If there are no .o/.a files to be distributed, this prevents
check_convert_bitcode from being called without a file argument,
in which case the first flag is going to be treated like the file
name, resulting in something like:
realpath: invalid option -- 'O'
Try 'realpath --help' for more information.
Usage: file [-bcCdEhikLlNnprsSvzZ0] [--apple] [--extension] [--mime-encoding]
[--mime-type] [-e <testname>] [-F <separator>] [-f <namefile>]
[-m <magicfiles>] [-P <parameter=value>] [--exclude-quiet]
<file> ...
file -C [-m <magicfiles>]
file [--help]
The brp-llvm-compile-lto-elf script uses PCRE in grep to match
for the -flto flag in bitcode object dumps, using negative
lookahead to exclude the case where -fno-lto is specified after.
When lines in the bitcode dump exceed the length that PCRE can
match against, grep will error out causing brp-llvm-compile-lto-elf
to fail.
This script implements an equivalent regex match in python to avoid
the limit in PCRE grep.
Resolves: rhbz#2017193
