src/pcre2_intmodedep.h: fix alignment of fields in struct heapframe
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pcre2_intmodedep.h has a check to verify that the size of the struct
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heapframe is a multiple of 4 bytes. On most architectures this works
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fine, but not on m68k. Indeed, when building the 16-bit variant of
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pcre2, the heapframe structure contains:
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PCRE2_UCHAR occu[2];
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PCRE2_SPTR eptr;
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Where PCRE2_UCHAR is a 16-bit data type, and PCRE2_SPTR is a
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pointer. The occu[] array starts at byte 0x32, so not aligned on a
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32-bit boundary. With 2 x 16-bit, the occur[] array ends at byte 0x36.
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Now, on most architectures, the alignment required for a pointer will
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make the eptr field start at 0x38 (on 32 bit architectures). However,
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on m68k, it is fine to have a pointer aligned only on a 16-bit
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boundary, and the eptr pointer will be at offset 0x36.
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This doesn't cause a problem per-se, but breaks the check that
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heapframe should be a multiple of 4 bytes.
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To fix this, we make sure eptr is aligned by introducing an unused
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field of 16 bits after the occu[] array (in the 16-bit variant) or
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after the occu[] array (in the 32-bit variant). These choices have
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been made to keep the structure layout unchanged.
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Fixes the following build failure on m68k:
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src/pcre2_intmodedep.h:818:14: error: size of array 'check_heapframe_size' is negative
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typedef char check_heapframe_size[
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^~~~~~~~~~~~~~~~~~~~
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Upstream: https://bugs.exim.org/show_bug.cgi?id=2247
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Index: src/pcre2_intmodedep.h
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===================================================================
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--- a/src/pcre2_intmodedep.h (revision 923)
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+++ b/src/pcre2_intmodedep.h (working copy)
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@@ -797,7 +797,9 @@
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PCRE2_UCHAR occu[6]; /* Used for other case code units */
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#elif PCRE2_CODE_UNIT_WIDTH == 16
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PCRE2_UCHAR occu[2]; /* Used for other case code units */
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+ uint8_t unused[2]; /* Ensure 32 bit alignment */
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#else
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+ uint8_t unused[2]; /* Ensure 32 bit alignment */
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PCRE2_UCHAR occu[1]; /* Used for other case code units */
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#endif
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