llvm-project

Commit Graph

Author	SHA1	Message	Date
Nico Weber	20eb719f99	lld: Reduce number of references to undefined printed from 10 to 3. As of a while ago, lld groups all undefined references to a single symbol in a single diagnostic. Back then, I made it so that we print up to 10 references to each undefined symbol. Having used this for a while, I never wished there were more references, but I sometimes found that this can print a lot of output. lld prints up to 10 diagnostics by default, and if each has 10 references (which I've seen in practice), and each undefined symbol produces 2 (possibly very long) lines of output, that's over 200 lines of error output. Let's try it with just 3 references for a while and see how that feels in practice. Differential Revision: https://reviews.llvm.org/D77017	2020-03-30 14:31:32 -04:00
Nico Weber	2c45043415	lld/elf: Deduplicate undefined symbol diagnostics Before: ``` ld.lld: error: undefined symbol: f() >>> referenced by test.cc:3 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-9c0808.o:(g()) ld.lld: error: undefined symbol: f() >>> referenced by test.cc:4 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-9c0808.o:(h()) ld.lld: error: undefined symbol: f() >>> referenced by test.cc:5 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-9c0808.o:(j()) ld.lld: error: undefined symbol: k() >>> referenced by test.cc:5 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-9c0808.o:(j()) ld.lld: error: undefined symbol: f() >>> referenced by test2.cc:2 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test2-07b391.o:(asdf()) clang: error: linker command failed with exit code 1 (use -v to see invocation) ``` Now: ``` ld.lld: error: undefined symbol: f() >>> referenced by test.cc:3 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-0e07ba.o:(g()) >>> referenced by test.cc:4 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-0e07ba.o:(h()) >>> referenced by test.cc:5 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-0e07ba.o:(j()) >>> referenced by test2.cc:2 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test2-6bdb24.o:(asdf()) ld.lld: error: undefined symbol: k() >>> referenced by test.cc:5 >>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-0e07ba.o:(j()) clang: error: linker command failed with exit code 1 (use -v to see invocation) ``` If there are more than 10 references to an undefined symbol, only the first 10 are printed. Fixes PR42260. Differential Revision: https://reviews.llvm.org/D63344 llvm-svn: 363962	2019-06-20 18:25:57 +00:00

Author

SHA1

Message

Date

Nico Weber

20eb719f99

lld: Reduce number of references to undefined printed from 10 to 3.

As of a while ago, lld groups all undefined references to a single
symbol in a single diagnostic. Back then, I made it so that we
print up to 10 references to each undefined symbol.

Having used this for a while, I never wished there were more
references, but I sometimes found that this can print a lot of
output. lld prints up to 10 diagnostics by default, and if
each has 10 references (which I've seen in practice), and each
undefined symbol produces 2 (possibly very long) lines of output,
that's over 200 lines of error output.

Let's try it with just 3 references for a while and see how
that feels in practice.

Differential Revision: https://reviews.llvm.org/D77017

2020-03-30 14:31:32 -04:00

Nico Weber

2c45043415

lld/elf: Deduplicate undefined symbol diagnostics

Before:

```
ld.lld: error: undefined symbol: f()
>>> referenced by test.cc:3
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-9c0808.o:(g())

ld.lld: error: undefined symbol: f()
>>> referenced by test.cc:4
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-9c0808.o:(h())

ld.lld: error: undefined symbol: f()
>>> referenced by test.cc:5
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-9c0808.o:(j())

ld.lld: error: undefined symbol: k()
>>> referenced by test.cc:5
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-9c0808.o:(j())

ld.lld: error: undefined symbol: f()
>>> referenced by test2.cc:2
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test2-07b391.o:(asdf())
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```

Now:

```
ld.lld: error: undefined symbol: f()
>>> referenced by test.cc:3
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-0e07ba.o:(g())
>>> referenced by test.cc:4
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-0e07ba.o:(h())
>>> referenced by test.cc:5
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-0e07ba.o:(j())
>>> referenced by test2.cc:2
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test2-6bdb24.o:(asdf())

ld.lld: error: undefined symbol: k()
>>> referenced by test.cc:5
>>>               /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-0e07ba.o:(j())
clang: error: linker command failed with exit code 1 (use -v to see invocation)
```

If there are more than 10 references to an undefined symbol, only the
first 10 are printed.

Fixes PR42260.

Differential Revision: https://reviews.llvm.org/D63344

llvm-svn: 363962

2019-06-20 18:25:57 +00:00

2 Commits