C11 atomics in some configurations (e.g. 64bit operations on ppc64 with
GCC) require linking to libatomic.
---
Testing welcome, especially in configurations where
* libatomic is not present
* libatomic is actually needed
---
configure | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index 1413122d87..1ff5dbee5b 100755
--- a/configure
+++ b/configure
@@ -6324,7 +6324,14 @@ check_headers asm/types.h
# it seems there are versions of clang in some distros that try to use the
# gcc headers, which explodes for stdatomic
# so we also check that atomics actually work here
-check_builtin stdatomic stdatomic.h "atomic_int foo, bar =
ATOMIC_VAR_INIT(-1); atomic_store(&foo, 0); foo += bar"
+#
+# some configurations also require linking to libatomic, so try
+# both with -latomic and without
+for LATOMIC in "-latomic" ""; do
+ check_builtin stdatomic stdatomic.h
\
+ "atomic_int foo, bar = ATOMIC_VAR_INIT(-1); atomic_store(&foo, 0); foo
+= bar" \
+ $LATOMIC && add_extralibs $LATOMIC && break
+done
check_lib advapi32 "windows.h" RegCloseKey -ladvapi32
check_lib bcrypt "windows.h bcrypt.h" BCryptGenRandom -lbcrypt &&
--
2.33.0
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