GCC and LD Hardening Flags

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Hi All,

I generally use flags and switches very similar to Debian's hardening
script [1]. The flags and switches include:

* -Wall -Wextra
* -DSAFEINT_DISALLOW_UNSIGNED_NEGATION (LeBlanc's SafeInt class)
* -Wformat=2 -Wformat-security
* -D_FORTIFY_SOURCE=2 (debug builds)
*  -D_GLIBCXX_DEBUG (debug builds)
* -fstack-protector
* -Wl,-z,now (perform all fixups immediately)
* -Wl,-z,relro (read only GOT)
* -fPIE (ASLR on an executable)

Are there any other switches which others find useful or improve a posture?

[1] http://anonscm.debian.org/viewvc/hardening/hardening-wrapper/debian/README.Debian?revision=114&view=markup


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