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[LTO] Make sure symbol ordering is honoured.

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We do this emitting a section for every function when LTO is used.
Fixes PR33888.

Differential Revision:  https://reviews.llvm.org/D35809

llvm-svn: 308915
This commit is contained in:
Davide Italiano 2017-07-24 19:38:13 +00:00
parent 1fd0c7e598
commit 1f4e29c71d
3 changed files with 38 additions and 0 deletions
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3
lld/ELF/LTO.cpp
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@ -73,6 +73,9 @@ static std::unique_ptr<lto::LTO> createLTO() {
Conf.Options = InitTargetOptionsFromCodeGenFlags();
Conf.Options.RelaxELFRelocations = true;
// Always emit a section per function with LTO.
Conf.Options.FunctionSections = true;
if (Config->Relocatable)
Conf.RelocModel = None;
else if (Config->Pic)

10
lld/test/ELF/lto/Inputs/symbol-ordering-lto.ll Normal file
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@ -0,0 +1,10 @@
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-scei-ps4"
define i32 @tin() {
ret i32 22
}
define i32 @pat() {
ret i32 42
}

25
lld/test/ELF/lto/symbol-ordering-lto.s Normal file
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@ -0,0 +1,25 @@
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-scei-ps4 %s -o %t.o
# RUN: llvm-as %p/Inputs/symbol-ordering-lto.ll -o %t.bc
# Set up the symbol file
# RUN: echo "tin " > %t_order_lto.txt
# RUN: echo "_start " >> %t_order_lto.txt
# RUN: echo "pat " >> %t_order_lto.txt
# RUN: ld.lld --symbol-ordering-file %t_order_lto.txt %t.o %t.bc -o %t2.out
# RUN: llvm-readobj -elf-output-style=GNU -t %t2.out| FileCheck %s
# Check that the order is pat -> _start -> tin.
# CHECK: Symbol table '.symtab' contains 4 entries:
# CHECK-NEXT: Num: Value Size Type Bind Vis Ndx Name
# CHECK-NEXT: 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
# CHECK-NEXT: 1: 0000000000201008 0 NOTYPE GLOBAL DEFAULT 1 _start
# CHECK-NEXT: 2: 0000000000201020 6 FUNC GLOBAL DEFAULT 1 pat
# CHECK-NEXT: 3: 0000000000201000 6 FUNC GLOBAL DEFAULT 1 tin
.globl _start
_start:
call pat
call tin