llvm/lld/test/wasm/threads.s
Fangrui Song eb4663d8c6 [lld][COFF][ELF][WebAssembly] Replace --[no-]threads /threads[:no] with --threads={1,2,...} /threads:{1,2,...}
--no-threads is a name copied from gold.
gold has --no-thread, --thread-count and several other --thread-count-*.

There are needs to customize the number of threads (running several lld
processes concurrently or customizing the number of LTO threads).
Having a single --threads=N is a straightforward replacement of gold's
--no-threads + --thread-count.

--no-threads is used rarely. So just delete --no-threads instead of
keeping it for compatibility for a while.

If --threads= is specified (ELF,wasm; COFF /threads: is similar),
--thinlto-jobs= defaults to --threads=,
otherwise all available hardware threads are used.

There is currently no way to override a --threads={1,2,...}. It is still
a debate whether we should use --threads=all.

Reviewed By: rnk, aganea

Differential Revision: https://reviews.llvm.org/D76885
2020-03-31 08:46:12 -07:00

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ArmAsm

# RUN: llvm-mc -filetype=obj -triple=wasm32 %s -o %t.o
## A positive integer is allowed.
# RUN: wasm-ld --no-entry %t.o -o /dev/null
# RUN: wasm-ld --no-entry --threads=1 %t.o -o /dev/null
# RUN: wasm-ld --no-entry --threads=2 %t.o -o /dev/null
# RUN: not wasm-ld --threads=all %t.o -o /dev/null 2>&1 | FileCheck %s -DN=all
# RUN: not wasm-ld --threads=0 %t.o -o /dev/null 2>&1 | FileCheck %s -DN=0
# RUN: not wasm-ld --threads=-1 %t.o -o /dev/null 2>&1 | FileCheck %s -DN=-1
# CHECK: error: --threads: expected a positive integer, but got '[[N]]'