configure: check whether std::atomic<T> works for function pointers

And ask the user to apply one of the patches we're carrying to their
Standard Libraries.

Change-Id: I7e6338336dd6468ead24ffff141139c79056922e
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 8 insertions, 0 deletions

diff --git a/configure b/configure
index 049d393e7f..29b228f5bb 100755
--- a/configure
+++ b/configure
@@ -4486,6 +4486,14 @@ else
     CFG_ATOMIC64=no
 fi
 
+# Detect whether std::atomic works for function pointers -- some implementations are buggy
+if ! compileTest common/atomicfptr "std::atomic for function pointers"; then
+    echo "ERROR: detected a std::atomic implementation that fails for function pointers."
+    echo "Please apply the patch corresponding to your Standard Library vendor, found in"
+    echo "  $relpath/config.tests/common/atomicfptr"
+    exit 101
+fi
+
 # detect sse2 support
 CFG_SSE_LIST=
 if [ "${CFG_SSE2}" = "auto" ]; then