[FS#1091] libiconv-full undefined reference compile-time linking error for x86/_64 using GCC7 Musl

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Jake Staehle (staehle) 

Attached to Project - LEDE Project
Summary - libiconv-full undefined reference compile-time linking error for x86/_64 using GCC7 Musl
Task Type - Build Failure
Category - Packages
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - LEDE Trunk using latest commit fbde9ac718409720a937671f3354837223b5db76
Feeds all using latest trunk sources, though that shouldn't affect this
Target is "x86" Generic (also tried x86_64)
Selected GCC 7 for compiler options
.config is attached

Problem discovered when enabling the 'minidlna' package, which has a dependency on 'libiconv-full' - a core LEDE package.

Compilation fails on 'libiconv-full' with undefined reference errors (linking errors) for objects 'aliases_lookup' and 'aliases2_lookup' in "libiconv.so":

make[5]: Entering directory '/home/jstaehle/prem2/depot/lede/build_dir/target-i386_pentium4_musl/libiconv-1.11.1/src'
/bin/sh ../libtool --mode=link i486-openwrt-linux-musl-gcc -L/home/jstaehle/prem2/depot/lede/staging_dir/target-i386_pentium4_musl/usr/lib -L/home/jstaehle/prem2/depot/lede/staging_dir/target-i386_pentium4_musl/lib -L/home/jstaehle/prem2/depot/lede/staging_dir/toolchain-i386_pentium4_gcc-7.2.0_musl/usr/lib -L/home/jstaehle/prem2/depot/lede/staging_dir/toolchain-i386_pentium4_gcc-7.2.0_musl/lib -znow -zrelro  iconv_no_i18n.o ../srclib/libicrt.a ../lib/libiconv.la -o iconv_no_i18n
i486-openwrt-linux-musl-gcc -znow -zrelro iconv_no_i18n.o -o iconv_no_i18n  -L/home/jstaehle/prem2/depot/lede/staging_dir/target-i386_pentium4_musl/usr/lib -L/home/jstaehle/prem2/depot/lede/staging_dir/target-i386_pentium4_musl/lib -L/home/jstaehle/prem2/depot/lede/staging_dir/toolchain-i386_pentium4_gcc-7.2.0_musl/usr/lib -L/home/jstaehle/prem2/depot/lede/staging_dir/toolchain-i386_pentium4_gcc-7.2.0_musl/lib ../srclib/libicrt.a ../lib/.libs/libiconv.so -Wl,--rpath -Wl,/home/jstaehle/prem2/depot/lede/build_dir/target-i386_pentium4_musl/libiconv-1.11.1/lib/.libs
../lib/.libs/libiconv.so: undefined reference to `aliases_lookup'
../lib/.libs/libiconv.so: undefined reference to `aliases2_lookup'
collect2: error: ld returned 1 exit status
Makefile:64: recipe for target 'iconv_no_i18n' failed
make[5]: *** [iconv_no_i18n] Error 1

Full build log is also attached

Tested with a full default configuration and only options enabled being GCC 7 and a modular option for the libiconv-full package, so that should rule out any external influence. 

I did find one other reference to this issue on the LEDE forums a few months ago here: [[https://forum.lede-project.org/t/compilation-fails-on-libiconv-full/4504|LEDE Forums: compilation fails on libiconv-full]]


One or more files have been attached.

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=1091