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100 lines
3.4 KiB
100 lines
3.4 KiB
6 years ago
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commit b32dcedd13b3fc2ea7a8099cc0f67eaa31b8c298
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Author: Chris Liddell <chris.liddell@artifex.com>
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Date: Thu May 21 09:06:01 2015 +0100
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Simplify/Improve endian decisions in lcms2.h
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Firstly, protect the endian decisions in lcms2.h so that settings given on the
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compiler command line are not silently overridden. Thus being set explicitly
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gets the highest priority.
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Secondly, use the endianness detected by the configure script, and remove the
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complex and error prone stuff for PPC platforms from lcms2.h. Thus the endianess
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from configure gets second highest priority.
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Thirdly, if neither of the above are set, fall back to some simple (and long
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standing) platform/compiler specific tests. These should rarely, if ever, come
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into play in a "normal" build for a "normal" Unix-like system.
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diff --git a/include/lcms2.h b/include/lcms2.h
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index a0421d8..f32beec 100644
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--- a/include/lcms2.h
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+++ b/include/lcms2.h
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@@ -173,46 +173,43 @@
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# define CMS_IS_WINDOWS_ 1
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#endif
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-// Try to detect big endian platforms. This list can be endless, so only some checks are performed over here.
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-// you can pass this toggle to the compiler by using -DCMS_USE_BIG_ENDIAN or something similar
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-
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-#if defined(__sgi__) || defined(__sgi) || defined(sparc)
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-# define CMS_USE_BIG_ENDIAN 1
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-#endif
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+// Try to detect big endian platforms. This list can be endless, so primarily rely on the configure script
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+// on Unix-like systems, and allow it to be set on the compiler command line using
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+// -DCMS_USE_BIG_ENDIAN or something similar
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+#ifdef CMS_USE_BIG_ENDIAN // set at compiler command line takes overall precedence
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+# if CMS_USE_BIG_ENDIAN == 0
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+# undef CMS_USE_BIG_ENDIAN
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+# endif
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+#else // CMS_USE_BIG_ENDIAN
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-#if defined(__s390__) || defined(__s390x__)
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-# define CMS_USE_BIG_ENDIAN 1
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-#endif
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+# ifdef WORDS_BIGENDIAN // set by configure (or explicitly on compiler command line)
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+# define CMS_USE_BIG_ENDIAN 1
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+# else // WORDS_BIGENDIAN
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+// Fall back to platform/compiler specific tests
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+# if defined(__sgi__) || defined(__sgi) || defined(sparc)
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+# define CMS_USE_BIG_ENDIAN 1
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+# endif
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-# ifdef TARGET_CPU_PPC
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-# if TARGET_CPU_PPC
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+# if defined(__s390__) || defined(__s390x__)
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# define CMS_USE_BIG_ENDIAN 1
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# endif
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-# endif
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-#if defined(__powerpc__) || defined(__ppc__) || defined(TARGET_CPU_PPC)
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-# define CMS_USE_BIG_ENDIAN 1
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-# if defined (__GNUC__) && defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN)
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-# if __BYTE_ORDER == __LITTLE_ENDIAN
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-// // Don't use big endian for PowerPC little endian mode
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-# undef CMS_USE_BIG_ENDIAN
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-# endif
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-# endif
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-#endif
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+# ifdef macintosh
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+# ifdef __BIG_ENDIAN__
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+# define CMS_USE_BIG_ENDIAN 1
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+# endif
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+# ifdef __LITTLE_ENDIAN__
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+# undef CMS_USE_BIG_ENDIAN
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+# endif
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+# endif
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+# endif // WORDS_BIGENDIAN
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-// WORDS_BIGENDIAN takes precedence
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-#if defined(_HOST_BIG_ENDIAN) || defined(__BIG_ENDIAN__) || defined(WORDS_BIGENDIAN)
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-# define CMS_USE_BIG_ENDIAN 1
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-#endif
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+# if defined(_HOST_BIG_ENDIAN) || defined(__BIG_ENDIAN__)
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+# define CMS_USE_BIG_ENDIAN 1
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+# endif
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+
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+#endif // CMS_USE_BIG_ENDIAN
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-#ifdef macintosh
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-# ifdef __BIG_ENDIAN__
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-# define CMS_USE_BIG_ENDIAN 1
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-# endif
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-# ifdef __LITTLE_ENDIAN__
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-# undef CMS_USE_BIG_ENDIAN
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-# endif
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-#endif
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// Calling convention -- this is hardly platform and compiler dependent
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#ifdef CMS_IS_WINDOWS_
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