https://sourceware.org/bugzilla/show_bug.cgi?id=31200
Bug ID: 31200
Summary: Surprising behavior of DISCARD section and explicitly
mentioned archive file
Product: binutils
Version: 2.38
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: petedietl at gmail dot com
Target Milestone: ---
Created attachment 15274
--> https://sourceware.org/bugzilla/attachment.cgi?id=15274&action=edit
minimal reproduction of problem
I am observing that the sections of an archive file explicitly mentioned in an
input section of a linker script within the /DISCARD/ output section does not
get discarded if the -T option on an ld invocation is given after mentioning a
.o file that has an undefined symbol which is found in a section of an object
file within said archive. It was not clear to me in the documentation what the
expected behavior is. Attached is a Makefile and sources reproduction on an
x86_64 Ubuntu machine.
When I run `make`, I get an error like so: undefined reference to
`libfoo_getmsg'/
When I run `make clean && make SCRIPT_LAST=1`, it works.
It seems that indeed the position of the linker script is a key factor.
Furthermore, if one changes the linker script from `libfoo.a (*)` to `foo.o
(*)`, the `make` command succeeds regardless of the position of the linker
script argument.
I suspect that all of this has some complex explanation involving wildcard
matches, but I couldn't figure it out.
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