[OpenWrt-Devel] pkgconf issue with kmods and libelf [Was: Re: tools/pkg-config: Replace with pkgconf]

[Petr Štetiar]

Rosen Penev <rosenp at gmail.com> [2020-02-28 20:12:45]:

Hi,

> It's more portable and smaller. And as stated, it is still fairly active.

Jo has today brought following issue to my attention:

## pkgconf
 $ PATH=$(pwd)/staging_dir/host/bin:$PATH STAGING_PREFIX=$(pwd)/staging_dir/host PKG_CONFIG_PATH=$(pwd)/staging_dir/host/lib/pkgconfig PKG_CONFIG_LIBDIR=$(pwd)/staging_dir/host/lib/pkgconfig pkg-config libelf --libs
 -lelf

## pkg-config

 $ PATH=$(pwd)/staging_dir/host/bin:$PATH STAGING_PREFIX=$(pwd)/staging_dir/host PKG_CONFIG_PATH=$(pwd)/staging_dir/host/lib/pkgconfig PKG_CONFIG_LIBDIR=$(pwd)/staging_dir/host/lib/pkgconfig pkg-config libelf --libs
 -L/home/jow/devel/lede/staging.git/staging_dir/host/lib -lelf

So it looks like pkgconf is filtering out some library paths, causing for
example following issues:

 make[5]: *** No rule to make target 'tools/objtool/objtool', needed by '/home/jow/devel/lede/staging.git/build_dir/target-x86_64_musl/linux-x86_64/siit-1.2/siit.o'.  Stop.

< jow> the main kernel build will skip building objtool (and forcibly disable CONFIG_STACK_VALIDATION) because it cannot link libelf
< jow> any external kmod will assume CONFIG_STACK_VALIDATION is enabled and kbuild will try to invoke objtool which doesn't exist in the precompiled kernel soure tree

Possibly caused by:

 ## linker flags optimization

 As previously mentioned, pkgconf makes optimizations to the linker flags in
 both the case of static and shared linking in order to avoid overlinking
 binaries and also simplifies the `CFLAGS` and `LIBS` output of the pkgconf
 tool for improved readability.

Ref: https://github.com/openwrt/openwrt/pull/2832

-- ynezz

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