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Cross-compiling OpenSSH for Android fails in getrrsetbyname.c

Posted by: admin November 1, 2017 Leave a comment

Questions:

I’m trying to cross-compile OpenSSH 7.6p1 for Android. It fails in getrrsetbyname.c. Here’s the clang-output for that file:

(cd openbsd-compat && /Applications/Xcode.app/Contents/Developer/usr/bin/make)
/Users/johannes/src/android_ssh/android_ndk_arm_api21/bin/clang -I/Users/johannes/src/android_ssh/prefix/include -pipe -Qunused-arguments -Wunknown-warning-option -Wall -Wpointer-arith -Wuninitialized -Wsign-compare -Wformat-security -Wsizeof-pointer-memaccess -Wno-pointer-sign -Wno-unused-result -fno-strict-aliasing -D_FORTIFY_SOURCE=2 -fno-builtin-memset -fstack-protector-strong   -I. -I.. -I. -I./.. -I~/src/android_ssh/prefix/include/openssl  -DHAVE_CONFIG_H -c getrrsetbyname.c
getrrsetbyname.c:219:12: error: incomplete definition of type 'struct state'
        if ((_resp->options & RES_INIT) == 0 && res_init() == -1) {
             ~~~~~^
getrrsetbyname.c:71:8: note: forward declaration of 'struct state'
struct __res_state _res;
       ^
../config.h:1785:21: note: expanded from macro '__res_state'
#define __res_state state
                    ^
getrrsetbyname.c:219:24: error: use of undeclared identifier 'RES_INIT'
        if ((_resp->options & RES_INIT) == 0 && res_init() == -1) {
                              ^
getrrsetbyname.c:71:20: error: tentative definition has type 'struct state' that is never completed
struct __res_state _res;
                   ^
getrrsetbyname.c:71:8: note: forward declaration of 'struct state'
struct __res_state _res;
       ^
../config.h:1785:21: note: expanded from macro '__res_state'
#define __res_state state
                    ^
3 errors generated.
make[1]: *** [getrrsetbyname.o] Error 1
make: *** [openbsd-compat/libopenbsd-compat.a] Error 2

So it’s missing a constant (RES_INIT) and a struct (struct __res_state) which are, at least on macOS and probably also on Linux, defined in the system resolv.h. However, the resolv.h in Android’s NDK doesn’t define those.

Am I missing something, or is getrssetbyname.c just not compatible in its current form with Android NDK?

Answers: