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Allow suppressing host and target info in VersionPrinter

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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

llvm-svn: 300630
This commit is contained in:
Xin Tong 2017-04-19 00:03:36 +00:00
parent b65c650066
commit dc8dd17743
3 changed files with 10 additions and 1 deletions
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3
CMakeLists.txt
View File

@ -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.

3
include/llvm/Config/config.h.cmake
View File

@ -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}

5
lib/Support/CommandLine.cpp
View File

@ -2069,12 +2069,15 @@ public:
#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)