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+ Wed, 27 Nov 2013 10:04:24 +0200 (EET)\r
+From: Tomi Ollila <tomi.ollila@iki.fi>\r
+To: david@tethera.net, notmuch@notmuchmail.org\r
+Subject: Re: [PATCH v2] util: detect byte order\r
+In-Reply-To: <1385512694-32526-1-git-send-email-david@tethera.net>\r
+References: <m2txezqcuf.fsf@guru.guru-group.fi>\r
+ <1385512694-32526-1-git-send-email-david@tethera.net>\r
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+Date: Wed, 27 Nov 2013 10:04:24 +0200\r
+Message-ID: <m2haaynud3.fsf@guru.guru-group.fi>\r
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+\r
+On Wed, Nov 27 2013, david@tethera.net wrote:\r
+\r
+> From: David Bremner <david@tethera.net>\r
+>\r
+> Unfortunately old versions of GCC and clang do not provide byte order\r
+> macros, so we re-invent them.\r
+>\r
+> If UTIL_BYTE_ORDER is not defined or defined to 0, we fall back to\r
+> macros supported by recent versions of GCC and clang\r
+> ---\r
+>\r
+> I think I got all of Tomi's comments, including the most serious one\r
+> about the test in endian-utils.h (LITTLE twice instead of BIG,\r
+> LITTLE).\r
+\r
+Agreed. LGTM.\r
+\r
+You may want to amend the '#' out of the line\r
+\r
++#rm -f _byteorder _byteorder.c\r
+\r
+before pushing ?\r
+\r
+Tomi\r
+\r
+\r
+>\r
+> configure | 24 ++++++++++++++++++++++--\r
+> lib/libsha1.c | 21 +++++++--------------\r
+> util/endian-util.h | 38 ++++++++++++++++++++++++++++++++++++++\r
+> 3 files changed, 67 insertions(+), 16 deletions(-)\r
+> create mode 100644 util/endian-util.h\r
+>\r
+> diff --git a/configure b/configure\r
+> index 1a8e939..a0c6771 100755\r
+> --- a/configure\r
+> +++ b/configure\r
+> @@ -441,6 +441,19 @@ else\r
+> EOF\r
+> fi\r
+> \r
+> +printf "Checking byte order... "\r
+> +cat> _byteorder.c <<EOF\r
+> +#include <stdio.h>\r
+> +#include <stdint.h>\r
+> +uint32_t test = 0x34333231;\r
+> +int main() { printf("%.4s\n", (const char*)&test); return 0; }\r
+> +EOF\r
+> +${CC} ${CFLAGS} _byteorder.c -o _byteorder > /dev/null 2>&1\r
+> +util_byte_order=$(./_byteorder)\r
+> +echo $util_byte_order\r
+> +\r
+> +#rm -f _byteorder _byteorder.c\r
+> +\r
+> if [ $errors -gt 0 ]; then\r
+> cat <<EOF\r
+> \r
+> @@ -702,6 +715,9 @@ prefix = ${PREFIX}\r
+> # LIBDIR_IN_LDCONFIG value below is still set correctly.\r
+> libdir = ${LIBDIR:=\$(prefix)/lib}\r
+> \r
+> +# byte order within a 32 bit word. 1234 = little, 4321 = big, 0 = guess\r
+> +UTIL_BYTE_ORDER = ${util_byte_order}\r
+> +\r
+> # Whether libdir is in a path configured into ldconfig\r
+> LIBDIR_IN_LDCONFIG = ${libdir_in_ldconfig}\r
+> \r
+> @@ -807,7 +823,9 @@ CONFIGURE_CFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\\r
+> -DHAVE_STRSEP=\$(HAVE_STRSEP) \\\r
+> -DSTD_GETPWUID=\$(STD_GETPWUID) \\\r
+> -DSTD_ASCTIME=\$(STD_ASCTIME) \\\r
+> - -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)\r
+> + -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT) \\\r
+> + -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)\r
+> +\r
+> CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\\r
+> \$(TALLOC_CFLAGS) -DHAVE_VALGRIND=\$(HAVE_VALGRIND) \\\r
+> \$(VALGRIND_CFLAGS) \$(XAPIAN_CXXFLAGS) \\\r
+> @@ -815,6 +833,8 @@ CONFIGURE_CXXFLAGS = -DHAVE_GETLINE=\$(HAVE_GETLINE) \$(GMIME_CFLAGS) \\\r
+> -DHAVE_STRSEP=\$(HAVE_STRSEP) \\\r
+> -DSTD_GETPWUID=\$(STD_GETPWUID) \\\r
