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Quell -Wcast-align warnings from Clang

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The stbi__sbraw() macro in stb_image_write.h causes Clang to spew about 24
warnings complaining that "cast from 'unsigned char *' to 'int *' increases
required alignment from 1 to 4" when compiled with the -Wcast-align option.

In practice, this is spurious so long as STBIW_MALLOC() and STBIW_REALLOC()
follow the usual alignment semantics for malloc() and realloc() in that they
align sufficiently for any built-in type.

To quell the warning, we can cast through a void pointer as an intermediary.
This commit is contained in:
Andrew Kensler 2019-11-15 23:51:00 -08:00
parent f67165c2bb
commit 57b9ea6510
2 changed files with 2 additions and 2 deletions
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2
stb_image_write.h
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@ -774,7 +774,7 @@ STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const
#ifndef STBIW_ZLIB_COMPRESS
// stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size()
#define stbiw__sbraw(a) ((int *) (a) - 2)
#define stbiw__sbraw(a) ((int *) (void *) (a) - 2)
#define stbiw__sbm(a) stbiw__sbraw(a)[0]
#define stbiw__sbn(a) stbiw__sbraw(a)[1]

2
stretchy_buffer.h
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@ -188,7 +188,7 @@
#define stb_sb_add(a,n) (stb__sbmaybegrow(a,n), stb__sbn(a)+=(n), &(a)[stb__sbn(a)-(n)])
#define stb_sb_last(a) ((a)[stb__sbn(a)-1])
#define stb__sbraw(a) ((int *) (a) - 2)
#define stb__sbraw(a) ((int *) (void *) (a) - 2)
#define stb__sbm(a) stb__sbraw(a)[0]
#define stb__sbn(a) stb__sbraw(a)[1]