Revert r309252 "[ELF] - Fix missing relocation when linking executable with --unresolved-symbols=ignore-all"

It broke bot:
http://lab.llvm.org:8011/builders/clang-with-thin-lto-ubuntu/builds/4231

llvm-svn: 309258

llvm-svn: 309254

That is slightly more convinent as allows to store pointer on
program header entry in a more safe way.
 
Change was used in 2 patches currently on review.

Differential revision: https://reviews.llvm.org/D35832

llvm-svn: 309253

This is PR32112. Previously when we linked executable with 
--unresolved-symbols=ignore-all and undefined symbols, like:

_start:
callq und@PLT

we did not create relocations, though it looks in that case
we should delegate handling of such symbols to runtime linker,
hence should emit them. Patch fixes that.

Differential revision: https://reviews.llvm.org/D35724

llvm-svn: 309252

With this we only ask LTO to keep a C named section if there is a
__start_ or __end symbol.

This is not as strict as lld's --gc-sections, but is as good as we can
get without having a far more detailed ir summary.

llvm-svn: 309232

It is __stop_<sec>, not __end_<sec>.

llvm-svn: 309225

Rename it because it was too easy to conflict with llvm::object::ObjectFile
which broke buildbots several times.

llvm-svn: 309199

This patch fixes a small issue with respect to how memory region names
are parsed on output section descriptions.  For example, consider:

  .text : { *(.text) } > rom

That can also be written like:

  .text : { *(.text) } >rom

The latter form is accepted by GNU LD and is fairly common.

Differential Revision: https://reviews.llvm.org/D35920

llvm-svn: 309191

llvm-svn: 309188

I believe this compiles fine on all platforms, even on Windows.

llvm-svn: 309182

llvm-svn: 309162

llvm-svn: 309161

llvm-svn: 309160

llvm-svn: 309153

NFC, just makes it easier to access from non templated code.

llvm-svn: 309152

Was discussed in D35797 thread.

llvm-svn: 309096

Previously we handled this option implicitly, only
for infering unresolved symbols handling policy.

ld man says: "--noinhibit-exec Retain the executable
output file whenever it is still usable",
and we may want to handle other cases too.

Differential revision: https://reviews.llvm.org/D35793

llvm-svn: 309091

This is PR30422,
previously LLD did not render all option aliases in --help.
With this patch it will.

Differential revision: https://reviews.llvm.org/D35477

llvm-svn: 309089

Since the flag is ignored anyway, it doesn't matter whether
it is an alias or not.

llvm-svn: 309055

llvm-svn: 309053

llvm-svn: 309051

These can be referenced with __start_/__stop_ symbols. I will try to make
this more precise in a followup patch.

llvm-svn: 309048

This is PR33714.

Previously for each input section offset of memory region
was incremented on a size of output section.

That resulted in a wrong error message saying about
overflow. Patch fixes that.

Differential revision: https://reviews.llvm.org/D35803

llvm-svn: 308955

llvm-svn: 308939

If user requested section alignment is greater than MaxPageSize, propagate it to segment headers correctly.

Differential Revision: https://reviews.llvm.org/D35813

llvm-svn: 308930

Follow-up to r308915 suggested by Rafael and Peter.

llvm-svn: 308920

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

llvm-svn: 308812

llvm-svn: 308809

Eq helper allows to define `XXX` and `XXX=` options forms easily.
Patch adds testcases for few aliases.

Differential revision: https://reviews.llvm.org/D35619

llvm-svn: 308752

Differential Revision: https://reviews.llvm.org/D35537

llvm-svn: 308728

This method is no longer being used anywhere.

Differential Revision: https://reviews.llvm.org/D35706

llvm-svn: 308706

Also add the test cases for the addition and subtraction both for
the relative and absolute case.

Differential Revision: https://reviews.llvm.org/D35346

llvm-svn: 308692

We were not looking at Repl and so thinking there was no output
section associated with the merged symbol. Because of that it was
produced as absolute.

This was found by an internal round of testing.

llvm-svn: 308681

SHF_GROUP flag should have been removed when the control reaches here
because InputSectionBase turns the flag off. So this code should be
redundant.

llvm-svn: 308680

Summary:
If the linker is invoked with `--chroot /foo` and `/bar/baz.o`, it
tries to read the file from `/foo/bar/baz.o`. This feature is useful
when you are dealing with files created by the --reproduce option.

Reviewers: grimar

Subscribers: llvm-commits, emaste

Differential Revision: https://reviews.llvm.org/D35517

llvm-svn: 308646

With that in place we can use lld's own infrastructure for the low
level detail of dwarf parsing.

With this we don't decompress sections twice, we don't scan all
realocations and even with this simplistic implementation linking
clang with gdb index goes from 34.09 seconds to 20.80 seconds.

llvm-svn: 308544

llvm-svn: 308529

llvm-svn: 308526

llvm-svn: 308523