[RFC] cygport: use -Werror=implicit-function-declarations
Wed Oct 16 23:42:00 GMT 2013
One of the more common causes of SEGVs with x86_64-cygwin packages
occurs when an implicit function declaration causes an assumption that
all arguments and the return value are of type 'int' (32 bits) where
some or all of these are longs or pointers (64 bits on x86_64). One way
of avoiding such errors is to add -Werror=implicit-function-declarations
to the default CFLAGS/OBJCFLAGS, and in my brief testing to date, this
has already caught a number of cases where this would have broken the
package on x86_64.
One potential drawback is that this flag may cause false negatives in
poorly written configure tests; without extensive testing, I can't say
yet how prevalent this would be, but I think that making this an error
and perusing config.log is generally easier than making it just a
warning and having to sift through the entire output of make.
My proposed patch for cygport git master is attached. Any thoughts?
And are there any other warning flags which cause similar errors on
x86_64 that should be added as well?
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