compat: wrap math.h to avoid AIX-specific clashes

AIX defines a class() function in its math.h header without any
guard.

2 files changed, 17 insertions, 0 deletions

diff --git a/compat/aix/math.h b/compat/aix/math.h
new file mode 100644
index 0000000000..7c8134c8f5
--- /dev/null
+++ b/compat/aix/math.h
@@ -0,0 +1,14 @@
+/*
+ * Workaround aix-specific class() function clashing with libav class usage
+ */
+
+#ifndef COMPAT_AIX_MATH_H
+#define COMPAT_AIX_MATH_H
+
+#define class class_in_math_h_causes_problems
+
+#include_next <math.h>
+
+#undef class
+
+#endif /* COMPAT_AIX_MATH_H */
diff --git a/configure b/configure
index db591e8836..e1edbe6996 100755
--- a/configure
+++ b/configure
@@ -3049,6 +3049,9 @@ enabled spic && enable_weak pic
 
 # OS specific
 case $target_os in
+    aix)
+        add_cppflags '-I\$(SRC_PATH)/compat/aix'
+        ;;
     haiku)
         prefix_default="/boot/common"
         network_extralibs="-lnetwork"