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8370a35d4b
When running test-case gdb.linespec/cpls-abi-tag.exp with gcc 4.8.4, we run
into:
...
cpls-abi-tag.cc:71:26: error: ‘abi_tag’ attribute applied to non-function ‘s’
ABI3 test_abi_tag_struct s;
^
...
The test-case is supported starting gcc 5.
Fix this by requiring gcc >= 5, if a gcc compiler is used.
Tested on x86_64-linux.