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

On 04/07/2017 20:59, Denis Excoffier wrote:

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?


Denis Excoffier.

tested on 1.6.30

  ./configure CFLAGS="-D_GNU_SOURCE"



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.


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