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Add -{no,}-check-sections flags to enable/disable section overlchecking 

GNU linkers have this option.

Differential Revision: https://reviews.llvm.org/D42858

llvm-svn: 324150
This commit is contained in:
Rui Ueyama 2018-02-02 22:24:06 +00:00
parent 38af2eed51
commit 6a8e79b8e5
5 changed files with 12 additions and 2 deletions
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1
lld/ELF/Config.h
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@ -112,6 +112,7 @@ struct Configuration {
bool AsNeeded = false;
bool Bsymbolic;
bool BsymbolicFunctions;
bool CheckSections;
bool CompressDebugSections;
bool DefineCommon;
bool Demangle = true;

2
lld/ELF/Driver.cpp
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@ -600,6 +600,8 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
Config->AuxiliaryList = args::getStrings(Args, OPT_auxiliary);
Config->Bsymbolic = Args.hasArg(OPT_Bsymbolic);
Config->BsymbolicFunctions = Args.hasArg(OPT_Bsymbolic_functions);
Config->CheckSections =
Args.hasFlag(OPT_check_sections, OPT_no_check_sections, true);
Config->Chroot = Args.getLastArgValue(OPT_chroot);
Config->CompressDebugSections = getCompressDebugSections(Args);
Config->DefineCommon = Args.hasFlag(OPT_define_common, OPT_no_define_common,

4
lld/ELF/Options.td
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@ -31,6 +31,10 @@ def build_id: F<"build-id">, HelpText<"Generate build ID note">;
def build_id_eq: J<"build-id=">, HelpText<"Generate build ID note">;
defm check_sections : B<"check-sections",
"Check section addresses for overlaps",
"Do not check section addresses for overlaps">;
defm compress_debug_sections : Eq<"compress-debug-sections">,
HelpText<"Compress DWARF debug sections">;

3
lld/ELF/Writer.cpp
View File

@ -455,7 +455,8 @@ template <class ELFT> void Writer<ELFT>::run() {
Sec->Addr = 0;
}
checkNoOverlappingSections();
if (Config->CheckSections)
checkNoOverlappingSections();
// It does not make sense try to open the file if we have error already.
if (errorCount())

4
lld/test/ELF/linkerscript/overlapping-sections.s
View File

@ -66,8 +66,10 @@
# LMA-OVERLAP-ERR-NEXT: >>> .sec1 range is [0x8000 -> 0x80FF]
# LMA-OVERLAP-ERR-NEXT: >>> .sec2 range is [0x8080 -> 0x817F]
# check that we create the expected binary with --noinhibit-exec:
# Check that we create the expected binary with --noinhibit-exec or --no-check-sections:
# RUN: ld.lld -o %t.so --script %t-lma.script %t.o -shared --noinhibit-exec
# RUN: ld.lld -o %t.so --script %t-lma.script %t.o -shared --no-check-sections
# RUN: ld.lld -o %t.so --script %t-lma.script %t.o -shared --check-sections --no-check-sections
# Verify that the .sec2 was indeed placed in a PT_LOAD where the PhysAddr
# overlaps with where .sec1 is loaded: