[yaml2obj] - ProgramHeaders: introduce FirstSec/LastSec instead of Sections list.

Imagine we have a YAML declaration of few sections: `foo1`, `<unnamed 2>`, `foo3`, `foo4`.

To put them into segment

[yaml2obj] - ProgramHeaders: introduce FirstSec/LastSec instead of Sections list.

Imagine we have a YAML declaration of few sections: `foo1`, `<unnamed 2>`, `foo3`, `foo4`.

To put them into segment we can do (1*):

```
Sections:
- Section: foo1
- Section: foo4
```

or we can use (2*):

```
Sections:
- Section: foo1
- Section: foo3
- Section: foo4
```

or (3*) :

```
Sections:
- Section: foo1
## "(index 2)" here is a name that we automatically created for a unnamed section.
- Section: (index 2)
- Section: foo3
- Section: foo4
```

It looks really confusing that we don't have to list all of sections.

At first I've tried to make this rule stricter and report an error when there is a gap
(i.e. when a section is included into segment, but not listed explicitly).
This did not work perfect, because such approach conflicts with unnamed sections/fills (see (3*)).

This patch drops "Sections" key and introduces 2 keys instead: `FirstSec` and `LastSec`.
Both are optional.

Differential revision: https://reviews.llvm.org/D90458

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[yaml2obj][obj2yaml] - Do not create a symbol table by default.

This patch tries to resolve problems faced in D68943
and uses some of the code written by Konrad Wilhelm Kleine
in that patch.

Previo

[yaml2obj][obj2yaml] - Do not create a symbol table by default.

This patch tries to resolve problems faced in D68943
and uses some of the code written by Konrad Wilhelm Kleine
in that patch.

Previously, yaml2obj tool always created a .symtab section.
This patch changes that. With it we only create it when
have a "Symbols:" tag in the YAML document or when
we need to create it because it is used by another section(s).

obj2yaml follows the new behavior and does not print "Symbols:"
anymore when there is no symbol table.

Differential revision: https://reviews.llvm.org/D69041

llvm-svn: 375361

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[llvm-objcopy] Allow strip symtab in executables and DSOs

Re-commit of the patch after addressing -Wl,--emit-relocs case.
Differential revision: https://reviews.llvm.org/D61672

llvm-svn: 366787

Revert [llvm-objcopy] Allow strip symtab from executables and DSOs

This reverts r365193 (git commit 194f16b3548bcb23a7f0fd638778ed72edd18d37)

This patch doesn't work with binaries built w/ `--emit-

Revert [llvm-objcopy] Allow strip symtab from executables and DSOs

This reverts r365193 (git commit 194f16b3548bcb23a7f0fd638778ed72edd18d37)

This patch doesn't work with binaries built w/ `--emit-relocs`, e.g.

```
$ echo 'int main() { return 0; }' | clang -Wl,--emit-relocs -x c - -o foo && llvm-objcopy --strip-unneeded foo
llvm-objcopy: error: 'foo': not stripping symbol '__gmon_start__' because it is named in a relocation
```

llvm-svn: 365712

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[llvm-objcopy] Allow strip symtab from executables and DSOs

Differential revision: https://reviews.llvm.org/D61672

llvm-svn: 365193

[NFC][llvm-objcopy] Fix overly restrictive od output check

The check against the output of `od` in the affected tests expect a
specific input offset format. They also expect a specific offset value,

[NFC][llvm-objcopy] Fix overly restrictive od output check

The check against the output of `od` in the affected tests expect a
specific input offset format. They also expect a specific offset value,
not consistent with the EXAMPLE section for `od` in POSIX.1-2017
Chapter 4, while using the `-j` option. In particular, the example shows
that the input offset begins at 0 following the bytes skipped.

This patch adjusts the matching of the input offset to be more generic.
In order to avoid false matches, it restricts the number of bytes to be
formatted.

llvm-svn: 363829

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[llvm-objcopy][NFC] Consistenly use two dashes for flags in tests.

Summary:
As pointed out in D53667, our use of hyphens in flags can be inconsistent, mixing `-` with `--`. This change makes all lon

[llvm-objcopy][NFC] Consistenly use two dashes for flags in tests.

Summary:
As pointed out in D53667, our use of hyphens in flags can be inconsistent, mixing `-` with `--`. This change makes all long style flags use `--`.

Automatically changed via:

```
find test/tools/llvm-objcopy/ELF -type f | xargs sed -i 's/ -\([a-zA-Z]\{3\}\)/ --\1/g'
```

Two false positives were manually fixed/reverted.

Reviewers: jhenderson, espindola, alexshap

Reviewed By: jhenderson

Subscribers: emaste, javed.absar, arichardson, fedor.sergeev, jakehehrlich, llvm-commits

Differential Revision: https://reviews.llvm.org/D56513

llvm-svn: 350944

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[llvm-objcopy] Move elf-specific tests into subfolder

In this diff the elf-specific tests are moved into the subfolder llvm-objcopy/ELF
(the change was discussed in the comments on https://reviews.l

[llvm-objcopy] Move elf-specific tests into subfolder

In this diff the elf-specific tests are moved into the subfolder llvm-objcopy/ELF
(the change was discussed in the comments on https://reviews.llvm.org/D54674).
A separate code reivew wasn't sent for this change
since Phabricator is failing to create such a large diff.

Test plan:
make check-all
make check-llvm-tools
make check-llvm-tools-llvm-objcopy

llvm-svn: 347958

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