[Pan-devel] compile error from current git master head

[Jack]

Hello all,

Based on some of the posts from a month ago, I decided to try again to  
get pan to compile for me - using the most recent tarball, and some of  
the MRs specifically addressing compile issues.  After not getting very  
far, and having the errors just seem to be more of those the MR I was  
testing was trying to resolve, I looked again more carefully at the  
repository, and noticed that there has actually been a good bit of  
recent activity, committing many of those MRs.  So, I just git cloned  
the repository and using slight adjustment to the ./configure line I  
had previously used, I still get a compile error:

make[3]: Entering directory  
'/usr/local/src/pan/pan/build/pan/usenet-utils'
x86_64-pc-linux-gnu-g++ -DHAVE_CONFIG_H -I. -I../../../pan/usenet-utils  
-I../..  -I../../.. -I/usr/include/gmime-3.0 -D_LARGEFILE64_SOURCE  
-I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include  
-I/usr/lib64/libffi/include -pthread -I/usr/include/libmount  
-I/usr/include/blkid  -I/usr/include/glib-2.0  
-I/usr/lib64/glib-2.0/include   
-DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_26  
-DGLIB_VERSION_MAX_ALLOWED=G_ENCODE_VERSION\(2,36\)    -g -O2 -c -o  
mime-utils.o ../../../pan/usenet-utils/mime-utils.cc
../../../pan/usenet-utils/mime-utils.cc: In function 'GMimeMessage*  
pan::message_add_signed_part(const string&, const string&,  
GMimeMessage*)':
../../../pan/usenet-utils/mime-utils.cc:1752:72: error: ordered  
comparison of pointer with integer zero ('GMimeMultipartSigned*' {aka  
'_GMimeMultipartSigned*'} and 'int')
 1752 |     if (g_mime_multipart_signed_sign (gpg_ctx, gmo,  
uid.c_str(), &err) <0)
      |          
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
../../../pan/usenet-utils/mime-utils.cc: In function 'bool  
pan::gpg_encrypt(const string&, const string&, GMimeMessage*,  
GPtrArray*, bool)':
../../../pan/usenet-utils/mime-utils.cc:1787:75: error: ordered  
comparison of pointer with integer zero ('GMimeMultipartEncrypted*'  
{aka '_GMimeMultipartEncrypted*'} and 'int')
 1786 |     if (g_mime_multipart_encrypted_encrypt(gpg_ctx,  
GMIME_OBJECT (part), sign, uid.c_str(),
      |          
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1787 |                                            GMIME_ENCRYPT_NONE,  
rcp, &err) < 0)
      |                                             
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
make[3]: *** [Makefile:454: mime-utils.o] Error 1

I initially wondered if this was due to my use of gcc  11.2.0, but   
switching back to 10.3.0 gave me a different error:

undefined reference to `std::__throw_bad_array_new_length()'

(Sorry I didn't copy more of the context.)  I was able to fix this by  
prepending "CXXFLAGS=-std=c++14" to the configure line.  Compiled like  
this, pan installs and runs, although my testing has been only minimal.

Thinking further, I wonder if I'd end up with this second error with  
gcc11, if I could get past the first errors.

My best guess (without really understanding the code is that the result  
of the call to g_mime_multipart_signed_sign is a pointer, so the  
comparison will have to be changed - but I have no idea whether  !=  
NULL have the same result as the original < 0.

Thanks for any suggestions.

Jack