commit 1800a38fb7d8d4f923fc450875afa3bc16f01151
author Shahbaz Youssefi <syoussefi@google.com> Tue Dec 10 10:01:25 2019 -0500
committer Shahbaz Youssefi <syoussefi@chromium.org> Mon Dec 16 13:01:59 2019 -0500
tree 944119bf036d3169cc2cbfa0c01930d0ee75f362
parent 4b7809c2f5236b16a2e3b45e2b5ade48fb6a3c0c

Revert "Googletest export": disallow empty prefix

This reverts commit 20b5b8ecc7a81d23b4716e22a2b35fd53379c8c6.
Reason for revert: Breaks existing applications, such as ANGLE
(angleproject.org), requires adding an extra prefix that needs to be
typed for no reason (when testing from command line) and increases the
logs' sizes by a non-trivial amount due to the very large number of
tests ANGLE runs.

Original commit message:

    Add a compile time check to ensure that the parameters to TEST_P and
    INSTANTIATE_TEST_SUITE_P are not empty. Some compilers already fail
    in that case and, even where it works, it's likely to result in
    technically invalid code by virtue of creating reserved identifiers:
    https://en.cppreference.com/w/cpp/language/identifiers

First, every project is perfectly capable of adding a prefix if they
want to support such a compiler. This change penalizes every
project.

Second, using a prefix such as `_p` also results in reserved
identifiers, so this change is not really solving the problem.  For that
matter, instead of generating `gtest_##prefix##...`, you can generate
`gtest_x##prefix##...` to correctly fix the issue, including when empty
prefixes are used.