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lib: disable xref ELF note on mips64el

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mips64el does not have a 64-bit PC-relative relocation, which is needed
to emit the ELF note for xrefs.  Disabling the ELF note means clippy
takes the fallback path using section headers, so everything does still
work (... unless you strip the section headers.)

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2023-01-06 16:59:55 +01:00
parent ccac11096c
commit ee4a6b9f65
1 changed files with 12 additions and 1 deletions
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13
lib/xref.h
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@ -208,8 +208,19 @@ extern const struct xref * const __stop_xref_array[1] DSO_LOCAL;
* some build issue with it just add -DFRR_XREF_NO_NOTE to your build flags
* to disable it.
*/
#ifdef FRR_XREF_NO_NOTE
#if defined(FRR_XREF_NO_NOTE) || defined(__mips64)
#define XREF_NOTE ""
/* mips64 note: MIPS64 (regardless of endianness, both mips64 & mips64el)
* does not have a 64-bit PC-relative relocation type. Unfortunately, a
* 64-bit PC-relative relocation is exactly what the below asm magic emits.
* Therefore, the xref ELF note is permanently disabled on MIPS64.
*
* For some context, refer to https://reviews.llvm.org/D80390
*
* As noted above, xref extraction still works through the section header
* path, so no functionality is lost.
*/
#else
#if __SIZEOF_POINTER__ == 4