[Bug gas/25264] RISC-V option norvc: linker complains "14 bytes required for alignment to 16-byte boundary, but only 12 present"

[wilson at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=25264

Jim Wilson <wilson at gcc dot gnu.org> changed:

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                 CC|                            |wilson at gcc dot gnu.org

--- Comment #1 from Jim Wilson <wilson at gcc dot gnu.org> ---
This is a known problem.  There is a proposal to the psABI to add new
relocations to help fix it, but there is no timetable for a fix.

One workaround is to make sure that you align before disabling rvc mode.  It
you do
  .option norvc
  .balign 16
add you need a 2-byte nop, then you have a problem, because we can't emit a
2-byte nop in norvc mode.  So you must instead do
  .balign 16
  .option norvc
so that the 2-byte nop gets emitted before we switch to norvc mode.

With the current set of relocations, there is no way for the linker to know if
this is a user error or a toolchain error when we see an alignment problem, so
you get a not very useful generic error.

There was also a suggestion to make option norvc/rvc imply the necessary align
operation itself, before changing the mode, but I'm not sure if that is a good
idea or not.

I think there might already be a bug report for this, but I'm too busy to look
it up at the moment.

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