configure: Test compiler flags

[empserver] / configure.ac

diff --git a/configure.ac b/configure.ac
index e18da88956e0bde526d9818084f6c0f89aff94c4..64cea21a6f2d914d55434e7dded7d23d62dea268 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
 #
 #   Empire - A multi-player, client/server Internet based war game.
-#   Copyright (C) 1986-2013, Dave Pare, Jeff Bailey, Thomas Ruschak,
+#   Copyright (C) 1986-2015, Dave Pare, Jeff Bailey, Thomas Ruschak,
 #                 Ken Stevens, Steve McClure, Markus Armbruster
 #
 #   Empire is free software: you can redistribute it and/or modify
@@ -27,7 +27,7 @@
 #   configure.ac: Autoconf input file
 #
 #   Known contributors to this file:
-#      Markus Armbruster, 2005-2013
+#      Markus Armbruster, 2005-2015
 #
 # Process this file with autoconf to produce a configure script.
 
@@ -37,7 +37,7 @@
 # whether it's worth fixing.
 
 AC_PREREQ(2.64)
-AC_INIT([Wolfpack Empire], [4.3.31], [wolfpack@wolfpackempire.com], [empire],
+AC_INIT([Wolfpack Empire], [4.3.34], [wolfpack@wolfpackempire.com], [empire],
        [http://www.wolfpackempire.com/])
 AC_CONFIG_SRCDIR([include/combat.h])
 AC_CONFIG_AUX_DIR([build-aux])
@@ -50,7 +50,6 @@ AC_PROG_AWK
 AC_PROG_INSTALL
 AC_PROG_RANLIB
 AC_PROG_CC
-AC_SUBST(GCC)
 AM_PROG_CC_C_O
 # Private automake macro, tsk, tsk, tsk...
 _AM_DEPENDENCIES(CC)
@@ -81,7 +80,25 @@ LIBS_server="$LIBS"
 
 ### Checks for typedefs, structures, and compiler characteristics
 
-AC_C_CHAR_UNSIGNED
+# Enable useful warnings
+# clang needs to be tested with -Werror=unknown-warning-option
+AX_CHECK_COMPILE_FLAG([-Werror=unknown-warning-option],
+[cflags_test="-Werror=unknown-warning-option"],
+[cflags_test=""])
+MY_APPEND_COMPILE_FLAGS([-Wall -Wextra dnl
+-Wmissing-prototypes dnl
+-Wnested-externs dnl
+-Wpointer-arith dnl
+-Wredundant-decls dnl
+-Wstrict-prototypes dnl
+-Wno-unused-parameter dnl
+], [], [$cflags_test])
+
+# Our carg() conflicts with libm's TODO clean that up
+MY_APPEND_COMPILE_FLAGS([-fno-builtin-carg])
+
+# No multiple definitions of uninitialized global variables
+MY_APPEND_COMPILE_FLAGS([-fno-common])
 
 
 ### Checks for library functions