ThreadLocal class needs to be have default visibility.
Root cause is gtest uses typeinfo for the ThreadLocal class.
The problem manifests When gtest/gmock are built as a shared library
with libc++. When a class is used in typeinfo, it must have default
visibility.
There is an explanation about typeinfo and visibility here:
https://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/CppRuntimeEnv/Articles/SymbolVisibility.html
When libc++ is used with gtest in shared library mode, any tests
that are compiled with -fvisibility=hidden and exercise the
macro EXPECT_CALL, it results in an abort like:
[ FATAL ] /usr/include/gtest/internal/gtest-port.h:1394::
Condition typeid(*base) == typeid(Derived) failed.
This is because the typeinfo for ThreadLocal class is not visible.
Therefore, linker failed to match it to the shared library symbol, creating a
new symbol instead.
This fixes https://github.com/google/googletest/issues/1207.
TempDir() function is declared twice, once in `internal/gtest-port.h`
and a second time in `gtest.h`.
Fixes a warning with GCC when -Wredundant-decls is given.
instead of reading more like reversing the former "expected" and "actual"
roles of the LHS and RHS arguments.
This patch is manually applied from internal version (125109873)
It's not necessary, as the target_link_libraries command contains an
absolute path already, and the path given doesn't exist anymore,
leading only to linker warnings like:
ld: warning: directory not found for option
'-L/Users/travis/build/google/googletest/build/googlemock/gtest/src'
When using INSTANTIATE_TEST_CASE_P with a lambda function which uses
'info' as parameter name, GCC complains that this would shadow
parameter 'info' used in the macro's VA_ARGS call.
If the user's cmakelists.txt first look for threads using
find_package(Threads), then set(gtest_disable_pthreads ON),
and then include googletest. GoogleTest will not look for
threads. But since they have already been found before in
user's cmakelists, it will use them regardless.
This helped me fix build issue in darktable-org/rawspeed
on windows/MSYS2, even though there are threads, and they
are usable, googletest build was failing with issues
about AutoHandle. I was first looking for threads, and only
then including googletest, so no matter the value of
gtest_disable_pthreads, it failed.
The other obvious solution is for user to first include
googletest, and only then look for threads by himself.
