[bug-libunistring] unistr.h (built from master) contains gnulib symbol _GL_ATTRIBUTE_MAYBE_UNUSED

[Tim Rühsen]

Hi,

when building libunistring from git master, the compilation fails when 
including unistr.h:

Step #13: In file included from psl.c:96:
Step #13: /src/wget_deps/include/unistr.h:203:39: error: unknown type 
name '_GL_ATTRIBUTE_MAYBE_UNUSED'
Step #13:                    const uint32_t *s, 
_GL_ATTRIBUTE_MAYBE_UNUSED size_t n)
Step #13:                                       ^
Step #13: /src/wget_deps/include/unistr.h:203:73: error: expected ')'
Step #13:                    const uint32_t *s, 
_GL_ATTRIBUTE_MAYBE_UNUSED size_t n)
Step #13: 
         ^
Step #13: /src/wget_deps/include/unistr.h:202:19: note: to match this '('
Step #13: u32_mbtouc_unsafe (ucs4_t *puc,
Step #13:                   ^
Step #13: /src/wget_deps/include/unistr.h:270:13: error: unknown type 
name '_GL_ATTRIBUTE_MAYBE_UNUSED'
Step #13:             _GL_ATTRIBUTE_MAYBE_UNUSED size_t n)
Step #13:             ^
Step #13: /src/wget_deps/include/unistr.h:270:47: error: expected ')'
Step #13:             _GL_ATTRIBUTE_MAYBE_UNUSED size_t n)
Step #13:                                               ^
Step #13: /src/wget_deps/include/unistr.h:269:12: note: to match this '('
Step #13: u32_mbtouc (ucs4_t *puc, const uint32_t *s,
Step #13:            ^
Step #13: 4 errors generated.

Regards, Tim

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