configure, meson: move membarrier test to meson

The test is a bit different from the others, in that it does not run
if $membarrier is empty.  For meson, the default can simply be disabled;
if one day we will toggle the default, no change is needed in meson.build.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/meson.build b/meson.build
index 7a262051b7..6dc38a7916 100644
--- a/meson.build
+++ b/meson.build
@@ -1808,6 +1808,26 @@ config_host_data.set('CONFIG_AVX512F_OPT', get_option('avx512f') \
     int main(int argc, char *argv[]) { return bar(argv[0]); }
   '''), error_message: 'AVX512F not available').allowed())
 
+if get_option('membarrier').disabled()
+  have_membarrier = false
+elif targetos == 'windows'
+  have_membarrier = true
+elif targetos == 'linux'
+  have_membarrier = cc.compiles('''
+    #include <linux/membarrier.h>
+    #include <sys/syscall.h>
+    #include <unistd.h>
+    #include <stdlib.h>
+    int main(void) {
+        syscall(__NR_membarrier, MEMBARRIER_CMD_QUERY, 0);
+        syscall(__NR_membarrier, MEMBARRIER_CMD_SHARED, 0);
+        exit(0);
+    }''')
+endif
+config_host_data.set('CONFIG_MEMBARRIER', get_option('membarrier') \
+  .require(have_membarrier, error_message: 'membarrier system call not available') \
+  .allowed())
+
 config_host_data.set('CONFIG_AF_VSOCK', cc.compiles(gnu_source_prefix + '''
   #include <errno.h>
   #include <sys/types.h>
@@ -3331,7 +3351,7 @@ summary_info += {'link-time optimization (LTO)': get_option('b_lto')}
 summary_info += {'PIE':               get_option('b_pie')}
 summary_info += {'static build':      config_host.has_key('CONFIG_STATIC')}
 summary_info += {'malloc trim support': has_malloc_trim}
-summary_info += {'membarrier':        config_host.has_key('CONFIG_MEMBARRIER')}
+summary_info += {'membarrier':        have_membarrier}
 summary_info += {'debug stack usage': config_host.has_key('CONFIG_DEBUG_STACK_USAGE')}
 summary_info += {'mutex debugging':   config_host.has_key('CONFIG_DEBUG_MUTEX')}
 summary_info += {'memory allocator':  get_option('malloc')}