Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r2857:018427a42764
Date: 2017-01-13 11:02 +0100
http://bitbucket.org/cffi/cffi/changeset/018427a42764/
Log: Use __sync_synchronize() only if setup.py detects we have it. Fix
for people using an incredibly old gcc.
diff --git a/c/call_python.c b/c/call_python.c
--- a/c/call_python.c
+++ b/c/call_python.c
@@ -177,7 +177,7 @@
#if (defined(WITH_THREAD) && !defined(_MSC_VER) && \
!defined(__amd64__) && !defined(__x86_64__) && \
!defined(__i386__) && !defined(__i386))
-# if defined(__GNUC__)
+# if defined(HAVE_SYNC_SYNCHRONIZE)
# define read_barrier() __sync_synchronize()
# elif defined(_AIX)
# define read_barrier() __lwsync()
diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -69,7 +69,22 @@
if not ok1:
no_working_compiler_found()
sys.stderr.write("Note: will not use '__thread' in the C code\n")
- sys.stderr.write("The above error message can be safely ignored\n")
+ _safe_to_ignore()
+
+def ask_supports_sync_synchronize():
+ if sys.platform == 'win32':
+ return
+ config = get_config()
+ ok = config.try_link('int main(void) { __sync_synchronize(); return 0; }')
+ if ok:
+ define_macros.append(('HAVE_SYNC_SYNCHRONIZE', None))
+ else:
+ sys.stderr.write("Note: will not use '__sync_synchronize()'"
+ " in the C code\n")
+ _safe_to_ignore()
+
+def _safe_to_ignore():
+ sys.stderr.write("***** The above error message can be safely
ignored.\n\n")
def uses_msvc():
config = get_config()
@@ -118,6 +133,7 @@
else:
use_pkg_config()
ask_supports_thread()
+ ask_supports_sync_synchronize()
if 'freebsd' in sys.platform:
include_dirs.append('/usr/local/include')
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