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06426297c4
In commit a2380157f6 ("toolchain: enable
libquadmath for PowerPC with VSX"), the definition of
BR2_TOOLCHAIN_HAS_LIBQUADMATH has been extended to also be true when
BR2_POWERPC_CPU_HAS_VSX.
However, practical experiments show that when 64-bit VSX-capable cores
are used in 32-bit mode, libquadmath is not built by GCC, causing
build failures:
cp: cannot stat '/home/autobuild/autobuild/instance-3/output-1/host/powerpc-buildroot-linux-musl/lib*/libquadmath*': No such file or directory
We did an extensive testing, building the 27 combinations of:
- GCC versions: 14, 15, 16
- C library: glibc, uclibc, musl
- PowerPC 32-bit, PowerPC 64-bit, PowerPC 64-bit little endian
This testing provides the following results:
| gcc14 | powerpc64 | glibc | OK |
| gcc14 | powerpc64le | glibc | OK |
| gcc14 | powerpc64le | musl | OK |
| gcc14 | powerpc64le | uclibc | SKIPPED |
| gcc14 | powerpc64 | musl | OK |
| gcc14 | powerpc64 | uclibc | SKIPPED |
| gcc14 | powerpc | glibc | FAILED |
| gcc14 | powerpc | musl | FAILED |
| gcc14 | powerpc | uclibc | FAILED |
| gcc15 | powerpc64 | glibc | OK |
| gcc15 | powerpc64le | glibc | OK |
| gcc15 | powerpc64le | musl | OK |
| gcc15 | powerpc64le | uclibc | SKIPPED |
| gcc15 | powerpc64 | musl | OK |
| gcc15 | powerpc64 | uclibc | SKIPPED |
| gcc15 | powerpc | glibc | FAILED |
| gcc15 | powerpc | musl | FAILED |
| gcc15 | powerpc | uclibc | FAILED |
| gcc16 | powerpc64 | glibc | OK |
| gcc16 | powerpc64le | glibc | OK |
| gcc16 | powerpc64le | musl | OK |
| gcc16 | powerpc64le | uclibc | SKIPPED |
| gcc16 | powerpc64 | musl | OK |
| gcc16 | powerpc64 | uclibc | SKIPPED |
| gcc16 | powerpc | glibc | FAILED |
| gcc16 | powerpc | musl | FAILED |
| gcc16 | powerpc | uclibc | FAILED |
The "SKIPPED" are when the configuration is not possible: uClibc
doesn't support powerpc64 or powerpc64le.
Then, as we can see, the build fails for all "powerpc"
configuration. Our conclusion is therefore that libquadmath is not
supported on PowerPC 32-bit. While we were not able to find direct
evidence in the gcc code base, this practical experiment shows that is
simply doesn't work on PowerPC 32-bit.
So, we take the logical action of adjusting
BR2_TOOLCHAIN_HAS_LIBQUADMATH so that it is true only on
powerpc64/powerpc64le.
Fixes:
https://autobuild.buildroot.org/results/46d435c9f5086a8695f4f6cd4026bb0d194de13c/
Cc: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>