Remove HAVE_MPROTECT cmake check

Summary

The posix function mprotect() is defined in the header sys/mman.h. Instead of implementing a cmake check for the header and whether a c source file compiles, this MR uses __has_include(<sys/mman.h>) instead.

Note, the cmake variable HAVE_MPROTECT is not defined anymore. Also the config.h variables HAVE_MPROTECT and HAVE_SYS_MMAN_H are not defined anymore. They are used exclusively inside debugallocator.hh and thus (for backwards compatibility) defined there if the corresponding header is found.

added 1 commit

• 52dfb5bd - Add Changelog entry

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Summary

The posix function mprotect() is defined in the header sys/mman.h. Instead of implementing a cmake check for the header and whether a c source file compiles, this MR uses __has_include(<sys/mman.h>) instead.

Note, the cmake variable HAVE_MPROTECT is not defined anymore. Also the config.h variables HAVE_MPROTECT and HAVE_SYS_MMAN_H are not defined anymore. They are used exclusively inside debugallocator.hh and thus (for backwards compatibility) defined there if the corresponding header is found.

If I remember correctly, the problem was that the header is available on MacOS, but the mprotect is not usable.

mentioned in issue #199 (closed)

mentioned in issue #234 (closed)

resolved all threads

I am going to merge this next week, unless someone objects.

added 12 commits

• 52dfb5bd...ff9237b5 - 11 commits from branch master
• afd13745 - Remove HAVE_MPROTECT cmake check

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merged

mentioned in commit 1866e6cb