Bug#811620: FTBFS with GCC 6: cannot convert x to y

[Martin Michlmayr]

Package: xml-security-c
Version: 1.7.3-1
Severity: important
User: debian-gcc at lists.debian.org
Usertags: ftbfs-gcc-6 gcc-6-cannot-convert

This package fails to build with GCC 6.  GCC 6 has not been released
yet, but it's expected that GCC 6 will become the default compiler for
stretch.

Note that only the first error is reported; there might be more.  You
can find a snapshot of GCC 6 in experimental.  To build with GCC 6,
you can set CC=gcc-6 CXX=g++-6 explicitly.

> sbuild (Debian sbuild) 0.67.0 (26 Dec 2015) on dl580gen9-02.hlinux
...
> /bin/bash ../libtool  --tag=CXX   --mode=link g++  -Wall -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -O2 -DNDEBUG -pthread -DXSEC_LIBRARY_BUILD  -fPIE -pie -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o xsec-c14n tools/c14n/c14n.o libxml-security-c.la -lxerces-c -lm   -lssl -lcrypto
> libtool: link: g++ -Wall -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -O2 -DNDEBUG -pthread -DXSEC_LIBRARY_BUILD -fPIE -pie -Wl,-z -Wl,relro -Wl,-z -Wl,now -o .libs/xsec-c14n tools/c14n/c14n.o  -Wl,--as-needed ./.libs/libxml-security-c.so -lxerces-c -lm -lssl -lcrypto -pthread
> g++ -DHAVE_CONFIG_H -I. -I.. -I../xsec/framework  -I.. -Wdate-time -D_FORTIFY_SOURCE=2   -Wall -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -O2 -DNDEBUG -pthread -DXSEC_LIBRARY_BUILD -c -o tools/checksig/checksig.o tools/checksig/checksig.cpp
> In file included from ../xsec/enc/XSECCryptoProvider.hpp:42:0,
>                  from ../xsec/utils/XSECPlatformUtils.hpp:39,
>                  from ../xsec/utils/XSECDOMUtils.hpp:36,
>                  from ../xsec/dsig/DSIGKeyInfo.hpp:36,
>                  from ../xsec/dsig/DSIGKeyInfoList.hpp:35,
>                  from ../xsec/enc/XSECKeyInfoResolver.hpp:36,
>                  from tools/checksig/InteropResolver.hpp:35,
>                  from tools/checksig/checksig.cpp:30:
> ../xsec/enc/XSECCryptoSymmetricKey.hpp:188:52: warning: converting to non-pointer type 'unsigned int' from NULL [-Wconversion-null]
>                               unsigned int taglen = NULL) = 0;
>                                                     ^~~~
> 
> g++ -DHAVE_CONFIG_H -I. -I.. -I../xsec/framework  -I.. -Wdate-time -D_FORTIFY_SOURCE=2   -Wall -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -O2 -DNDEBUG -pthread -DXSEC_LIBRARY_BUILD -c -o tools/checksig/AnonymousResolver.o tools/checksig/AnonymousResolver.cpp
> In file included from ../xsec/enc/XSECCryptoProvider.hpp:42:0,
>                  from ../xsec/utils/XSECPlatformUtils.hpp:39,
>                  from ../xsec/utils/XSECDOMUtils.hpp:36,
>                  from tools/checksig/AnonymousResolver.cpp:36:
> ../xsec/enc/XSECCryptoSymmetricKey.hpp:188:52: warning: converting to non-pointer type 'unsigned int' from NULL [-Wconversion-null]
>                               unsigned int taglen = NULL) = 0;
>                                                     ^~~~
> 
> g++ -DHAVE_CONFIG_H -I. -I.. -I../xsec/framework  -I.. -Wdate-time -D_FORTIFY_SOURCE=2   -Wall -g -O2 -fPIE -fstack-protector-strong -Wformat -Werror=format-security -O2 -DNDEBUG -pthread -DXSEC_LIBRARY_BUILD -c -o tools/checksig/InteropResolver.o tools/checksig/InteropResolver.cpp
> In file included from ../xsec/enc/XSECCryptoProvider.hpp:42:0,
>                  from ../xsec/utils/XSECPlatformUtils.hpp:39,
>                  from ../xsec/utils/XSECDOMUtils.hpp:36,
>                  from ../xsec/dsig/DSIGKeyInfo.hpp:36,
>                  from ../xsec/dsig/DSIGKeyInfoList.hpp:35,
>                  from ../xsec/enc/XSECKeyInfoResolver.hpp:36,
>                  from tools/checksig/InteropResolver.hpp:35,
>                  from tools/checksig/InteropResolver.cpp:32:
> ../xsec/enc/XSECCryptoSymmetricKey.hpp:188:52: warning: converting to non-pointer type 'unsigned int' from NULL [-Wconversion-null]
>                               unsigned int taglen = NULL) = 0;
>                                                     ^~~~
> 
> tools/checksig/InteropResolver.cpp: In member function 'virtual XSECCryptoKey* InteropResolver::resolveKey(DSIGKeyInfoList*)':
> tools/checksig/InteropResolver.cpp:648:9: error: cannot convert 'bool' to 'XSECCryptoKey*' in return
>   return false;
>          ^~~~~
> 
> Makefile:2099: recipe for target 'tools/checksig/InteropResolver.o' failed
> make[3]: *** [tools/checksig/InteropResolver.o] Error 1

-- 
Martin Michlmayr
Linux for HPE Helion, Hewlett Packard Enterprise