Ignore -Wcast-function-type warning

[babeltrace.git] / configure.ac

diff --git a/configure.ac b/configure.ac
index c8012d91e0fb0f286a733403eb6ba49a13e9c02c..b2493566c5b422ad94ba751cc9c617e342f56e7a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -671,9 +671,21 @@ AX_COMPILER_FLAGS(
                -Wno-packed dnl
                -Wno-pointer-arith dnl
                -Wno-format-nonliteral dnl
-               -Wno-undef dnl
                -Wno-double-promotion dnl
                -Wno-cast-align dnl
+               dnl
+               dnl Some versions of SWIG (like 3.0.12) generate code that produces
+               dnl -Wcast-function-type warnings.  This warning is present in gcc >= 8.  This
+               dnl combo happens on RHEL/Centos 8, for example.  Later versions of SWIG (like
+               dnl 4.0.1) have the correct function signatures to not produce this warning.
+               dnl It's simpler to just disable the warning globally.
+               dnl
+               dnl Note that the Debian/Ubuntu SWIG package 3.0.12-2 contains a local patch to
+               dnl fix this (python-fix-function-cast-warnings.patch), so you won't be able to
+               dnl reproduce the warning using that package.
+               dnl
+               dnl Ref: https://github.com/swig/swig/issues/1259
+               -Wno-cast-function-type dnl
        ])
 
 # CFLAGS from AX_COMPILER_FLAGS.