"Redefinition of a extern inline not supported in C99" build failure(s) — clang 3.4

clang refuses this code while gcc accepts it:
// foo.c:5:6: error: redefinition of a 'extern inline' function 'foo' is not
//      supported in C99 mode
extern inline void foo ()
{
}

void foo ()
{
}
PackageVersionSupposed error messageFull log Bug report
adun.app 0.81-6AdLinkedList.c:53:5: error: redefinition of a 'extern inline' function 'AdUnsafeLinkedListAdd' is not supported in C99 mode Log
atftp 0.7.git20120829-1argz.c:44:8: error: redefinition of a 'extern inline' function 'argz_next' is not supported in C99 mode Log
fhist 1.18-1common/input.c:34:1: error: redefinition of a 'extern inline' function 'input_name' is not supported in C99 mode Log
glusterfs 3.4.2-1argp-fmtstream.c:395:1: error: redefinition of a 'extern inline' function 'argp_fmtstream_write' is not supported in C99 mode Log
hfsplus 1.0.4-12blockiter.c:148:8: error: redefinition of a 'extern inline' function 'blockiter_curr' is not supported in C99 mode Log
libmoe 1.5.8-1iso2mb.c:517:1: error: redefinition of a 'extern inline' function 'mb_encode_to_wchar' is not supported in C99 mode Log
lsh-utils 2.1-1argp-fmtstream.c:422:1: error: redefinition of a 'extern inline' function 'argp_fmtstream_putc' is not supported in C99 mode Log
mtd-utils 1:1.5.0-1mkfs.ubifs/hashtable/hashtable_itr.c:42:1: error: redefinition of a 'extern inline' function 'hashtable_iterator_key' is not supported in C99 mode Log
unionfs-fuse 0.24-2.2hashtable_itr.c:42:1: error: redefinition of a 'extern inline' function 'hashtable_iterator_key' is not supported in C99 mode Log

9 errors