crypto: fix build with gcrypt enabled

If nettle is disabled and gcrypt enabled, the compiler and linker flags
needed for gcrypt are not passed.

Gnutls was also not added as a dependancy when gcrypt is enabled.

Attempting to add the library dependencies at the same time as the
source dependencies is error prone, as there are alot of different
rules for picking which sources to use, and some of the source files
use code level conditionals intead. It is thus clearer to add the
library dependencies separately.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200901133050.381844-2-berrange@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

configure

@@ -6963,6 +6963,8 @@ if test "$gcrypt" = "yes" ; then
   if test "$gcrypt_hmac" = "yes" ; then
     echo "CONFIG_GCRYPT_HMAC=y" >> $config_host_mak
   fi
+  echo "GCRYPT_CFLAGS=$gcrypt_cflags" >> $config_host_mak
+  echo "GCRYPT_LIBS=$gcrypt_libs" >> $config_host_mak
 fi
 if test "$nettle" = "yes" ; then
   echo "CONFIG_NETTLE=y" >> $config_host_mak

crypto/meson.build

@@ -23,24 +23,35 @@ crypto_ss.add(files(
   'tlssession.c',
 ))
 
-if 'CONFIG_GCRYPT' in config_host
-  wo_nettle = files('hash-gcrypt.c', 'pbkdf-gcrypt.c')
+if 'CONFIG_NETTLE' in config_host
+  crypto_ss.add(files('hash-nettle.c', 'hmac-nettle.c', 'pbkdf-nettle.c'))
+elif 'CONFIG_GCRYPT' in config_host
+  crypto_ss.add(files('hash-gcrypt.c', 'pbkdf-gcrypt.c'))
+  if 'CONFIG_GCRYPT_HMAC' in config_host
+    crypto_ss.add(files('hmac-gcrypt.c'))
+  else
+    crypto_ss.add(files('hmac-glib.c'))
+  endif
 else
-  wo_nettle = files('hash-glib.c', 'pbkdf-stub.c')
-endif
-if 'CONFIG_GCRYPT_HMAC' not in config_host
-  wo_nettle += files('hmac-glib.c')
+  crypto_ss.add(files('hash-glib.c', 'hmac-glib.c', 'pbkdf-stub.c'))
 endif
-crypto_ss.add(when: [nettle, 'CONFIG_NETTLE'],
-             if_true: files('hash-nettle.c', 'hmac-nettle.c', 'pbkdf-nettle.c'),
-             if_false: wo_nettle)
 
 crypto_ss.add(when: 'CONFIG_SECRET_KEYRING', if_true: files('secret_keyring.c'))
 crypto_ss.add(when: 'CONFIG_QEMU_PRIVATE_XTS', if_true: files('xts.c'))
-crypto_ss.add(when: 'CONFIG_GCRYPT_HMAC', if_true: files('hmac-gcrypt.c'))
 crypto_ss.add(when: 'CONFIG_AF_ALG', if_true: files('afalg.c', 'cipher-afalg.c', 'hash-afalg.c'))
 crypto_ss.add(when: 'CONFIG_GNUTLS', if_true: files('tls-cipher-suites.c'))
 
+if 'CONFIG_NETTLE' in config_host
+  crypto_ss.add(nettle)
+elif 'CONFIG_GCRYPT' in config_host
+  crypto_ss.add(gcrypt)
+endif
+
+if 'CONFIG_GNUTLS' in config_host
+  crypto_ss.add(gnutls)
+endif
+
+
 crypto_ss = crypto_ss.apply(config_host, strict: false)
 libcrypto = static_library('crypto', crypto_ss.sources() + genh,
                            dependencies: [crypto_ss.dependencies()],
@@ -52,12 +63,21 @@ crypto = declare_dependency(link_whole: libcrypto,
 
 util_ss.add(files('aes.c'))
 util_ss.add(files('init.c'))
+
 if 'CONFIG_GCRYPT' in config_host
   util_ss.add(files('random-gcrypt.c'))
 elif 'CONFIG_GNUTLS' in config_host
-  util_ss.add(files('random-gnutls.c'), gnutls)
+  util_ss.add(files('random-gnutls.c'))
 elif 'CONFIG_RNG_NONE' in config_host
   util_ss.add(files('random-none.c'))
 else
   util_ss.add(files('random-platform.c'))
 endif
+
+if 'CONFIG_GCRYPT' in config_host
+  util_ss.add(gcrypt)
+endif
+
+if 'CONFIG_GNUTLS' in config_host
+  util_ss.add(gnutls)
+endif

meson.build

@@ -116,6 +116,11 @@ urcubp = not_found
 if 'CONFIG_TRACE_UST' in config_host
   urcubp = declare_dependency(link_args: config_host['URCU_BP_LIBS'].split())
 endif
+gcrypt = not_found
+if 'CONFIG_GCRYPT' in config_host
+  gcrypt = declare_dependency(compile_args: config_host['GCRYPT_CFLAGS'].split(),
+                              link_args: config_host['GCRYPT_LIBS'].split())
+endif
 nettle = not_found
 if 'CONFIG_NETTLE' in config_host
   nettle = declare_dependency(compile_args: config_host['NETTLE_CFLAGS'].split(),