[llvm-bugs] [Bug 46571] New: POWER8 and "error: unknown type name 'inline'" when using -std=c89

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46571

            Bug ID: 46571
           Summary: POWER8 and "error: unknown type name 'inline'" when
                    using -std=c89
           Product: clang
           Version: 8.0
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: noloader at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

I'm working with a project that wishes to use -std=c89 -pedantic for
testing.[1]

Compiling a POWER8 source file that uses vector built-ins [2], such as vec_ld,
results in the following. It looks like Clang disagrees with 'inline' from
<altivec.h>.

I don't have a reproducer at the moment. The only POWER8 machine I have access
to with Clang 8.0 is at Travis. The GCC compile farm has old versions of Clang,
and I am getting different compile errors.

>From [2]:

clang-8 blake2sp.c blake2s.c -o blake2sp -O3 -I../testvectors -Wall -Wextra
-std=c89 -pedantic -Wno-long-long -mcpu=power8 -DBLAKE2SP_SELFTEST

In file included from blake2b.c:21:

In file included from ./blake2-impl.h:35:

/usr/lib/llvm-8/lib/clang/8.0.0/include/altivec.h:16173:8: error: unknown type
name 'inline'

static inline __ATTRS_o_ai vector bool char vec_reve(vector bool char __a) {

       ^

/usr/lib/llvm-8/lib/clang/8.0.0/include/altivec.h:16173:15: error: expected
identifier or '('

static inline __ATTRS_o_ai vector bool char vec_reve(vector bool char __a) {

              ^

/usr/lib/llvm-8/lib/clang/8.0.0/include/altivec.h:56:22: note: expanded from
macro '__ATTRS_o_ai'

#define __ATTRS_o_ai __attribute__((__overloadable__, __always_inline__))

                     ^
...


[1] https://travis-ci.org/github/noloader/BLAKE2/jobs/704535813
[2] https://github.com/BLAKE2/BLAKE2/blob/master/power8/blake2b.c

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