Ensure the tests do not fail during cross compilation by specifying
the dynamic loader prefix for a GNU installation that is expected to
support IEEE 128-bit long double.
Reviewed By: qiucf
Differential Revision: https://reviews.llvm.org/D143736
When -mabi=ieeelongdouble is enabled by default, libc++ does not support
-mabi=ibmlongdouble.
Reviewed By: qiucf
Differential Revision: https://reviews.llvm.org/D139450
Clang detects the GCC version from the libdir. However, modern
GCC versions only include the major version in the libdir
(something like lib/gcc/powerpc64le-linux-gnu/12/), not all
version components. For this reason, even though the system has
a supported libstdcxx, it will still fail the check against the
12.1.0 version requirement.
Fix this by doing the same thing we do for patch versions: Assume
that a missing minor version is larger than any specific version.
To allow this to be tested, we need to fix two additional issues:
First, the GCC toolchain directories used for testing need to
contain a crtbegin.o file to be properly detected. The existing
tests actually ended up using a 0.0.0 version, rather the intended
one. Second, we also need to satisfy the glibc version check based
on the dynamic linker. To do so, respect the --dyld-prefix argument
and add the necessary file to the test toolchain directory.
Differential Revision: https://reviews.llvm.org/D136258
GCC 12 should have proper support for IEEE-754 compliant 128-bit
floating point in libstdc++. So warning is needed when linking against
older libstdc++ versions or LLVM libc++.
Glibc starts supporting float128 in both header and libraries since
2.32.
Reviewed By: jsji
Differential Revision: https://reviews.llvm.org/D112906
