stdint: respect system's intmax_t if INTMAX_MAX

* lib/stdint.in.h (intmax_t, uintmax_t): If the system defines
INTMAX_MAX, assume its intmax_t is OK.  Similarly for and
uintmax_t.  This is for some Mac OS X builds, where intmax_t is
long but int64_t is long long, and where we will clash with the
system intmax_t if we override it.  See
<http://lists.gnu.org/archive/html/bug-gnulib/2011-07/msg00160.html>.
(INTMAX_C, UINTMAX_C): For consistency, respect the system's
INTMAX_C if INTMAX_MAX and INTMAX_C are both defined, and
similarly for UINTMAX_C.

diff --git a/ChangeLog b/ChangeLog
index e3e802e78ddd1c0eb6af1d4bc1c9ac79b21ca821..41e97e2408823bdd5b1bd0859c6e9e4358a87145 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,16 @@
+2011-07-09  Paul Eggert  <eggert@cs.ucla.edu>
+
+       stdint: respect system's intmax_t if INTMAX_MAX
+       * lib/stdint.in.h (intmax_t, uintmax_t): If the system defines
+       INTMAX_MAX, assume its intmax_t is OK.  Similarly for and
+       uintmax_t.  This is for some Mac OS X builds, where intmax_t is
+       long but int64_t is long long, and where we will clash with the
+       system intmax_t if we override it.  See
+       <http://lists.gnu.org/archive/html/bug-gnulib/2011-07/msg00160.html>.
+       (INTMAX_C, UINTMAX_C): For consistency, respect the system's
+       INTMAX_C if INTMAX_MAX and INTMAX_C are both defined, and
+       similarly for UINTMAX_C.
+
 2011-07-08  Bruno Haible  <bruno@clisp.org>
 
        pthread_sigmask tests: Avoid a compiler warning.

diff --git a/lib/stdint.in.h b/lib/stdint.in.h
index c44401f498b4de7805618e1683c34e3c84ad489e..aa5ca911e343ece86326921fa61714756fd15aa3 100644 (file)
--- a/lib/stdint.in.h
+++ b/lib/stdint.in.h
@@ -270,26 +270,36 @@ typedef unsigned long int gl_uintptr_t;
 /* Note: These types are compiler dependent. It may be unwise to use them in
    public header files. */
 
-#undef intmax_t
-#if @HAVE_LONG_LONG_INT@ && LONG_MAX >> 30 == 1
+/* If the system defines INTMAX_MAX, assume that intmax_t works, and
+   similarly for UINTMAX_MAX and uintmax_t.  This avoids problems with
+   assuming one type where another is used by the system.  */
+
+#ifndef INTMAX_MAX
+# undef INTMAX_C
+# undef intmax_t
+# if @HAVE_LONG_LONG_INT@ && LONG_MAX >> 30 == 1
 typedef long long int gl_intmax_t;
-# define intmax_t gl_intmax_t
-#elif defined GL_INT64_T
-# define intmax_t int64_t
-#else
+#  define intmax_t gl_intmax_t
+# elif defined GL_INT64_T
+#  define intmax_t int64_t
+# else
 typedef long int gl_intmax_t;
-# define intmax_t gl_intmax_t
+#  define intmax_t gl_intmax_t
+# endif
 #endif
 
-#undef uintmax_t
-#if @HAVE_UNSIGNED_LONG_LONG_INT@ && ULONG_MAX >> 31 == 1
+#ifndef UINTMAX_MAX
+# undef UINTMAX_C
+# undef uintmax_t
+# if @HAVE_UNSIGNED_LONG_LONG_INT@ && ULONG_MAX >> 31 == 1
 typedef unsigned long long int gl_uintmax_t;
-# define uintmax_t gl_uintmax_t
-#elif defined GL_UINT64_T
-# define uintmax_t uint64_t
-#else
+#  define uintmax_t gl_uintmax_t
+# elif defined GL_UINT64_T
+#  define uintmax_t uint64_t
+# else
 typedef unsigned long int gl_uintmax_t;
-# define uintmax_t gl_uintmax_t
+#  define uintmax_t gl_uintmax_t
+# endif
 #endif
 
 /* Verify that intmax_t and uintmax_t have the same size.  Too much code
@@ -431,21 +441,23 @@ typedef int _verify_intmax_size[sizeof (intmax_t) == sizeof (uintmax_t)
 
 /* 7.18.2.5. Limits of greatest-width integer types */
 
-#undef INTMAX_MIN
-#undef INTMAX_MAX
-#ifdef INT64_MAX
-# define INTMAX_MIN  INT64_MIN
-# define INTMAX_MAX  INT64_MAX
-#else
-# define INTMAX_MIN  INT32_MIN
-# define INTMAX_MAX  INT32_MAX
+#ifndef INTMAX_MAX
+# undef INTMAX_MIN
+# ifdef INT64_MAX
+#  define INTMAX_MIN  INT64_MIN
+#  define INTMAX_MAX  INT64_MAX
+# else
+#  define INTMAX_MIN  INT32_MIN
+#  define INTMAX_MAX  INT32_MAX
+# endif
 #endif
 
-#undef UINTMAX_MAX
-#ifdef UINT64_MAX
-# define UINTMAX_MAX  UINT64_MAX
-#else
-# define UINTMAX_MAX  UINT32_MAX
+#ifndef UINTMAX_MAX
+# ifdef UINT64_MAX
+#  define UINTMAX_MAX  UINT64_MAX
+# else
+#  define UINTMAX_MAX  UINT32_MAX
+# endif
 #endif
 
 /* 7.18.3. Limits of other integer types */
@@ -568,22 +580,24 @@ typedef int _verify_intmax_size[sizeof (intmax_t) == sizeof (uintmax_t)
 
 /* 7.18.4.2. Macros for greatest-width integer constants */
 
-#undef INTMAX_C
-#if @HAVE_LONG_LONG_INT@ && LONG_MAX >> 30 == 1
-# define INTMAX_C(x)   x##LL
-#elif defined GL_INT64_T
-# define INTMAX_C(x)   INT64_C(x)
-#else
-# define INTMAX_C(x)   x##L
+#ifndef INTMAX_C
+# if @HAVE_LONG_LONG_INT@ && LONG_MAX >> 30 == 1
+#  define INTMAX_C(x)   x##LL
+# elif defined GL_INT64_T
+#  define INTMAX_C(x)   INT64_C(x)
+# else
+#  define INTMAX_C(x)   x##L
+# endif
 #endif
 
-#undef UINTMAX_C
-#if @HAVE_UNSIGNED_LONG_LONG_INT@ && ULONG_MAX >> 31 == 1
-# define UINTMAX_C(x)  x##ULL
-#elif defined GL_UINT64_T
-# define UINTMAX_C(x)  UINT64_C(x)
-#else
-# define UINTMAX_C(x)  x##UL
+#ifndef UINTMAX_C
+# if @HAVE_UNSIGNED_LONG_LONG_INT@ && ULONG_MAX >> 31 == 1
+#  define UINTMAX_C(x)  x##ULL
+# elif defined GL_UINT64_T
+#  define UINTMAX_C(x)  UINT64_C(x)
+# else
+#  define UINTMAX_C(x)  x##UL
+# endif
 #endif
 
 #endif /* !defined __cplusplus || defined __STDC_CONSTANT_MACROS */