[goffice] Compilation: make missing prototypes hard errors like gnumeric.

[Morten Welinder <mortenw src gnome org>]

commit 759c99618316a27b9fa8d6d4af0e03a7d576eacc
Author: Morten Welinder <terra gnome org>
Date:   Fri Feb 15 19:03:21 2013 -0500

    Compilation: make missing prototypes hard errors like gnumeric.

 configure.ac |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 33a65dc..6b1b128 100644
--- a/configure.ac
+++ b/configure.ac
@@ -414,12 +414,13 @@ if test "$GCC" = "yes" -a "x$set_more_warnings" != "xno"; then
                         -Wchar-subscripts -Wwrite-strings \
                         -Wdeclaration-after-statement -Wnested-externs \
                         -Wmissing-noreturn -Wmissing-prototypes \
+                        -Werror=missing-prototypes -Werror=nested-externs \
+                        -Werror=implicit-function-declaration \
                         -Wmissing-declarations -Wno-pointer-sign \
-                        -Wbitwise -Wcast-to-as \
+                        -Werror=format-security -Wbitwise -Wcast-to-as \
                         -Wdefault-bitfield-sign -Wdo-while -Wparen-string \
-                        -Wptr-subtraction-blows -Wreturn-void -Wtypesign \
-                        -Werror=format-security"
-       if test goffice_devel = yes; then
+                        -Wptr-subtraction-blows -Wreturn-void -Wtypesign"
+       if test $goffice_devel = yes; then
                dnl Avoid triggering a warning in gtk+ headers for stable.
                warning_options="$warning_options -Wstrict-prototypes"
        fi