install.texi (*-ibm-aix*): Update assembler and exception handling information.

        * doc/install.texi (*-ibm-aix*): Update assembler and exception
        handling information.
        * doc/trouble.texi (Interoperation): Add libstdc++ information
        for AIX.
        (Misunderstandings): Add template instantiation and static template
        member information for AIX.

From-SVN: r48962

1 files changed, 7 insertions, 17 deletions

diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 6d1ea9b..1c110c5 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -2512,14 +2512,15 @@ does not provide a definition that will confuse @command{configure}.
 If this error occurs during stage2 or later, then the problem most likely
 is the version of Make (see above).
 
-Binutils 2.10 does not support AIX 4.3.  Binutils available from the
-@uref{http://www-1.ibm.com/servers/aix/products/aixos/linux/,,AIX
-Toolbox for Linux: GNU and Open Source tools for AIX};
-website does work.  Binutils 2.11 is expected to include AIX 4.3
-support.  The GNU Assembler is necessary for @samp{libstdc++} to build.  The
-AIX native @command{ld} still is recommended.  The native AIX tools do
+The GNU Assembler incorrectly reports that it supports WEAK symbols on
+AIX which causes GCC to try to utilize weak symbol functionality which
+is not really supported on the platform.  The native @command{as} and
+@command{ld} still are recommended.  The native AIX tools do
 interoperate with GCC@.
 
+Building @file{libstdc++.a} requires a fix for a AIX Assembler bug
+APAR IY26685 (AIX 4.3) or APAR IY25528 (AIX 5.1).
+
 Linking executables and shared libraries may produce warnings of
 duplicate symbols.  The assembly files generated by GCC for AIX always
 have included multiple symbol definitions for certain global variable
@@ -2527,17 +2528,6 @@ and function declarations in the original program.  The warnings should
 not prevent the linker from producing a correct library or runnable
 executable.
 
-GCC's exception handling implementation stores process-specific data in
-the shared library which prevents exception handling from working
-correctly on AIX in a default installation.  To work around this, the
-shared objects need to be loaded in the process private segment to
-prevent them from being shared and marked read-only.  This is
-accomplished on AIX by installing the shared libraries
-(@file{libgcc_s.a} and @file{libstdc++.a}) with file permissions
-disallowing read-other (@samp{chmod a+x,o-r}).  If the shared libraries
-have been used, the shared library segment can be cleaned using the
-@samp{/usr/sbin/slibclean} command.
-
 AIX 4.3 utilizes a ``large format'' archive to support both 32-bit and
 64-bit object modules.  The routines provided in AIX 4.3.0 and AIX 4.3.1
 to parse archive libraries did not handle the new format correctly.