John Marriott wrote:

> On 03-Sep-2017 04:30, Bram Moolenaar wrote:
> > Patch 8.0.1041
> > Problem:    Bogus characters appear when indenting kicks in while doing a
> >              visual-block append.
> > Solution:   Recompute when indenting is done. (Christian Brabandt)
> > Files:      runtime/doc/visual.txt, src/charset.c, src/edit.c, src/misc1.c,
> >              src/ops.c, src/proto/charset.pro, src/proto/misc1.pro,
> >              src/screen.c, src/spell.c, src/testdir/test_cindent.vim
> >
> >
> After this patch, mingw (x64) throws this warning (on Win8.1 x64):
> gcc -c -Iproto -DWIN32 -DWINVER=0x0603 -D_WIN32_WINNT=0x0603 
> -DHAVE_PATHDEF -DFEAT_NORMAL -DHAVE_STDINT_H -DFEAT_GUI_W32 
> -DFEAT_CLIPBOARD -pipe -march=native -Wall -O3 -fomit-frame-pointer 
> -freg-struct-return -s ops.c -o gobjnative/ops.o
> ops.c: In function 'op_insert':
> ops.c:2605:25: warning: 'ind_pre' may be used uninitialized in this 
> function [-Wmaybe-uninitialized]
>    bd.textcol += ind_post - ind_pre;
>                  ~~~~~~~~~^~~~~~~~~
> 
> 
> ind_post is set unconditionally on line 2602, but ind_pre is only set if 
> oap->block_mode is true.
> The attached patch tries to fix it by initialising it to 0. Please check.
> 
> I am concerned about the struct block_def variable 'bd' (declared on 
> line 2511). It's .is_MAX member is set unconditionally (line 2516), but 
> it's other members only seem to be set via the call to block_prep() if 
> oap->block_mode is true (line 2544). Or am I missing something?

The code using ind_pre should be inside the if for block_mode.
That should fix the warning and make sure "bd" is only set when it's
used.

-- 
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