[llvm-bugs] [Bug 46572] New: NEON and "error: unknown type name 'inline'" when using -std=c89

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46572

            Bug ID: 46572
           Summary: NEON and "error: unknown type name 'inline'" when
                    using -std=c89
           Product: clang
           Version: 7.0
          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 NEON source file on Aarch64 that uses vector built-ins [2], such as
vabdq_u8, results in the following. It looks like Clang disagrees with 'inline'
from <arm_neon.h>.

>From [1]:

clang blake2s.c -o blake2s -march=armv8-a -O3 -I../testvectors -Wall -Wextra
-std=c89 -pedantic -Wno-long-long -DBLAKE2S_SELFTEST

In file included from blake2s.c:19:

/usr/lib/llvm-6.0/lib/clang/6.0.0/include/arm_neon.h:433:1: error: unknown type
name 'inline'

__ai uint8x16_t vabdq_u8(uint8x16_t __p0, uint8x16_t __p1) {

^

/usr/lib/llvm-6.0/lib/clang/6.0.0/include/arm_neon.h:430:21: note: expanded
from macro '__ai'

#define __ai static inline __attribute__((__always_inline__, __nodebug__))

                    ^

/usr/lib/llvm-6.0/lib/clang/6.0.0/include/arm_neon.h:433:1: error: expected
identifier or '('

/usr/lib/llvm-6.0/lib/clang/6.0.0/include/arm_neon.h:430:28: note: expanded
from macro '__ai'

#define __ai static inline __attribute__((__always_inline__, __nodebug__))

                           ^
...


[1] https://travis-ci.org/github/noloader/BLAKE2/jobs/704535809
[2] https://github.com/BLAKE2/BLAKE2/blob/master/power8/blake2s.c

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