LLVM Driver Multicall tool

This patch adds an llvm-driver multicall tool that can combine multiple
LLVM-based tools. The build infrastructure is enabled for a tool by
adding the GENERATE_DRIVER option to the add_llvm_executable CMake
call, and changing the tool's main function to a canonicalized
tool_name_main format (i.e. llvm_ar_main, clang_main, etc...).

As currently implemented llvm-driver contains dsymutil, llvm-ar,
llvm-cxxfilt, llvm-objcopy, and clang (if clang is included in the
build).

llvm-driver can be enabled from builds by setting
LLVM_TOOL_LLVM_DRIVER_BUILD=On.

There are several limitations in the current implementation, which can
be addressed in subsequent patches:

(1) the multicall binary cannot currently properly handle
multi-dispatch tools. This means symlinking llvm-ranlib to llvm-driver
will not properly result in llvm-ar's main being called.
(2) the multicall binary cannot be comprised of tools containing
conflicting cl::opt options as the global cl::opt option list cannot
contain duplicates.

These limitations can be addressed in subsequent patches.

Differential revision: https://reviews.llvm.org/D109977

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
index 117a63c..aa26215 100644
--- a/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
+++ b/llvm/tools/llvm-objcopy/llvm-objcopy.cpp
@@ -223,7 +223,7 @@ static Error executeObjcopy(ConfigManager &ConfigMgr) {
   return Error::success();
 }
 
-int main(int argc, char **argv) {
+int llvm_objcopy_main(int argc, char **argv) {
   InitLLVM X(argc, argv);
   ToolName = argv[0];