Changeset 1588 for branches/GNU/src/gcc/BUGS

Timestamp:

Nov 3, 2004, 6:47:21 AM (21 years ago)

Author:

bird

Message:

GCC v3.3.5 - official sources.

File:

• branches/GNU/src/gcc/BUGS (modified) (8 diffs, 1 prop)

branches/GNU/src/gcc/BUGS

@@ -319 +319 @@
 return A();
 
-          This problem occured in a number of variants; in throw
+          This problem occurred in a number of variants; in throw
           statements, people also frequently put the object in
           parentheses.
@@ -377 +377 @@
 C
 
+   Increment/decrement operator (++/--) not working as expected - a
+          [32]problem with many variations.
+          The following expressions have unpredictable results:
+
+x[i]=++i
+foo(i,++i)
+i*(++i)                 /* special case with foo=="operator*" */
+std::cout << i << ++i   /* foo(foo(std::cout,i),++i)          */
+
+          since the i without increment can be evaluated before or after
+          ++i.
+
+          The C and C++ standards have the notion of "sequence points".
+          Everything that happens between two sequence points happens in
+          an unspecified order, but it has to happen after the first and
+          before the second sequence point. The end of a statement and a
+          function call are examples for sequence points, whereas
+          assignments and the comma between function arguments are not.
+
+          Modifying a value twice between two sequence points as shown in
+          the following examples is even worse:
+
+i=++i
+foo(++i,++i)
+(++i)*(++i)               /* special case with foo=="operator*" */
+std::cout << ++i << ++i   /* foo(foo(std::cout,++i),++i)        */
+
+          This leads to undefined behavior (i.e. the compiler can do
+          anything).
+
    Casting does not work as expected when optimization is turned on.
           This is often caused by a violation of aliasing rules, which
@@ -453 +483 @@
 
           For some more insight into the subject, please have a look at
-          [32]this article.
+          [33]this article.
 
    Cannot use preprocessor directive in macro arguments.
@@ -528 +558 @@
           There is a common misconception that the GCC developers are
           responsible for GNU libc. These are in fact two entirely
-          separate projects; please check the [33]GNU libc web pages for
+          separate projects; please check the [34]GNU libc web pages for
           details.
      _________________________________________________________________
@@ -644 +674 @@
    necessary to recompile if you have changed to a bug-fix release of the
    same version of the compiler; bug-fix releases are careful to avoid
-   ABI changes. See also the [34]compatibility section of the GCC manual.
+   ABI changes. See also the [35]compatibility section of the GCC manual.
 
    Remark: A major release is designated by a change to the first or
@@ -657 +687 @@
 
    With each release, we try to make G++ conform closer to the ISO C++
-   standard (available at [35]http://www.ncits.org/cplusplus.htm). We
+   standard (available at [36]http://www.ncits.org/cplusplus.htm). We
    have also implemented some of the core and library defect reports
    (available at
-   [36]http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html &
-   [37]http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html
+   [37]http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html &
+   [38]http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html
    respectively).
 
@@ -766 +796 @@
 
    In addition to the problems listed above, the manual contains a
-   section on [38]Common Misunderstandings with GNU C++.
+   section on [39]Common Misunderstandings with GNU C++.
 
 References
@@ -801 +831 @@
   30. http://gcc.gnu.org/PR323
   31. http://www.validlab.com/goldberg/paper.ps
-  32. http://mail-index.NetBSD.org/tech-kern/2003/08/11/0001.html
-  33. http://www.gnu.org/software/libc/
-  34. http://gcc.gnu.org/onlinedocs/gcc/Compatibility.html
-  35. http://www.ncits.org/cplusplus.htm
-  36. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html
-  37. http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html
-  38. http://gcc.gnu.org/onlinedocs/gcc/C---Misunderstandings.html
+  32. http://gcc.gnu.org/PR11751
+  33. http://mail-index.NetBSD.org/tech-kern/2003/08/11/0001.html
+  34. http://www.gnu.org/software/libc/
+  35. http://gcc.gnu.org/onlinedocs/gcc/Compatibility.html
+  36. http://www.ncits.org/cplusplus.htm
+  37. http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html
+  38. http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html
+  39. http://gcc.gnu.org/onlinedocs/gcc/C---Misunderstandings.html