Description
Proposal
On macOS and Windows -Csplit-debuginfo=packed puts all debuginfo in a separate file. This avoids leaking sensitive information into release executables while still allowing debugging with those debuginfo files and reduces file size. On Linux however we make use of dwarf split debuginfo, which puts a fair amount of information into the executable itself, leaking sensitive data like build paths, and increases the size of executables. Instead I propose to add an option to use debug fission where the debuginfo sections are copied out of the executable into a separate file and buildid is used to be able to locate the right debuginfo file. This is what all major linux distros use for debuginfo. This disadvantage over the current scheme is longer linking time, but for local development -Csplit-debuginfo=unpacked is a better choice anyway, which I propose to keep using dwarf split debuginfo as is. This way -Csplit-debuginfo=unpacked is the best choice for local development and the new -Csplit-debuginfo=post-link is the best choice for release builds across all platforms that support the respective options. -Csplit-debuginfo=post-link would be equivalent to -Csplit-debuginfo=packed on Windows and macOS.
Mentors or Reviewers
Process
The main points of the Major Change Process are as follows:
- File an issue describing the proposal.
- A compiler team member or contributor who is knowledgeable in the area can second by writing
@rustbot second.- Finding a "second" suffices for internal changes. If however, you are proposing a new public-facing feature, such as a
-C flag, then full team check-off is required. - Compiler team members can initiate a check-off via
@rfcbot fcp mergeon either the MCP or the PR.
- Finding a "second" suffices for internal changes. If however, you are proposing a new public-facing feature, such as a
- Once an MCP is seconded, the Final Comment Period begins. If no objections are raised after 10 days, the MCP is considered approved.
You can read more about Major Change Proposals on forge.
Comments
This issue is not meant to be used for technical discussion. There is a Zulip stream for that. Use this issue to leave procedural comments, such as volunteering to review, indicating that you second the proposal (or third, etc), or raising a concern that you would like to be addressed.