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Release notes for c-4_5-branch changes

I've applied this patch adding release notes for the constant expressions 
and excess precision changes merged from c-4_5-branch.

I didn't mention the VLA size evaluation fixes (I do not expect normal 
user code to involve side effects in VLA size expressions, which is mainly 
what's affected by those bug fixes).  I didn't mention the stdint.h 
changes since the correct description of those will depend so much on 
whether people fill in the information for all targets.  (Right now it's 
along the lines of "GCC provides a <stdint.h> on a few targets that is 
self-contained for freestanding compilations, so could be e.g. used in 
Linux kernel compilations in a way that glibc's could not."; the aim would 
be for "GCC ensures a C99-conforming <stdint.h> is available on all 
targets for both hosted and freestanding compilations."; any associated 
Fortran changes would of course get their own release note.)

Index: changes.html
RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-4.5/changes.html,v
retrieving revision 1.4
diff -u -r1.4 changes.html
--- changes.html	1 Apr 2009 06:17:44 -0000	1.4
+++ changes.html	1 Apr 2009 16:20:03 -0000
@@ -37,6 +37,10 @@
     found, the compiler exits immediately.  This avoids a cascade of
     errors arising from declarations expected to be found in that
     header being missing.</li>
+    <li>GCC now implements C90- and C99-conforming rules for constant
+    expressions.  This may cause warnings or errors for some code
+    using expressions that can be folded to a constant but are not
+    constant expressions as defined by ISO C.</li>
@@ -57,7 +61,12 @@
-    <li>...</li>
+    <li>GCC now supports handling floating-point excess precision
+    arising from use of the x87 floating-point unit in a way that
+    conforms to ISO C99.  This is enabled
+    with <code>-fexcess-precision=standard</code> and with standards
+    conformance options such as <code>-std=c99</code>, and may be
+    disabled using <code>-fexcess-precision=fast</code>.</li>

Joseph S. Myers

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