PR libstdc++/17005 (fix for HP-UX 11.11)

[thirdparty/gcc.git] / gcc / doc / install.texi

diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index bc4e8541c7415a803a8884ca22070cdc645956e6..93e009002e48afd9dab482d78d07838c3c642cba 100644 (file)
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -2608,10 +2608,10 @@ We @emph{highly} recommend using gas/binutils on all hppa platforms;
 you may encounter a variety of problems when using the HP assembler.
 
 Specifically, @option{-g} does not work on HP-UX (since that system
-uses a peculiar debugging format which GCC does not know about), unless you
-use GAS and GDB and configure GCC with the
+uses a peculiar debugging format which GCC does not know about), unless
+you use GAS and GDB.  It may be helpful to configure GCC with the
 @uref{./configure.html#with-gnu-as,,@option{--with-gnu-as}} and
-@option{--with-as=@dots{}} options.
+@option{--with-as=@dots{}} options to ensure that GCC can find GAS.
 
 If you wish to use the pa-risc 2.0 architecture support with a 32-bit
 runtime, you must use either the HP assembler, or gas/binutils 2.11
@@ -2629,6 +2629,16 @@ configuring if you want a model other than PROCESSOR_8000.  The macro
 TARGET_SCHED_DEFAULT can be defined in BOOT_CFLAGS if a different
 default scheduling model is desired.
 
+As of GCC 3.5, GCC uses the UNIX 95 namespace for HP-UX 10.10
+through 11.00, and the UNIX 98 namespace for HP-UX 11.11 and later.
+This namespace change might cause problems when bootstrapping with
+an earlier version of GCC or the HP compiler as essentially the same
+namespace is required for an entire build.  This problem can be avoided
+in a number of ways.  With HP cc, @env{UNIX_STD} can be set to @samp{95}
+or @samp{98}.  Another way is to add an appropriate set of predefines
+to @env{CC}.  The description for the @option{munix=} option contains
+a list of the predefines used with each standard.
+
 More specific information to @samp{hppa*-hp-hpux*} targets follows.
 
 @html