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James Henderson 21e157896b [CommandLine] Don't print empty sentinel values from EnumValN lists in help text 
In order to make an option value truly optional, both the ValueOptional
attribute and an empty-named value are required. Prior to this change,
this empty-named value appears in the command-line help text:

-some-option - some help text
  =v1        - description 1
  =v2        - description 2
  =          -

This change improves the help text for these sort of options in a number
of ways:

1) ValueOptional options with an empty-named value now print their help
   text twice: both without and then with '=<value>' after the name. The
   latter version then lists the allowed values after it.
2) Empty-named values with no help text in ValueOptional options are not
   listed in the permitted values.

-some-option         - some help text
-some-option=<value> - some help text
  =v1                - description 1
  =v2                - description 2

3) Otherwise empty-named options are printed as =<empty> rather than
   simply '='.
4) Option values without help text do not have the '-' separator
   printed.

-some-option=<value> - some help text
  =v1                - description 1
  =v2
  =<empty>           - description

It also tweaks the llvm-symbolizer -functions help text to not print a
trailing ':' as that looks bad combined with 1) above.

This is mostly a reland of r352750.

Reviewed by: ruiu, thopre, mstorsjo

Differential Revision: https://reviews.llvm.org/D57030

llvm-svn: 353048
2019-02-04 14:48:33 +00:00
benchmarks Pull google/benchmark library to the LLVM tree 2018-08-28 09:42:41 +00:00
bindings Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
cmake Revert "Bump minimum toolchain version" 2019-02-02 06:01:12 +00:00
docs [llvm-exegesis] Don't default to running&dumping all analyses to '-' 2019-02-04 09:12:08 +00:00
examples Fix compilation of examples after 13680223b9d8 / r352827 2019-02-01 03:23:42 +00:00
include [AsmPrinter] Remove hidden flag -print-schedule. 2019-02-04 12:51:26 +00:00
lib [CommandLine] Don't print empty sentinel values from EnumValN lists in help text 2019-02-04 14:48:33 +00:00
projects Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
resources
runtimes Revert "[CMake] Use __libc_start_main rather than fopen when checking for C library" 2019-01-28 19:26:41 +00:00
test AMDGPU/GlobalISel: Legalize select for v4s16 2019-02-04 14:04:52 +00:00
tools [CommandLine] Don't print empty sentinel values from EnumValN lists in help text 2019-02-04 14:48:33 +00:00
unittests [CommandLine] Don't print empty sentinel values from EnumValN lists in help text 2019-02-04 14:48:33 +00:00
utils [X86] Print %st(0) as %st when its implicit to the instruction. Continue printing it as %st(0) when its encoded in the instruction. 2019-02-04 04:15:10 +00:00
.arcconfig [llvm] Set up .arcconfig to point to Diffusion L repository 2018-01-12 15:37:41 +00:00
.clang-format
.clang-tidy Disable tidy checks with too many hits 2019-02-01 11:20:13 +00:00
.gitattributes [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 2018-05-09 02:40:45 +00:00
.gitignore gitignore: ignore clangd index files. 2019-01-25 14:05:18 +00:00
CMakeLists.txt Revert "Bump minimum toolchain version" 2019-02-02 06:01:12 +00:00
CODE_OWNERS.TXT [llvm-mca] Move llvm-mca library to llvm/lib/MCA. 2018-12-17 08:08:31 +00:00
configure
CREDITS.TXT Remove a period from CREDITS.TXT (testing email change). NFC 2019-01-19 09:07:38 +00:00
LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
llvm.spec.in Update structured references to the license to the new license. 2019-01-19 11:30:51 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
README.txt Test commit. 2018-09-22 01:01:03 +00:00
RELEASE_TESTERS.TXT Update the list of platforms & archs 2018-12-16 14:47:16 +00:00

README.txt 

The LLVM Compiler Infrastructure
================================

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
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LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
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documentation setup.

If you are writing a package for LLVM, see docs/Packaging.rst for our
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