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.

1 files changed, 7 insertions, 5 deletions

diff --git a/src/pulsecore/core-util.c b/src/pulsecore/core-util.c
index 657e5008..96cf4e83 100644
--- 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;
 }