codegen/build.rs: disable print_system_libs in calls to pkg-config #553
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By default, pkg-config-rs sets the PKG_CONFIG_ALLOW_SYSTEM_LIBS environment variable (rust-lang/pkg-config-rs#35), which leads to eg /usr/lib being present in the middle of the final command, in turn leading to issues when working in an uninstalled environment, where libraries that are also present system-wide do not get linked against.
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By default, pkg-config-rs sets the PKG_CONFIG_ALLOW_SYSTEM_LIBS
environment variable
(rust-lang/pkg-config-rs#35), which leads
to eg /usr/lib being present in the middle of the final command,
in turn leading to issues when working in an uninstalled environment,
where libraries that are also present system-wide do not get linked
against.