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The test `llvm/unittests/Support/CommandLineTest.cpp` that handles errors in expansion of response files was previously disabled for AIX. Originally the code was dependent on `read` returning `EISDIR` which occurs on platforms such as Linux. However, other platforms such as AIX allow use of `read` on file descriptors for directories. This change updates `readNativeFile` to produce `EISDIR` on AIX and z/OS when used on a directory (instead of relying on the call to `read` to do so). --------- Co-authored-by: Alison Zhang <alisonzhang@ibm.com> Co-authored-by: James Henderson <46713263+jh7370@users.noreply.github.com>
llvm/lib/Support/Unix README =========================== This directory provides implementations of the lib/System classes that are common to two or more variants of UNIX. For example, the directory structure underneath this directory could look like this: Unix - only code that is truly generic to all UNIX platforms Posix - code that is specific to Posix variants of UNIX SUS - code that is specific to the Single Unix Specification SysV - code that is specific to System V variants of UNIX As a rule, only those directories actually needing to be created should be created. Also, further subdirectories could be created to reflect versions of the various standards. For example, under SUS there could be v1, v2, and v3 subdirectories to reflect the three major versions of SUS.