0dbcb36394
Summary: For builds with LLVM_BUILD_LLVM_DYLIB=ON and BUILD_SHARED_LIBS=OFF this change makes all symbols in the target specific libraries hidden by default. A new macro called LLVM_EXTERNAL_VISIBILITY has been added to mark symbols in these libraries public, which is mainly needed for the definitions of the LLVMInitialize* functions. This patch reduces the number of public symbols in libLLVM.so by about 25%. This should improve load times for the dynamic library and also make abi checker tools, like abidiff require less memory when analyzing libLLVM.so One side-effect of this change is that for builds with LLVM_BUILD_LLVM_DYLIB=ON and LLVM_LINK_LLVM_DYLIB=ON some unittests that access symbols that are no longer public will need to be statically linked. Before and after public symbol counts (using gcc 8.2.1, ld.bfd 2.31.1): nm before/libLLVM-9svn.so | grep ' [A-Zuvw] ' | wc -l 36221 nm after/libLLVM-9svn.so | grep ' [A-Zuvw] ' | wc -l 26278 Reviewers: chandlerc, beanz, mgorny, rnk, hans Reviewed By: rnk, hans Subscribers: merge_guards_bot, luismarques, smeenai, ldionne, lenary, s.egerton, pzheng, sameer.abuasal, MaskRay, wuzish, echristo, Jim, hiraditya, michaelplatings, chapuni, jholewinski, arsenm, dschuff, jyknight, dylanmckay, sdardis, nemanjai, jvesely, javed.absar, sbc100, jgravelle-google, aheejin, kbarton, fedor.sergeev, asb, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, jrtc27, zzheng, edward-jones, mgrang, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, PkmX, jocewei, kristina, jsji, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D54439
29 lines
1005 B
C++
29 lines
1005 B
C++
//===-- X86TargetInfo.cpp - X86 Target Implementation ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "TargetInfo/X86TargetInfo.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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Target &llvm::getTheX86_32Target() {
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static Target TheX86_32Target;
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return TheX86_32Target;
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}
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Target &llvm::getTheX86_64Target() {
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static Target TheX86_64Target;
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return TheX86_64Target;
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}
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extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeX86TargetInfo() {
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RegisterTarget<Triple::x86, /*HasJIT=*/true> X(
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getTheX86_32Target(), "x86", "32-bit X86: Pentium-Pro and above", "X86");
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RegisterTarget<Triple::x86_64, /*HasJIT=*/true> Y(
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getTheX86_64Target(), "x86-64", "64-bit X86: EM64T and AMD64", "X86");
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}
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