getaddrinfo on MinGW

[Ludovic Courtès]

Hello,

The ‘getaddrinfo’ module doesn’t seem to work as advertised ;-) when
cross-building for MinGW.

>From <http://hydra.nixos.org/build/1140382>, a file that includes
Gnulib’s <netdb.h> fails to build like this:

--8<---------------cut here---------------start------------->8---
/bin/sh ../libtool  --tag=CC   --mode=compile i686-pc-mingw32-gcc 
-DHAVE_CONFIG_H   -DBUILDING_LIBGUILE=1 -I../../guile-2.0.1.154-f3977 -I.. 
-I../../guile-2.0.1.154-f3977/lib -I../lib 
-I/nix/store/hwd5i31rikwdjmjhxn4d2xwlsxczsg0s-libffi-3.0.9-i686-pc-mingw32/lib/libffi-3.0.9/include
   
-I/nix/store/lqyvgsv21wmf15xnznwv5qi78p59zkfm-libunistring-0.9.3-i686-pc-mingw32/include
 -Wall -Wmissing-prototypes -Wdeclaration-after-statement -Wswitch-enum 
-fvisibility=hidden 
-I/nix/store/lli7w1b3kc5nwdwgq9c9ikhdx141bba4-boehm-gc-7.2pre20110122-i686-pc-mingw32/include
   -g -O2 -c -o net_db.lo ../../guile-2.0.1.154-f3977/libguile/net_db.c
libtool: compile:  i686-pc-mingw32-gcc -DHAVE_CONFIG_H -DBUILDING_LIBGUILE=1 
-I../../guile-2.0.1.154-f3977 -I.. -I../../guile-2.0.1.154-f3977/lib -I../lib 
-I/nix/store/hwd5i31rikwdjmjhxn4d2xwlsxczsg0s-libffi-3.0.9-i686-pc-mingw32/lib/libffi-3.0.9/include
 
-I/nix/store/lqyvgsv21wmf15xnznwv5qi78p59zkfm-libunistring-0.9.3-i686-pc-mingw32/include
 -Wall -Wmissing-prototypes -Wdeclaration-after-statement -Wswitch-enum 
-fvisibility=hidden 
-I/nix/store/lli7w1b3kc5nwdwgq9c9ikhdx141bba4-boehm-gc-7.2pre20110122-i686-pc-mingw32/include
 -g -O2 -c ../../guile-2.0.1.154-f3977/libguile/net_db.c -o net_db.o
../../guile-2.0.1.154-f3977/libguile/net_db.c:460:1: error: 'AI_ALL' undeclared 
here (not in a function)
../../guile-2.0.1.154-f3977/libguile/net_db.c:460:1: error: bit-field 
'_gl_verify_error_if_negative' width not an integer constant
../../guile-2.0.1.154-f3977/libguile/net_db.c:482:33: warning: 'struct 
addrinfo' declared inside parameter list
../../guile-2.0.1.154-f3977/libguile/net_db.c:482:33: warning: its scope is 
only this definition or declaration, which is probably not what you want
../../guile-2.0.1.154-f3977/libguile/net_db.c: In function 'scm_from_addrinfo':
../../guile-2.0.1.154-f3977/libguile/net_db.c:490:3: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c:491:3: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c:492:3: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c:493:3: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c:494:3: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c:494:3: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c:496:3: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c:496:3: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c: In function 'scm_getaddrinfo':
../../guile-2.0.1.154-f3977/libguile/net_db.c:614:19: error: storage size of 
'c_hints' isn't known
../../guile-2.0.1.154-f3977/libguile/net_db.c:657:3: warning: implicit 
declaration of function 'getaddrinfo'
../../guile-2.0.1.154-f3977/libguile/net_db.c:665:10: error: dereferencing 
pointer to incomplete type
../../guile-2.0.1.154-f3977/libguile/net_db.c:665:19: warning: left-hand 
operand of comma expression has no effect
../../guile-2.0.1.154-f3977/libguile/net_db.c:666:2: warning: passing argument 
1 of 'scm_from_addrinfo' from incompatible pointer type
../../guile-2.0.1.154-f3977/libguile/net_db.c:482:1: note: expected 'const 
struct addrinfo *' but argument is of type 'struct addrinfo *'
../../guile-2.0.1.154-f3977/libguile/net_db.c:668:7: warning: implicit 
declaration of function 'freeaddrinfo'
../../guile-2.0.1.154-f3977/libguile/net_db.c:614:19: warning: unused variable 
'c_hints'
../../guile-2.0.1.154-f3977/libguile/net_db.c: At top level:
../../guile-2.0.1.154-f3977/libguile/net_db.c:680:1: error: 'EAI_BADFLAGS' 
undeclared here (not in a function)
../../guile-2.0.1.154-f3977/libguile/net_db.c:680:1: error: bit-field 
'_gl_verify_error_if_negative' width not an integer constant
../../guile-2.0.1.154-f3977/libguile/net_db.c: In function 'scm_gai_strerror':
../../guile-2.0.1.154-f3977/libguile/net_db.c:744:3: warning: implicit 
declaration of function 'gai_strerror'
../../guile-2.0.1.154-f3977/libguile/net_db.c:744:3: warning: passing argument 
1 of 'scm_from_locale_string' makes pointer from integer without a cast
../../guile-2.0.1.154-f3977/libguile/strings.h:134:13: note: expected 'const 
char *' but argument is of type 'int'
--8<---------------cut here---------------end--------------->8---

Clearly the AI_ constants and ‘struct addrinfo’ aren’t defined by
<netdb.h>.

The relevant part of the ‘configure’ output is [0]:

--8<---------------cut here---------------start------------->8---
checking whether getaddrinfo is declared without a macro... no
checking whether freeaddrinfo is declared without a macro... no
checking whether gai_strerror is declared without a macro... no
checking whether getnameinfo is declared without a macro... no

[...]

configure: checking how to do getaddrinfo, freeaddrinfo and getnameinfo
checking for library containing getaddrinfo... no
checking for getaddrinfo... no
checking for getaddrinfo in ws2tcpip.h and -lws2_32... no
checking whether gai_strerror is declared... yes
checking whether gai_strerrorA is declared... yes
checking for gai_strerror with POSIX signature... no
checking for struct sockaddr.sa_len... no
checking whether getaddrinfo is declared... no
checking whether freeaddrinfo is declared... no
checking whether getnameinfo is declared... no
checking for struct addrinfo... yes
--8<---------------cut here---------------end--------------->8---

‘struct addrinfo’ is found in <ws2tcpip.h>, so netdb.h should include it
when its available, I guess.

As for the AI_ and EAI_ constants, I don’t understand why they’re not
being defined [1].

Ideas?

Thanks,
Ludo’.

[0] http://hydra.nixos.org/build/1140382/log/raw

[1] See the generated files at:

    
http://hydra.nixos.org/build/1140382/download/1/nix-build-lcd1hjcnfv28rmiwn829wiwhaxdyybc3-guile-2.0.1.154-f3977-i686-pc-mingw32.drv-0/build/config.log
    
http://hydra.nixos.org/build/1140382/download/1/nix-build-lcd1hjcnfv28rmiwn829wiwhaxdyybc3-guile-2.0.1.154-f3977-i686-pc-mingw32.drv-0/build/lib/netdb.h