CODEWITHSUNDEEP
cgcclinkerstatic-librariesld
user2328113
user2328113

Reputation: 143

GNU ld: weak declaration overriding strong declaration

I am writing a bare metal application and am running into an issue that I believe is related to the linker.

Issue:

IRQ handler is not being linked from the static library provided. The IRQ is declared outside of the library with __attribute__ ((weak, alias("defaultInterrupt"))). When this attribute is provided, the IRQ is not linked. When the attribute is removed, the IRQ is linked.

This post: Linking with static library not equivalent to linking with its objects indicates that the issue may be with the linker not finding the strong declaration because it stops searching, but does not suggest a fix.

Question:

Is there any way to ensure that the linker will find the strongly declared function?

Environment:

I am using arm-none-eabi-ld distributed by ARM, found here: arm-none-eabi

Already Attempted:

Re-ordering the libraries passed to the linker

Upvotes: 4

Views: 1250

Answers (1)

2bluesc
2bluesc

Reputation: 393

It appears that a similar question was asked quite some time ago in a galaxy not at all far away: Override weak symbols in static library

tl;dr; The take away is that the weak attribute doesn't apply as one would expect in static archive libraries. The linker stops searching at the first encounter of the target symbol name. The author of the accepted answer explains that weak may only make sense for shared objects.

Upvotes: 1

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