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The build of cross-localedef-native is observed to fail under gcc5 hosts
with multiple definition errors, e.g.:
argp-help.o: In function `argp_fmtstream_write':
argp-help.c:(.text+0x1da0): multiple definition of `argp_fmtstream_write'
argp-fmtstream.o:argp-fmtstream.c:(.text+0x7a0): first defined here
The problem is the change of the default C standard from gnu89 to gnu11
which changes the semantics of 'inline'. The issue is described in the
Porting guide at https://gcc.gnu.org/gcc-5/porting_to.html. Adding the
'-fgnu89-inline' option fixes the issue.
(This fix, including the above explanation, was shamelessly copied from
http://git.vahanus.net/?p=csc/ptxdist-kp.git;a=commit;h=2f04a3587bd33c74ccc9be6e115a8b1fde620841.)
Task-number: QTBUG-53862
Change-Id: I88b351b618c2aa9838ec5be6108a26369db5d760
Reviewed-by: Heikki Halmet <heikki.halmet@qt.io>
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