[cmake] Explicitly mark libraries defined in lib/ as "Component Libraries"

Summary:
Most libraries are defined in the lib/ directory but there are also a
few libraries defined in tools/ e.g. libLLVM, libLTO.  I'm defining
"Component Libraries" as libraries defined in lib/ that may be included in
libLLVM.so.  Explicitly marking the libraries in lib/ as component
libraries allows us to remove some fragile checks that attempt to
differentiate between lib/ libraries and tools/ libraires:

1. In tools/llvm-shlib, because
llvm_map_components_to_libnames(LIB_NAMES "all") returned a list of
all libraries defined in the whole project, there was custom code
needed to filter out libraries defined in tools/, none of which should
be included in libLLVM.so.  This code assumed that any library
defined as static was from lib/ and everything else should be
excluded.

With this change, llvm_map_components_to_libnames(LIB_NAMES, "all")
only returns libraries that have been added to the LLVM_COMPONENT_LIBS
global cmake property, so this custom filtering logic can be removed.
Doing this also fixes the build with BUILD_SHARED_LIBS=ON
and LLVM_BUILD_LLVM_DYLIB=ON.

2. There was some code in llvm_add_library that assumed that
libraries defined in lib/ would not have LLVM_LINK_COMPONENTS or
ARG_LINK_COMPONENTS set.  This is only true because libraries
defined lib lib/ use LLVMBuild.txt and don't set these values.
This code has been fixed now to check if the library has been
explicitly marked as a component library, which should now make it
easier to remove LLVMBuild at some point in the future.

I have tested this patch on Windows, MacOS and Linux with release builds
and the following combinations of CMake options:

- "" (No options)
- -DLLVM_BUILD_LLVM_DYLIB=ON
- -DLLVM_LINK_LLVM_DYLIB=ON
- -DBUILD_SHARED_LIBS=ON
- -DBUILD_SHARED_LIBS=ON -DLLVM_BUILD_LLVM_DYLIB=ON
- -DBUILD_SHARED_LIBS=ON -DLLVM_LINK_LLVM_DYLIB=ON

Reviewers: beanz, smeenai, compnerd, phosek

Reviewed By: beanz

Subscribers: wuzish, jholewinski, arsenm, dschuff, jyknight, dylanmckay, sdardis, nemanjai, jvesely, nhaehnle, mgorny, mehdi_amini, sbc100, jgravelle-google, hiraditya, aheejin, fedor.sergeev, asb, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, jrtc27, MaskRay, zzheng, edward-jones, atanasyan, steven_wu, rogfer01, MartinMosbeck, brucehoult, the_o, dexonsmith, PkmX, jocewei, jsji, dang, Jim, lenary, s.egerton, pzheng, sameer.abuasal, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70179

4 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/Target/Sparc/AsmParser/CMakeLists.txt b/llvm/lib/Target/Sparc/AsmParser/CMakeLists.txt
index 7579bfed75a..cf8f96bcbb0 100644
--- a/llvm/lib/Target/Sparc/AsmParser/CMakeLists.txt
+++ b/llvm/lib/Target/Sparc/AsmParser/CMakeLists.txt
@@ -1,3 +1,3 @@
-add_llvm_library(LLVMSparcAsmParser
+add_llvm_component_library(LLVMSparcAsmParser
   SparcAsmParser.cpp
   )
diff --git a/llvm/lib/Target/Sparc/Disassembler/CMakeLists.txt b/llvm/lib/Target/Sparc/Disassembler/CMakeLists.txt
index 7359c6a0bcb..b891334d679 100644
--- a/llvm/lib/Target/Sparc/Disassembler/CMakeLists.txt
+++ b/llvm/lib/Target/Sparc/Disassembler/CMakeLists.txt
@@ -1,3 +1,3 @@
-add_llvm_library(LLVMSparcDisassembler
+add_llvm_component_library(LLVMSparcDisassembler
   SparcDisassembler.cpp
   )
diff --git a/llvm/lib/Target/Sparc/MCTargetDesc/CMakeLists.txt b/llvm/lib/Target/Sparc/MCTargetDesc/CMakeLists.txt
index 037099d41b8..311f374a1c1 100644
--- a/llvm/lib/Target/Sparc/MCTargetDesc/CMakeLists.txt
+++ b/llvm/lib/Target/Sparc/MCTargetDesc/CMakeLists.txt
@@ -1,4 +1,4 @@
-add_llvm_library(LLVMSparcDesc
+add_llvm_component_library(LLVMSparcDesc
   SparcAsmBackend.cpp
   SparcELFObjectWriter.cpp
   SparcInstPrinter.cpp
diff --git a/llvm/lib/Target/Sparc/TargetInfo/CMakeLists.txt b/llvm/lib/Target/Sparc/TargetInfo/CMakeLists.txt
index 9633e03a384..42cbe008018 100644
--- a/llvm/lib/Target/Sparc/TargetInfo/CMakeLists.txt
+++ b/llvm/lib/Target/Sparc/TargetInfo/CMakeLists.txt
@@ -1,3 +1,3 @@
-add_llvm_library(LLVMSparcInfo
+add_llvm_component_library(LLVMSparcInfo
   SparcTargetInfo.cpp
   )