configure.ac: Add missing -fvisibility=hidden to CFLAGS.

diff --git a/configure.ac b/configure.ac
index ceb9ed9e9c42201c9404ca9e63e9abc3236edf7b..56dce1047496148521bfd29216b880d6562d26b0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -42,7 +42,9 @@ AH_TOP([#ifndef SRD_CONFIG_H
 #define SRD_CONFIG_H    /* To stop multiple inclusions. */])
 AH_BOTTOM([#endif /* SRD_CONFIG_H */])
 
-CFLAGS="$CFLAGS -Wall -Wextra"
+# Enable more compiler warnings via -Wall and -Wextra. Add -fvisibility=hidden
+# and enforce use of SRD_API to explicitly mark all public API functions.
+CFLAGS="$CFLAGS -Wall -Wextra -fvisibility=hidden"
 
 # Checks for programs.
 AC_PROG_CXX