What does -fheinous-gnu-extensions option do?
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When Homebrew compiles libgcrypt on OS X, it patches it to use clang and add -std=gnu89 and -fheinous-gnu-extensions to the CFLAG Makefile var. What does the latter do?
GNU C has an extremely ugly extension whereby they silently ignore "noop" casts in places where an lvalue is required by an inline asm. We emulate this behavior when -fheinous-gnu-extensions is specified, but provide a strong guidance to not use it.
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