meson, configure: move keyctl test to meson

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -322,7 +322,6 @@ trace_file="trace"
 coroutine=""
 tls_priority="NORMAL"
 plugins="$default_feature"
-secret_keyring="$default_feature"
 meson=""
 meson_args=""
 ninja=""
@@ -1009,10 +1008,6 @@ for opt do
   ;;
   --gdb=*) gdb_bin="$optarg"
   ;;
-  --enable-keyring) secret_keyring="yes"
-  ;;
-  --disable-keyring) secret_keyring="no"
-  ;;
   --enable-gio) gio=yes
   ;;
   --disable-gio) gio=no
@@ -2440,41 +2435,6 @@ case "$slirp" in
     ;;
 esac
 
-##########################################
-# check for usable __NR_keyctl syscall
-
-if test "$linux" = "yes" ; then
-
-    have_keyring=no
-    cat > $TMPC << EOF
-#include <errno.h>
-#include <asm/unistd.h>
-#include <linux/keyctl.h>
-#include <unistd.h>
-int main(void) {
-    return syscall(__NR_keyctl, KEYCTL_READ, 0, NULL, NULL, 0);
-}
-EOF
-    if compile_prog "" "" ; then
-        have_keyring=yes
-    fi
-fi
-if test "$secret_keyring" != "no"
-then
-    if test "$have_keyring" = "yes"
-    then
-	secret_keyring=yes
-    else
-	if test "$secret_keyring" = "yes"
-	then
-	    error_exit "syscall __NR_keyctl requested, \
-but not implemented on your system"
-	else
-	    secret_keyring=no
-	fi
-    fi
-fi
-
 ##########################################
 # End of CC checks
 # After here, no more $cc or $ld runs
@@ -2760,10 +2720,6 @@ if test -n "$gdb_bin"; then
     fi
 fi
 
-if test "$secret_keyring" = "yes" ; then
-  echo "CONFIG_SECRET_KEYRING=y" >> $config_host_mak
-fi
-
 echo "ROMS=$roms" >> $config_host_mak
 echo "MAKE=$make" >> $config_host_mak
 echo "PYTHON=$python" >> $config_host_mak

crypto/meson.build

@@ -34,7 +34,9 @@ else
   crypto_ss.add(files('hash-glib.c', 'hmac-glib.c', 'pbkdf-stub.c'))
 endif
 
-crypto_ss.add(when: 'CONFIG_SECRET_KEYRING', if_true: files('secret_keyring.c'))
+if have_keyring
+  crypto_ss.add(files('secret_keyring.c'))
+endif
 if have_afalg
   crypto_ss.add(if_true: files('afalg.c', 'cipher-afalg.c', 'hash-afalg.c'))
 endif

meson.build

@@ -1940,6 +1940,19 @@ config_host_data.set('CONFIG_GETAUXVAL', cc.links(gnu_source_prefix + '''
     return getauxval(AT_HWCAP) == 0;
   }'''))
 
+have_keyring = get_option('keyring') \
+  .require(targetos == 'linux', error_message: 'keyring is only available on Linux') \
+  .require(cc.compiles('''
+    #include <errno.h>
+    #include <asm/unistd.h>
+    #include <linux/keyctl.h>
+    #include <sys/syscall.h>
+    #include <unistd.h>
+    int main(void) {
+        return syscall(__NR_keyctl, KEYCTL_READ, 0, NULL, NULL, 0);
+    }'''), error_message: 'keyctl syscall not available on this system').allowed()
+config_host_data.set('CONFIG_SECRET_KEYRING', have_keyring)
+
 have_cpuid_h = cc.links('''
   #include <cpuid.h>
   int main(void) {
@@ -3698,7 +3711,7 @@ if nettle.found()
 endif
 summary_info += {'AF_ALG support':    have_afalg}
 summary_info += {'rng-none':          get_option('rng_none')}
-summary_info += {'Linux keyring':     config_host.has_key('CONFIG_SECRET_KEYRING')}
+summary_info += {'Linux keyring':     have_keyring}
 summary(summary_info, bool_yn: true, section: 'Crypto')
 
 # Libraries

meson_options.txt

@@ -90,6 +90,8 @@ option('avx2', type: 'feature', value: 'auto',
        description: 'AVX2 optimizations')
 option('avx512f', type: 'feature', value: 'disabled',
        description: 'AVX512F optimizations')
+option('keyring', type: 'feature', value: 'auto',
+       description: 'Linux keyring support')
 
 option('attr', type : 'feature', value : 'auto',
        description: 'attr/xattr support')

scripts/meson-buildoptions.sh

@@ -68,6 +68,7 @@ meson_options_help() {
   printf "%s\n" '  hvf             HVF acceleration support'
   printf "%s\n" '  iconv           Font glyph conversion support'
   printf "%s\n" '  jack            JACK sound support'
+  printf "%s\n" '  keyring         Linux keyring support'
   printf "%s\n" '  kvm             KVM acceleration support'
   printf "%s\n" '  l2tpv3          l2tpv3 network backend support'
   printf "%s\n" '  libdaxctl       libdaxctl support'
@@ -229,6 +230,8 @@ _meson_option_parse() {
     --disable-install-blobs) printf "%s" -Dinstall_blobs=false ;;
     --enable-jack) printf "%s" -Djack=enabled ;;
     --disable-jack) printf "%s" -Djack=disabled ;;
+    --enable-keyring) printf "%s" -Dkeyring=enabled ;;
+    --disable-keyring) printf "%s" -Dkeyring=disabled ;;
     --enable-kvm) printf "%s" -Dkvm=enabled ;;
     --disable-kvm) printf "%s" -Dkvm=disabled ;;
     --enable-l2tpv3) printf "%s" -Dl2tpv3=enabled ;;