V2 [PATCH] PKG_CHECK_MODULES: Check if $pkg_cv_[]$1[]_LIBS works

[Simon Marchi]

On 2020-07-28 12:07 p.m., H.J. Lu via Gdb-patches wrote:
> What doesn't work with my pkg.m4 change?

(1) It deviates from upstream.  I don't think we should do this unless
    absolutely needed.  That's not the case here, the change is just there
    because you don't want to set up pkg-config properly for cross-compiling.

(2) I don't think it's necessarily bad to try to do a link to confirm the lib
    is indeed there, but as I said earlier I don't think that doing as if the
    package was not there is the right response.  This can happen if you have
    a mis-configured pkg-config (like you have) or a broken installation (for
    example, the .pc is there but the lib is not).  In either case, there's
    something wrong with the build environment and I think it's more useful
    to abort and tell the user rather than silently failing.

Point 2 should be discussed upstream anyway, there's no point making a decision
local to binutils-gdb.

Simon