https://sourceware.org/bugzilla/show_bug.cgi?id=27493
Bug ID: 27493
Summary: objcopy --weaken-symbol does not weaken undefined
symbols
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: i at maskray dot me
Target Milestone: ---
% cat a.s
.globl def
def:
call undef
% cc -c a.s
% objcopy --weaken-symbol=def --weaken-symbol=undef a.o b.o
% readelf -Ws b.o
Symbol table '.symtab' contains 7 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000000 0 SECTION LOCAL DEFAULT 1
2: 0000000000000000 0 SECTION LOCAL DEFAULT 3
3: 0000000000000000 0 SECTION LOCAL DEFAULT 4
4: 0000000000000000 0 SECTION LOCAL DEFAULT 5
5: 0000000000000000 0 NOTYPE WEAK DEFAULT 1 def
6: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND undef
--weaken-symbol applies on a defined symbol but not on an undefined symbol.
This was originally raised as a behavior difference between objcopy and
llvm-objcopy https://bugs.llvm.org/show_bug.cgi?id=49362 .
My feeling is that weakening undefined symbols matches the documentation and
should be done. It is a behavior change but it unlikely causes any trouble.
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