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The iface_test_bld gets the excludedFromAll include directory with "-isystem" because it is added indirectly through an imported target. On AIX with GCC the -isystem flag causes sources to be preprocessed as: # 3 "/.../excludedFromAll.h" 2 3 4 The flags after the file name are documented here: https://gcc.gnu.org/onlinedocs/cpp/Preprocessor-Output.html and the "4" flag says that following content is extern "C". This causes the excludedFromAll function to be declared as a C symbol and not mangled for C++, which fails to link later because the symbol is really provided as C++. Work around this by setting the NO_SYSTEM_FROM_IMPORTED target property on iface_test_bld. Somehow iface_test_exp does not end up with -isystem so we do not need this workaround for that target.
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