")
       CPU = "(unknown)";
     OS << ".\n"
        << "  Default target: " << sys::getDefaultTargetTriple() << '\n'
-       << "  Host CPU: " << CPU << '\n';
+       << "  Host CPU: " << CPU;
+#endif
+    OS << '\n';
   }
   void operator=(bool OptionWasSpecified) {
     if (!OptionWasSpecified)