[CMake] How to fix the following based on CMP0053 policy

[Scott Bloom]

I have an older 3rd party (that is no longer supported) cmake file, that relies on the CMP0053 OLD setting

Since I have moved to 3.12, Im getting the warning that its deprecated etc...

SC_CHECK_BROKEN_FUNC(
  strstr "
                extern int strstr();
                exit(strstr(\"\\\0test\", \"test\") ? 1 : 0);"
  )


However, when I turn the policy to "NEW" it errors out with
Syntax error in cmake code at  when parsing string
        extern int strstr();

        exit(strstr(\"\\\0test\", \"test\") ? 1 : 0);

  Invalid character escape '\0'.


However, that is the whole test, ie that the escaped 0 check works.

How should I change the strings generation so it works with the new policy?

Scott
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