+> -DSTD_ASCTIME=\$(STD_ASCTIME) \\\r
+> - -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT)\r
+> + -DHAVE_XAPIAN_COMPACT=\$(HAVE_XAPIAN_COMPACT) \\\r
+> + -DUTIL_BYTE_ORDER=\$(UTIL_BYTE_ORDER)\r
+> +\r
+> CONFIGURE_LDFLAGS = \$(GMIME_LDFLAGS) \$(TALLOC_LDFLAGS) \$(XAPIAN_LDFLAGS)\r
+> EOF\r
+> diff --git a/lib/libsha1.c b/lib/libsha1.c\r
+> index 87c7c52..aaaa4eb 100644\r
+> --- a/lib/libsha1.c\r
+> +++ b/lib/libsha1.c\r
+> @@ -34,7 +34,7 @@\r
+> */\r
+> \r
+> #include <string.h> /* for memcpy() etc. */\r
+> -\r
+> +#include "endian-util.h"\r
+> #include "libsha1.h"\r
+> \r
+> #if defined(__cplusplus)\r
+> @@ -49,20 +49,13 @@ extern "C"\r
+> \r
+> #define bswap_32(x) ((rotr32((x), 24) & 0x00ff00ff) | (rotr32((x), 8) & 0xff00ff00))\r
+> \r
+> -/* The macros __BYTE_ORDER__ and __ORDER_*_ENDIAN__ are GNU C\r
+> - * extensions. They are also supported by clang as of v3.2 */\r
+> -\r
+> -#ifdef __BYTE_ORDER__\r
+> -# if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)\r
+> -# define bsw_32(p,n) \\r
+> - { int _i = (n); while(_i--) ((uint32_t*)p)[_i] = bswap_32(((uint32_t*)p)[_i]); }\r
+> -# elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)\r
+> -# define bsw_32(p,n)\r
+> -# else\r
+> -# error "unknown byte order"\r
+> -# endif\r
+> +#if (UTIL_BYTE_ORDER == UTIL_ORDER_LITTLE_ENDIAN)\r
+> +# define bsw_32(p,n) \\r
+> + { int _i = (n); while(_i--) ((uint32_t*)p)[_i] = bswap_32(((uint32_t*)p)[_i]); }\r
+> +#elif (UTIL_BYTE_ORDER == UTIL_ORDER_BIG_ENDIAN)\r
+> +# define bsw_32(p,n)\r
+> #else\r
+> -# error "macro __BYTE_ORDER__ is not defined"\r
+> +# error "Unsupported byte order"\r
+> #endif\r
+> \r
+> #define SHA1_MASK (SHA1_BLOCK_SIZE - 1)\r
+> diff --git a/util/endian-util.h b/util/endian-util.h\r
+> new file mode 100644\r
+> index 0000000..bc80c40\r
+> --- /dev/null\r
+> +++ b/util/endian-util.h\r
+> @@ -0,0 +1,38 @@\r
+> +/* this file mimics the macros present in recent GCC and CLANG */\r
+> +\r
+> +#ifndef _ENDIAN_UTIL_H\r
+> +#define _ENDIAN_UTIL_H\r
+> +\r
+> +/* This are prefixed with UTIL to avoid collisions\r
+> + *\r
+> + * You can use something like the following to define UTIL_BYTE_ORDER\r
+> + * in a configure script.\r
+> + */\r
+> +#if 0\r
+> +#include <stdio.h>\r
+> +#include <stdint.h>\r
+> +uint32_t test = 0x34333231;\r
+> +int main() { printf("%.4s\n", (const char*)&test); return 0; }\r
+> +#endif\r
+> +\r
+> +#define UTIL_ORDER_BIG_ENDIAN 4321\r
+> +#define UTIL_ORDER_LITTLE_ENDIAN 1234\r
+> +\r
+> +\r
+> +#if !defined(UTIL_BYTE_ORDER) || ((UTIL_BYTE_ORDER != UTIL_ORDER_BIG_ENDIAN) && \\r
+> + (UTIL_BYTE_ORDER != UTIL_ORDER_LITTLE_ENDIAN))\r
+> +#undef UTIL_BYTE_ORDER\r
+> +#ifdef __BYTE_ORDER__\r
+> +# if (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)\r
+> +# define UTIL_BYTE_ORDER UTIL_ORDER_LITTLE_ENDIAN\r
+> +# elif (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)\r
+> +# define UTIL_BYTE_ORDER UTIL_ORDER_BIG_ENDIAN\r
+> +# else\r
+> +# error "Unsupported __BYTE_ORDER__"\r
+> +# endif\r
+> +#else\r
+> +# error "UTIL_BYTE_ORDER not correctly defined and __BYTE_ORDER__ not defined."\r
+> +#endif\r
+> +#endif\r
+> +\r
+> +#endif\r
+> -- \r
+> 1.8.4.2\r
+>\r
+> _______________________________________________\r
+> notmuch mailing list\r
+> notmuch@notmuchmail.org\r
+> http://notmuchmail.org/mailman/listinfo/notmuch\r
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