[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