https://sourceware.org/bugzilla/show_bug.cgi?id=27210
Bug ID: 27210
Summary: ld: Don't suppress foo if foo@v1 is defined
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: i at maskray dot me
Target Milestone: ---
cat > a.s <<eof
.globl foo
.symver foo, foo@v1
foo: nop
eof
echo 'v1 {};' > a.ver
cat > b.s <<eof
.globl foo_v1
foo_v1: nop
.symver foo_v1, foo@v1
eof
exit
GNU ld has a special rule removing foo if foo@v1 is defined. gold and LLD don't
have the special rule.
I think the gold/LLD behavior makes more sense.
Building glibc does not need the GNU ld special rule. The 30000+ FreeBSD ports
work with the LLD behavior.
People know that non-default versions should use a different original symbol
name.
So dropping the special rule is likely safe.
% gcc -shared -fuse-ld=bfd a.s -nostdlib -Wl,--version-script=a.ver -o a.bfd.so
&& readelf -W --dyn- a.bfd.so
Symbol table '.dynsym' contains 4 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000001000 0 NOTYPE GLOBAL DEFAULT 7 foo@v1
2: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS v1
3: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS v2
% gcc -shared -fuse-ld=gold a.s -nostdlib -Wl,--version-script=a.ver -o
a.gold.so && readelf -W --dyn- a.gold.so
Symbol table '.dynsym' contains 8 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000002000 0 NOTYPE GLOBAL DEFAULT 8 _end
2: 0000000000002000 0 NOTYPE GLOBAL DEFAULT 8 _edata
3: 000000000000034c 0 NOTYPE GLOBAL DEFAULT 7 foo@v1
4: 000000000000034c 0 NOTYPE GLOBAL DEFAULT 7 foo
5: 0000000000002000 0 NOTYPE GLOBAL DEFAULT 8 __bss_start
6: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS v1
7: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS v2
For b.s, both foo_v1 and foo@v1 are present.
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