Re: meson incorrectly detects libcurl as present even if it spots that its dependencies are missing

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 4/15/21 2:29 PM, Peter Maydell wrote:
> My build of system-emulation with --enable-static seems to have
> broken at some point since the last time I had cause to run it.

Maybe a side-effect of commit d7dedf428fe tri-state?
("meson: accept either shared or static libraries if --disable-static")

> Looking at the meson-log the cause seems to be that meson enables
> libcurl support even though it has found that libcurl's dependencies
> aren't present as static libs:
> 
> Determining dependency 'libcurl' with pkg-config executable
> '/usr/bin/pkg-config'
> PKG_CONFIG_PATH:
> Called `/usr/bin/pkg-config --modversion libcurl` -> 0
> 7.58.0
> PKG_CONFIG_PATH:
> Called `/usr/bin/pkg-config --cflags libcurl` -> 0
> -I/usr/include/x86_64-linux-gnu
> PKG_CONFIG_PATH:
> Called `/usr/bin/pkg-config libcurl --libs --static` -> 0
> -L/usr/lib/x86_64-linux-gnu -L/usr/lib/x86_64-linux-gnu/mit-krb5
> -lcurl -lnghttp2 -lidn2 -lrtmp -lpsl -lnettle -lgnutls
> -Wl,-Bsymbolic-functions -Wl,-z,relro -lgssapi_krb5 -lkrb5 -lk5crypto
> -lcom_err -llber -lldap -llber -lz
> PKG_CONFIG_PATH:
> Called `/usr/bin/pkg-config libcurl --libs --static` -> 0
> -L/usr/lib/x86_64-linux-gnu/mit-krb5 -lcurl -lnghttp2 -lidn2 -lrtmp
> -lpsl -lnettle -lgnutls -Wl,-Bsymbolic-functions -Wl,-z,relro
> -lgssapi_krb5 -lkrb5 -lk5crypto -lcom_err -llber -lldap -llber -lz
> None of 'PKG_CONFIG_PATH' are defined in the environment, not changing
> global flags.
> WARNING: Static library 'nghttp2' not found for dependency 'libcurl',
> may not be statically linked
> WARNING: Static library 'psl' not found for dependency 'libcurl', may
> not be statically linked
> WARNING: Static library 'gssapi_krb5' not found for dependency
> 'libcurl', may not be statically linked
> WARNING: Static library 'krb5' not found for dependency 'libcurl', may
> not be statically linked
> WARNING: Static library 'k5crypto' not found for dependency 'libcurl',
> may not be statically linked
> Run-time dependency libcurl found: YES 7.58.0
> 
> 
> This seems wrong to me -- if meson is smart enough to spot that
> it's not actually going to be able to statically link libcurl
> because of all those missing static libs, it should determine that
> it has not found a working libcurl, rather than saying that it has
> and letting the build proceed until the final link of executables fails.
> 
> thanks
> -- PMM
>