4 files changed, 35 insertions, 5 deletions
diff --git a/lib/odbc/aclocal.m4 b/lib/odbc/aclocal.m4
index 9578cd35c4..918e30a886 100644
--- a/lib/odbc/aclocal.m4
+++ b/lib/odbc/aclocal.m4
@@ -1849,6 +1849,31 @@ case $erl_gethrvtime in
 esac
 ])dnl
 
+dnl ----------------------------------------------------------------------
+dnl
+dnl LM_TRY_ENABLE_CFLAG
+dnl
+dnl
+dnl Tries a CFLAG and sees if it can be enabled without compiler errors
+dnl $1: textual cflag to add
+dnl $2: variable to store the modified CFLAG in
+dnl Usage example LM_TRY_ENABLE_CFLAG([-Werror=return-type], [CFLAGS])
+dnl
+dnl
+AC_DEFUN([LM_TRY_ENABLE_CFLAG], [
+    AC_MSG_CHECKING([if we can add $1 to $2 (via CFLAGS)])
+    saved_CFLAGS=$CFLAGS;
+    CFLAGS="$1 $$2";
+    AC_TRY_COMPILE([],[return 0;],can_enable_flag=true,can_enable_flag=false)
+    CFLAGS=$saved_CFLAGS;
+    if test "X$can_enable_flag" = "Xtrue"; then
+        AC_MSG_RESULT([yes])
+        AS_VAR_SET($2, "$1 $$2")
+    else
+        AC_MSG_RESULT([no])
+    fi
+])
+
 dnl ERL_TRY_LINK_JAVA(CLASSES, FUNCTION-BODY
 dnl                   [ACTION_IF_FOUND [, ACTION-IF-NOT-FOUND]])
 dnl Freely inspired by AC_TRY_LINK. (Maybe better to create a 
diff --git a/lib/odbc/c_src/Makefile.in b/lib/odbc/c_src/Makefile.in
index 026da39e6f..6572d28ee8 100644
--- a/lib/odbc/c_src/Makefile.in
+++ b/lib/odbc/c_src/Makefile.in
@@ -108,17 +108,17 @@ docs:
 
 ifdef UNIX_TARGET
 $(UNIX_TARGET): $(OBJ_DIR)/odbcserver.o
-	$(CC) $(CFLAGS) -o $@ $(OBJ_DIR)/odbcserver.o $(LDFLAGS) $(LIBS)
+	$(V_CC) $(CFLAGS) -o $@ $(OBJ_DIR)/odbcserver.o $(LDFLAGS) $(LIBS)
 endif
 
 ifdef WIN32_TARGET
 $(WIN32_TARGET): $(OBJ_DIR)/odbcserver.o
-	$(LD) $(LDFLAGS) -o $@ $(OBJ_DIR)/odbcserver.o $(ENTRY_OBJ) \
+	$(V_LD) $(LDFLAGS) -o $@ $(OBJ_DIR)/odbcserver.o $(ENTRY_OBJ) \
 		$(LIBS) $(ENTRY_LDFLAGS)
 endif
 
 $(OBJ_DIR)/odbcserver.o: odbcserver.c
-	$(CC) $(CFLAGS) $(INCLUDES) $(TARGET_FLAGS) -o $@ -c odbcserver.c
+	$(V_CC) $(CFLAGS) $(INCLUDES) $(TARGET_FLAGS) -o $@ -c odbcserver.c
 
 # ----------------------------------------------------
 # Release Target
diff --git a/lib/odbc/configure.in b/lib/odbc/configure.in
index bec65c71bf..e6ba9f57f5 100644
--- a/lib/odbc/configure.in
+++ b/lib/odbc/configure.in
@@ -212,4 +212,9 @@ AC_SUBST(ODBC_INCLUDE)
 
 fi dnl "$with_odbc" != "no"
 
+if test "x$GCC" = xyes; then
+    # Treat certain GCC warnings as errors
+    LM_TRY_ENABLE_CFLAG([-Werror=return-type], [CFLAGS])
+fi
+
 AC_OUTPUT(c_src/$host/Makefile:c_src/Makefile.in)
diff --git a/lib/odbc/src/Makefile b/lib/odbc/src/Makefile
index 2af65cc757..bfbda8aaf4 100644
--- a/lib/odbc/src/Makefile
+++ b/lib/odbc/src/Makefile
@@ -95,9 +95,9 @@ clean:
 
 
 $(APP_TARGET): $(APP_SRC) ../vsn.mk
-	sed -e 's;%VSN%;$(VSN);' $< > $@
+	$(vsn_verbose)sed -e 's;%VSN%;$(VSN);' $< > $@
 $(APPUP_TARGET): $(APPUP_SRC) ../vsn.mk
-	sed -e 's;%VSN%;$(VSN);' $< > $@
+	$(vsn_verbose)sed -e 's;%VSN%;$(VSN);' $< > $@
 
 docs: