Re: target/7156: Should not attempt to build 32/64 bi-arch compiler on sparc-*-solaris2.[789] if unsupported, bootstrap will fail

Re: target/7156: Should not attempt to build 32/64 bi-arch compiler on sparc-*-solaris2.[789] if unsupported, bootstrap will fail

[davem]

Synopsis: Should not attempt to build 32/64 bi-arch compiler on sparc-*-solaris2.[789] if unsupported, bootstrap will fail

State-Changed-From-To: open->closed
State-Changed-By: davem
State-Changed-When: Fri Jun 28 08:26:08 2002
State-Changed-Why:
    The build instructions are very precise in telling the user
    that they must "--disable-multilib" on the configure command
    line if their system does not support generation of 64-bit
    binaries.
    
    Several attempts were made close to the 3.1 release to automate this but none of them proved to be reliable and
    do the right thing in cross-compilation scenerios.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7156

Re: target/7156: Should not attempt to build 32/64 bi-arch compiler on sparc-*-solaris2.[789] if unsupported, bootstrap will fail

[Mark Mentovai]

The following reply was made to PR target/7156; it has been noted by GNATS.

From: Mark Mentovai <mark@moxienet.com>
To: <davem@gcc.gnu.org>, <gcc-bugs@gcc.gnu.org>,
	<gcc-gnats@gcc.gnu.org>
Cc:  
Subject: Re: target/7156: Should not attempt to build 32/64 bi-arch
	compiler on sparc-*-solaris2.[789] if unsupported, bootstrap will fail
Date: Fri, 28 Jun 2002 19:17:32 -0400

 davem@gcc.gnu.org wrote:
 >   The build instructions are very precise in telling the user
 >   that they must "--disable-multilib" on the configure command
 >   line if their system does not support generation of 64-bit
 >   binaries.
 >   
 >   Several attempts were made close to the 3.1 release to automate this but
 > none of them proved to be reliable and
 >   do the right thing in cross-compilation scenerios.
 
 Something else must be wrong then if cross-compiling is an important
 consideration: libjava refuses to configure itself when being cross-compiled
 (as described in the PR).
 
 gcc-3.1/libjava/configure:3922
 
   if test "$cross_compiling" = yes; then
     { echo "configure: error: Cannot check for file existence when cross
 compiling" 1>&2; exit 1; }
 else
 # ...
   fi
 
 Provided that this could be fixed, what seems like the correct solution
 would be to check for the appropriate support packages (SUNWarcx and
 SUNWcslx) and automatically disable multilib if both are not present only
 when doing a native build, and retain the current behavior when doing a
 cross build.
 
 Mark
 

target/7156: Should not attempt to build 32/64 bi-arch compiler on sparc-*-solaris2.[789] if unsupported, bootstrap will fail

[mark]

>Number:         7156
>Category:       target
>Synopsis:       Should not attempt to build 32/64 bi-arch compiler on sparc-*-solaris2.[789] if unsupported, bootstrap will fail
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 28 07:16:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Mark Mentovai
>Release:        3.1, gcc-3_1-branch 3.1.1 20020625 (prerelease), and gcc 3.2 20020618 (experimental)
>Organization:
>Environment:
System: SunOS oak 5.7 Generic_106541-16 sun4m sparc SUNW,SPARCstation-20
Architecture: sun4
Sun SPARCstation 20, 150MHz hyperSPARC, 128MB, 3x4.4GB
Sun Solaris 7 3/99 MU 4
host: sparc-sun-solaris2.7
build: sparc-sun-solaris2.7
target: sparc-sun-solaris2.7
configured with: ../gcc-3.1/configure --enable-shared --with-gnu-as --with-gnu-ld --enable-threads --with-cpu=hypersparc --enable-libgcj --with-system-zlib
>Description:
The build system currently attempts to build a 32/64-bit bi-arch compiler on sparc-*-solaris2.[789] regardless of the system's ability to support such a build.

In order to bootstrap the compiler, the libraries for all environments must be present.  When building a 32/64-bit bi-arch compiler, the libraries for both the 32- and 64-bit environments must be available.  They are usually not present on 32-bit systems (for systems manufactured by Sun, this is anything prior to the Ultra).

Even if both 32- and 64-bit libraries are installed on a 32-bit system, the bootstrap can fail when attempting to build support libraries for some languages.  For example, the configuration of libjava for sparcv9 will fail with:

checking for /proc/self/exe... configure: error: Cannot check for file existence when cross compiling
>How-To-Repeat:
On a 32-bit pre-sun4u system (sun4m, sun4c) running Solaris 7, 8, or 9:

sh ../gcc-3.1/configure --enable-shared --with-gnu-as --with-gnu-ld --enable-threads --with-cpu=hypersparc --enable-libgcj --with-system-zlib
make bootstrap
>Fix:
This patch causes config.gcc to determine whether or not the 64-bit sparcv9 environment is supported, and exclude 64-bit support if it is not.

If the configure scripts for libjava and others can be fixed to not give errors such as the one above, a more appropriate check would be for whether or not the appropriate 64-bit libraries are installed.  If both "pkginfo -q SUNWarcx" and "pkginfo -q SUNWcslx" exit with status 0, even on a system that is incapable of executing 64-bit sparcv9 executables, it is reasonably safe to assume that it is capable of building 64-bit sparcv9 executables.
>Release-Note:
>Audit-Trail:
>Unformatted:
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