I recently found two libstdc++ testcases failing on some Solaris hosts
for 32-bit only:
FAIL: 27_io/filesystem/operations/space.cc execution test
FAIL: experimental/filesystem/operations/space.cc execution test
Both file in the same way:
terminate called after throwing an instance of 'std::filesystem::__cxx11::filesystem_error'
what(): filesystem error: cannot get free space: Value too large for defined data type [.]
However, the test PASSes just fine on other systems.
It turns out that the tests FAIL with
statvfs(".", 0xFEFFDB64) Err#79 EOVERFLOW
On the failing system, the build filesystem is 3.4 TB, thus the
EOVERFLOW.
It seems g++ on Solaris doesn't fully enable largefile support: it has
-D_LARGEFILE_SOURCE=1 in gcc/config/sol2.h (TARGET_OS_CPP_BUILTINS), but
lacks -D_FILE_OFFSET_BITS=64 which is required to get the
largefile-aware functions (statvfs64 in this case).
The following patch adds that, fixing the two failures.
Bootstrapped without regressions on i386-pc-solaris2.1[01] and
sparc-sun-solaris2.1[01].
Unless someone has an idea why this might cause problems, I'll install
the patch on mainline and backport to the gcc-7 and gcc-8 branches.