pulsecore: Make run-from-build not readlink() on every call

Since this is no longer only defined in debug builds, let's make sure
that there is no impact if this is indavertently called repeatedly at
startup.

diff --git a/src/pulsecore/core-util.c b/src/pulsecore/core-util.c
index 657e50085c783556b26c08f4ead8c3523f438c9b..96cf4e837bee9725b0f3f15017ac420ce1f62887 100644 (file)
--- a/src/pulsecore/core-util.c
+++ b/src/pulsecore/core-util.c
@@ -3209,12 +3209,14 @@ void pa_reset_personality(void) {
 
 pa_bool_t pa_run_from_build_tree(void) {
     char *rp;
-    pa_bool_t b = FALSE;
+    static pa_bool_t b = FALSE;
 
-    if ((rp = pa_readlink("/proc/self/exe"))) {
-        b = pa_startswith(rp, PA_BUILDDIR);
-        pa_xfree(rp);
-    }
+    PA_ONCE_BEGIN {
+        if ((rp = pa_readlink("/proc/self/exe"))) {
+            b = pa_startswith(rp, PA_BUILDDIR);
+            pa_xfree(rp);
+        }
+    } PA_ONCE_END;
 
     return b;
 }