[Buildroot] [Bug 15181] Building libcurl fails due to faulty package definition

[bugzilla@busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=15181

--- Comment #2 from Jookia <contact@jookia.org> ---
My friend Xogium hit this issue this month and after a few debugging sessions
we tracked this down. Here's what I've found:

- Arch Linux's host toolchain now sets runpath instead of rpath
- libcurl sets LD_LIBRARY_PATH to /lib:/usr/lib
- Buildroot pkgconf and Arch Linux pkgconf versions line up
- Arch Linux pkgconf library is installed to /usr/lib/libpkgconf.so
- Buildroot pkgconf uses the host libpkgconf.so due to LD_LIBRARY_PATH
- this is respected because rpath does not override it
- The Buildroot pkg-conf script sets LIBPATH to build/host/bin/../sysroot/...
and SYSROOT to build/host/sysroot
- pkgconf 1.8 silently ignores LIBPATH if it's outside sysroot
- pkgconf 1.8 does not normalize paths
- pkgconf reverted LIBPATH to the one in the host's libpkg.so, /lib and
/usr/lib
- curl build tries to find openssl but can't

Two fixes are needed:

- libcurl build should not set LD_LIBRARY_PATH
- the pkg-config wrapper should use normalized paths

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