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bug#11082: 24.0.94; u.glyphless member in struct glyph does not fit in 3
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From: |
YAMAMOTO Mitsuharu |
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Subject: |
bug#11082: 24.0.94; u.glyphless member in struct glyph does not fit in 32 bits |
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Date: |
Sun, 25 Mar 2012 09:29:25 +0900 |
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User-agent: |
Wanderlust/2.14.0 (Africa) SEMI/1.14.6 (Maruoka) FLIM/1.14.8 (Shijō) APEL/10.6 Emacs/22.3 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI) |
>>>>> On Sat, 24 Mar 2012 09:54:09 +0100, Andreas Schwab
>>>>> <schwab@linux-m68k.org> said:
>> ?? Isn't the size of a union defined by its widest member?
> The size of u.val is defined by the size of unsigned.
>> If so, we just end up wasting some storage here, but we should
>> never truncate a bit field.
> It's not about truncation, but about ignored bits in GLYPH_EQUAL_P.
Yes, I meant that.
A test case is as follows. I checked it with Ubuntu 11.10, GTK+
build.
1. emacs -Q
2. (insert #xe0100) C-j
3. C-p C-p C-e C-b C-b C-d 1 C-e
Now the line at the cursor is "(insert #xe0101)".
4. C-j
The glyphless glyph just added is shown as "0E0100" instead of
"0E0101".
YAMAMOTO Mitsuharu
mituharu@math.s.chiba-u.ac.jp