[evolution-mapi] Introduce --enable-strict configure option

[Milan Crha <mcrha src gnome org>]

commit 60e8a3f5da8bb12b2277cc001cbb4ca3bf0c3687
Author: Milan Crha <mcrha redhat com>
Date:   Tue Nov 6 17:05:19 2012 +0100

    Introduce --enable-strict configure option
    
    This is currently used to add extra AM_CPPFLAGS to disable
    deprecated symbols from other libraries.

 configure.ac |   27 ++++++++++++++++++++++++---
 1 files changed, 24 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 51e8fd7..7a614a8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,9 +52,7 @@ dnl ***********************
 dnl Compiler Warning Flags
 dnl ***********************
 AS_COMPILER_FLAGS(WARNING_FLAGS,
-	"-DE_BOOK_DISABLE_DEPRECATED
-	-DE_CAL_DISABLE_DEPRECATED
-	-Wall -Wextra
+	"-Wall -Wextra
 	-Wno-missing-field-initializers
 	-Wno-sign-compare
 	-Wno-unused-parameter
@@ -75,6 +73,29 @@ dnl	-Wredundant-decls
 
 CFLAGS="$CFLAGS $WARNING_FLAGS"
 
+dnl *******************************
+dnl Check for --enable-strict
+dnl *******************************
+AC_ARG_ENABLE([strict],
+	[AS_HELP_STRING([--enable-strict],
+	[enable strict building, like without deprecated symbols (default=auto); auto enables strict building only if .git subdirectory exists])],
+	[enable_strict=$enableval], [enable_strict=auto])
+
+AC_MSG_CHECKING([if strict building is enabled])
+if test "x$enable_strict" = xauto; then
+	dnl Be strict when compiling with .git subdirectory
+	if test -d .git ; then
+		enable_strict=yes
+	else
+		enable_strict=no
+	fi
+fi
+AC_MSG_RESULT([$enable_strict])
+
+if test "x$enable_strict" = xyes; then
+	CFLAGS="$CFLAGS -DG_DISABLE_DEPRECATED -DE_BOOK_DISABLE_DEPRECATED -DE_CAL_DISABLE_DEPRECATED"
+fi
+
 dnl ************
 dnl i18n stuff
 dnl ************