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Re: building libpng-1.6.29 fails with error in signal.h

On 2017-07-04 15:46, Marco Atzeri wrote:
On 04/07/2017 20:59, Denis Excoffier wrote:
I tried to compile libpng-1.6.29 and failed at first. I obtain:

/usr/include/cygwin/signal.h:328:34: error: unknown type name 'siginfo_t'
     void  (*sa_sigaction) ( int, siginfo_t *, void * );
I really don't know which (signal.h or libpng) is okay (or none). Will someone investigate this?
> Reading

I have the impression that the current cygwin header behaviour
is correct as siginfo_t is an extension POSIX.1-2008.

True, but I missed that struct sigaction (which is correctly guarded as POSIX.1-1990) uses siginfo_t. This part needs to be guarded as POSIX.1b-1993 without breaking the struct, as is done in glibc.

In theory "_GNU_SOURCE" should be defined by default

No, I'll fix this in the header shortly, along with updating libpng.


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