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gconv.h: fix build with GCC 7 

gconv.h is using a flex array to define the __gconv_info member in an
invalid way, causing GCC 7 to issue an error:

| In file included from ../include/gconv.h:1:0,
|                  from ../sysdeps/unix/sysv/linux/_G_config.h:32,
|                  from ../libio/libio.h:31,
|                  from ../include/libio.h:4,
|                  from ../libio/stdio.h:74,
|                  from ../include/stdio.h:5,
|                  from test-math-isinff.cc:22:
| ../iconv/gconv.h:142:50: error: flexible array member '__gconv_info::__data' not at end of 'struct _IO_codecvt'
| In file included from ../include/libio.h:4:0,
|                  from ../libio/stdio.h:74,
|                  from ../include/stdio.h:5,
|                  from test-math-isinff.cc:22:
| ../libio/libio.h:211:14: note: next member '_G_iconv_t _IO_codecvt::__cd_out' declared here
| ../libio/libio.h:187:8: note: in the definition of 'struct _IO_codecvt'
| In file included from ../include/gconv.h:1:0,
|                  from ../sysdeps/unix/sysv/linux/_G_config.h:32,
|                  from ../libio/libio.h:31,
|                  from ../include/libio.h:4,
|                  from ../libio/stdio.h:74,
|                  from ../include/stdio.h:5,
|                  from test-math-isinff.cc:22:
| ../iconv/gconv.h:142:50: error: flexible array member '__gconv_info::__data' not at end of 'struct _IO_wide_data'
| In file included from ../include/libio.h:4:0,
|                  from ../libio/stdio.h:74,
|                  from ../include/stdio.h:5,
|                  from test-math-isinff.cc:22:
| ../libio/libio.h:211:14: note: next member '_G_iconv_t _IO_codecvt::__cd_out' declared here
| ../libio/libio.h:215:8: note: in the definition of 'struct _IO_wide_data'

This is basically a revert to the code from 15 years ago. More details
are available in the GCC bug:
  https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78039

Changelog:
	* iconv/gconv.h (__gconv_info): Define __data element using a
	zero-length array.
This commit is contained in:
Aurelien Jarno 2016-11-06 21:33:10 +01:00
parent 31c351e26d
commit 0623b9e6a9
2 changed files with 6 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2016-11-06 Aurelien Jarno <aurelien@aurel32.net>
* iconv/gconv.h (__gconv_info): Define __data element using a
zero-length array.
2016-11-04 Steve Ellcey <sellcey@caviumnetworks.com>
* math/test-tgmath2.c: Split up test function.

2
iconv/gconv.h
View File

@ -139,7 +139,7 @@ typedef struct __gconv_info
{
size_t __nsteps;
struct __gconv_step *__steps;
__extension__ struct __gconv_step_data __data __flexarr;
__extension__ struct __gconv_step_data __data[0];
} *__gconv_t;
/* Transliteration using the locale's data. */