Commit Graph

6 Commits

Author SHA1 Message Date
Nico Weber 75196b99fb [llvm-lib] Add /WX, warn by default on empty inputs, add opt-out
lib.exe by default exits successfully without writing an output
file when no inputs are passed. llvm-lib has the same behavior,
for compatibility.

This behavior interacts poorly with build systems: If a static
library target had no inputs, llvm-lib would not produce an output
file, causing ninja (or make, or a similar system) to successfully
run that step, but then re-run it on the next build.

After this patch, llvm-lib emits a warning in this case, that with
/WX can be turned into an error. That way, ninja (or make, or...)
will mark the initial build as failed.

People who don't like the warning can use /ignore:emptyoutput to
suppress it.

The warning also points out the existing flag /llvmlibempty which
forces creation of an empty .lib file (this is an extension to lib.exe).

Differential Revision: https://reviews.llvm.org/D123517
2022-04-11 13:15:30 -04:00
Eric Astor e9827f0b82 [ms] Add new option to llvm-lib: /llvmlibempty
Summary:
Add a new option (/llvmlibempty). If passed and llvm-lib does not give an error, it will create a valid output archive even if empty.

By default, llvm-lib mimicks lib.exe: if given no input files, it doesn't create its output file at all. This is incompatible with some build systems, so we add a command-line option to toggle this compatibility behavior.

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D78894
2020-04-30 15:30:56 -04:00
Nico Weber b941fa8821 llvm-lib: Implement /machine: argument
And share some code with lld-link.

While here, also add a FIXME about PR42180 and merge r360150 to llvm-lib.

Differential Revision: https://reviews.llvm.org/D63021

llvm-svn: 363016
2019-06-11 01:13:41 +00:00
Nico Weber a2f60933e5 llvm-lib: Implement /list flag
Differential Revision: https://reviews.llvm.org/D57952

llvm-svn: 353620
2019-02-09 17:33:04 +00:00
Nico Weber 17172c6b80 Give llvm-lib rudimentary help output.
https://reviews.llvm.org/D49318

llvm-svn: 337084
2018-07-14 02:29:44 +00:00
Peter Collingbourne c6f07c423d Move lib/LibDriver -> lib/ToolDrivers/llvm-lib. NFCI.
This reorganisation prevents us from cluttering up the top-level lib directory
with more driver libraries such as llvm-dlltool (see D29892).

llvm-svn: 302995
2017-05-13 22:06:46 +00:00