can fix no version information available when build libcurl use cmake???

[xiedeacc]

I did this

I know we can use ./configure --enable-versioned-symbols l, but how to enable versioned symbols use cmake? can guys fix this?

I expected the following

No response

curl/libcurl version

curl 8.10.0-DEV (x86_64-pc-linux-gnu) libcurl/8.10.0-DEV OpenSSL/3.3.1 zlib/1.3.1.1-motley brotli/1.1.0 zstd/1.5.6
Release-Date: [unreleased]
Protocols: dict file ftp ftps gopher gophers http https imap imaps ipfs ipns mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet tftp
Features: alt-svc AsynchDNS brotli HSTS HTTPS-proxy IPv6 Largefile libz NTLM SSL threadsafe TLS-SRP UnixSockets zstd

operating system

ubuntu22.04

[vszakats]

That's the commit implementing this feature for autotools, in case anyone is wondering what's it about:
7cc2e8b

It's ld/lld-specific and on a quick glance can be enabled with CMake by passing a custom linker option (via -DCMAKE_SHARED_LINKER_FLAGS=) with a custom control file.

The "version symbol flavour" value auto-generated by autotools looks somewhat accidental: no MultiSSL support, nor considering any other option besides TLS backend.

https://www.gnu.org/software/gnulib/manual/html_node/LD-Version-Scripts.html
https://www.akkadia.org/drepper/dsohowto.pdf

[xiedeacc]

That's the commit implementing this feature for autotools, in case anyone is wondering what's it about: 7cc2e8b

It's ld/ldd-specific and on a quick glance can be enabled with CMake by passing a custom linker option (via -DCMAKE_SHARED_LINKER_FLAGS=) with a custom control file.

The "version symbol flavour" value auto-generated by autotools looks somewhat accidental: no MultiSSL support, nor considering any other option besides TLS backend.

👍

[bagder]

The "version symbol flavour" value auto-generated by autotools looks somewhat accidental: no MultiSSL support, nor considering any other option besides TLS backend.

It was added years before MultiSSL was and I assume not a lot of people have bothered, understood nor given this much attention.

[vszakats]

Couple of observations / questions:

• Actually it has been updated for MultiSSL, getting the "flavour" string MULTISSL_. Thinking of a CMake implementation, perhaps a custom string would make better sense?
• The _rest*, _save* (and __*?) function name masks in lib/libcurl.vers.in: What may be their purpose? There aren't such symbols in curl now, and weren't at the time of the commit. (Deleting these lines didn't change the output in my tests.)
• How is this option supposed to interact with --enable-symbol-hiding/--disable-symbol-hiding?
• Apple ld doesn't support this, neither does llvm's lld for macOS.
• Current soversion (4) is just hard-coded into lib/libcurl.vers.in.