[FS#483] buildbot: lots of packages fail on several platforms due to "C compiler cannot create executables"

[LEDE Bugs]

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

User who did this - Hannu Nyman (hnyman) 

Attached to Project - LEDE Project
Summary - buildbot: lots of packages fail on several platforms due to "C compiler cannot create executables"
Task Type - Bug Report
Category - Other
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - High
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - Recently, 1-2 seeks ago, buildbot seems to fail to compile lots of packages due to configure error for missing C compiler, or if they are not using configure, for a missing compiler:

Example:
ccrypt in mips24kc, no changes for ages.

http://downloads.lede-project.org/snapshots/faillogs/mips_24kc/packages/ccrypt/compile.txt

checking for mips-openwrt-linux-gcc... ccache_cc
checking whether the C compiler works... no
configure: error: in `/data/bowl-builder/mips_24kc/build/sdk/build_dir/target-mips_24kc_musl/ccrypt-1.10':
configure: error: C compiler cannot create executables


http://downloads.lede-project.org/snapshots/faillogs/mips_24kc/packages/vsftpd/tls/compile.txt

ccache: error: Could not find compiler "mips-openwrt-linux-musl-gcc" in PATH


Based on those, this might also be ccache-related.

The list of downloadable packages (from packages feed) contains practically only non-C packages (i.e. pure scripts, perl-based, python-based etc.)
http://downloads.lede-project.org/snapshots/packages/mips_24kc/packages/

But the faillogs dir is quite full:
http://downloads.lede-project.org/snapshots/faillogs/mips_24kc/packages/


More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=483