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Apparently, gcc is also not smart enough to infer the alignment
of structure fields, for details see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89133
Use unions to avoid these casts altogether, this fixes compilation
warnings reported by gcc on arm, e.g.:
md5.c: In function 'MD5Update':
md5.c:92:35: error: cast increases required alignment of target type [-Werror=cast-align]
92 | MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in);
| ^
md5.c:101:35: error: cast increases required alignment of target type [-Werror=cast-align]
101 | MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in);
| ^
md5.c: In function 'MD5Final':
md5.c:136:35: error: cast increases required alignment of target type [-Werror=cast-align]
136 | MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in);
| ^
md5.c:147:9: error: cast increases required alignment of target type [-Werror=cast-align]
147 | memcpy((uint32 *)ctx->in + 14, ctx->bits, 2*sizeof(uint32));
| ^
md5.c:149:34: error: cast increases required alignment of target type [-Werror=cast-align]
149 | MD5Name(MD5Transform)(ctx->buf, (uint32 *) ctx->in);
| ^
* modules/pam_namespace/md5.h (struct MD5Context): Replace "buf" and
"in" fields with unions. All users updated.
* modules/pam_unix/md5.h (struct MD5Context): Likewise.
* modules/pam_timestamp/sha1.h (struct sha1_context.pending): Replace
with a union. All users updated.
Complements: v1.4.0~195 ("Fix most of clang -Wcast-align compilation warnings")
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