On 8/7/20 5:57 AM, Petr Pisar wrote:
> I think the build script does not use Perl configuration consistently. It uses
> ldflags value for the linker flags, but it does not use ld value for the
> linker
> exectable:
...
> $ perl -MConfig -E 'say $Config{ldflags}'
> -Wl,-z,relro -Wl,--as-needed -Wl,-z,now
> -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -fstack-protector-strong
> -L/usr/local/lib
> $ perl -MConfig -E 'say $Config{ld}'
> gcc
double-checking here,
perl -MConfig -E 'say $Config{ldflags}'
-Wl,-z,relro -Wl,--as-needed -Wl,-z,now
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld -fstack-protector-strong
-L/usr/local/lib
perl -MConfig -E 'say $Config{ld}'
gcc
> If your /usr/bin/ld is the binutils ld,
it is:
which ld
/usr/bin/ld
ld -v
GNU ld version 2.34-4.fc32
rpm -ql binutils | grep bin/ld
/usr/bin/ld
/usr/bin/ld.bfd
ls -al /usr/bin/ld
lrwxrwxrwx. 1 root root 20 Jul 28 21:59 /usr/bin/ld ->
/etc/alternatives/ld*
ls -al /etc/alternatives/ld
lrwxrwxrwx. 1 root root 15 Jul 28 21:59 /etc/alternatives/ld ->
/usr/bin/ld.bfd*
>
then -fstack-protector-strong is also
> an invalid option for ld (see ld manual page) and it should also fail. I think
> something tricks you.
noted
> It's not intentional, but it's how perl works.
>
> When you build perl, the linker flags are modified by a perl build script and
> built into the perl interpreter. Later when a third-party XS module is built,
> the built-in linker flags are reused. That's because the XS module must be
> binary compatible with the perl interpreter and having the same flags ensures
> it. (Some flags, especially compiler flags, changes ABI.) As a result, the
> third-party module is also built rerlo.
>
> We would like to change it, but perl build script is a giant mess. When I
> asked
> perl authors for explaining the mess, it turned out that they do not fully
> understand it and, more imporatantly, that they do not want to touch it
> all because they fear breaking a compatibility.
>
>> Or likely an issue with the module not correctly dealing with it?
>
> I think that's the case. It should use gcc program for linking.
thx for the comments! I'll share upstream.
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