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

[mark@moxienet.com]

>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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