Output bad locale warning in regex synthetic start class

[perl5.git] / README.aix

diff --git a/README.aix b/README.aix
index 8f56e2f..16409c2 100644 (file)
--- a/README.aix
+++ b/README.aix
@@ -4,7 +4,7 @@ designed to be readable as is.
 
 =head1 NAME
 
-README.aix - Perl version 5 on IBM AIX (UNIX) systems
+perlaix - Perl version 5 on IBM AIX (UNIX) systems
 
 =head1 DESCRIPTION
 
@@ -157,6 +157,22 @@ With the default setting the size is limited to 128MB.
 The -1 removes this limit. If the "make test" fails please change
 your /etc/security/limits as stated above.
 
+=head2 Long doubles
+
+IBM calls its implementation of long doubles 128-bit, but it is not
+the IEEE 128-bit ("quadruple precision") which would give 116 bit of
+mantissa (nor it is implemented in hardware), instead it's a special
+software implementation called "double-double", which gives 106 bits
+of mantissa.
+
+There seem to be various problems in this long double implementation.
+If Configure detects this brokenness, it will disable the long double support.
+This can be overriden with explicit C<-Duselongdouble> (or C<-Dusemorebits>,
+which enables both long doubles and 64 bit integers).  If you decide to
+enable long doubles, for most of the broken things Perl has implemented
+workarounds, but the handling of the special values infinity and NaN
+remains badly broken: for example infinity plus zero results in NaN.
+
 =head2 Recommended Options AIX 5.1/5.2/5.3/6.1 and 7.1 (threaded/32-bit)
 
 With the following options you get a threaded Perl version which
@@ -229,6 +245,15 @@ following option:
     -Dcc='gcc -maix64'
 
 
+=head2 Compiling Perl 5 on AIX 7.1.0
+
+A regression in AIX 7 causes a failure in make test in Time::Piece during
+daylight savings time.  APAR IV16514 provides the fix for this.  A quick
+test to see if it's required, assuming it is currently daylight savings
+in Eastern Time, would be to run C< TZ=EST5 date +%Z >.  This will come
+back with C<EST> normally, but nothing if you have the problem.
+
+
 =head2 Compiling Perl 5 on older AIX versions up to 4.3.3
 
 Due to the fact that AIX 4.3.3 reached end-of-service in December 31,
@@ -484,7 +509,6 @@ therefore in AIX 4.2 Perl is not linked against the libC_r.
 
 =head1 AUTHORS
 
-H.Merijn Brand <h.m.brand@xs4all.nl>
 Rainer Tammer <tammer@tammer.net>
 
 =cut