build-sys: make "incomatible pointer types" warnings fatal (#5459)

This isn't something that can be safely ignored, and easy to miss. This
prevents errors like issue #5452.

diff --git a/configure.ac b/configure.ac
index d98cc4d9bad4d538f512bc1c7f7193b7c9093571..3835413ad59e4412687ee53059c89f0131a6aa1a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -167,6 +167,7 @@ CC_CHECK_FLAGS_APPEND([with_cflags], [CFLAGS], [\
         -Werror=implicit-function-declaration \
         -Werror=missing-declarations \
         -Werror=return-type \
+        -Werror=incompatible-pointer-types \
         -Werror=format=2 \
         -Wstrict-prototypes \
         -Wredundant-decls \