llvm/llvm-project

[clang] --entry command line option is broken

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#68,355 opened on Oct 5, 2023

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clang:drivergood first issue

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Description

Optoion '--entry' ('--entry=') should be forwarded to linker the same way as its aliasee '-e' is forwarded. Currently, it complains about unsupported option.

clang test.c --entry=my_start
clang: error: unsupported option '--entry=my_start'

Apparently, the option is declared as a flag, i.e. clang accepts this, but linker non-surprisingly fails:

clang test.c --entry
/usr/bin/ld: warning: cannot find entry symbol --library=gcc; defaulting to 0000000000001040

Reference: https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html#index-e

Contributor guide

Research direction
Inspect the clang driver option table to find the definition of ' entry'. It should be an alias for ' e' and must be handled as a value taking option, not a flag. Trace how ' e' is forwarded to the linker and ensure ' entry' follows the same path.
Tech stack
cpp
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++compiler driver concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
55