building libpng-1.6.29 fails with error in signal.h
Marco Atzeri
marco.atzeri@gmail.com
Tue Jul 4 20:47:00 GMT 2017
On 04/07/2017 20:59, Denis Excoffier wrote:
> Hello,
>
> I tried to compile libpng-1.6.29 and failed at first. I obtain:
>
> /tmp/lcl/uxl/make/bin/make all-am
> make[1]: Entering directory '/cygdrive/D/Users/dexcoff1/dexcoff1/cyglcl/tmp/libpng/libpng-1.6.29'
> depbase=`echo png.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\
> /bin/sh ./libtool --tag=CC --mode=compile gcc -DHAVE_CONFIG_H -I. -g -O2 -MT png.lo -MD -MP -MF $depbase.Tpo -c -o png.lo png.c &&\
> mv -f $depbase.Tpo $depbase.Plo
> libtool: compile: gcc -DHAVE_CONFIG_H -I. -g -O2 -MT png.lo -MD -MP -MF .deps/png.Tpo -c png.c -DDLL_EXPORT -DPIC -o .libs/png.o
> In file included from /usr/include/sys/signal.h:22:0,
> from /usr/include/signal.h:6,
> from /usr/include/machine/setjmp.h:372,
> from /usr/include/setjmp.h:10,
> from pngconf.h:50,
> from png.h:366,
> from pngpriv.h:375,
> from png.c:14:
> /usr/include/cygwin/signal.h:328:34: error: unknown type name 'siginfo_t'
> void (*sa_sigaction) ( int, siginfo_t *, void * );
> ^
> make[1]: *** [Makefile:1174: png.lo] Error 1
> make[1]: Leaving directory '/cygdrive/D/Users/dexcoff1/dexcoff1/cyglcl/tmp/libpng/libpng-1.6.29'
> make: *** [Makefile:791: all] Error 2
>
>
> I really don't know which (signal.h or libpng) is okay (or none). Will someone investigate this?
>
> Regards,
>
> Denis Excoffier.
>
tested on 1.6.30
./configure CFLAGS="-D_GNU_SOURCE"
make
works.
Reading
http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/signal.h.html
I have the impression that the current cygwin header behaviour
is correct as siginfo_t is an extension POSIX.1-2008.
In theory "_GNU_SOURCE" should be defined by default, but I see
$ grep SOURCE *.h
pngpriv.h:#define _POSIX_SOURCE 1 /* Just the POSIX 1003.1 and C89 APIs */
$ grep SOURCE *.c
pngtest.c:#define _POSIX_SOURCE 1
that could have reduced the scope.
Regards
Marco
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