[build] put config files in their folder

.gitignore

@@ -102,5 +102,3 @@ vendor/luajit/src/luajit
 *.tmp
 cscope.files
 tags
-config.guess
-config.sub

configure.ac

@@ -7,12 +7,21 @@ AC_INIT([Aegisub], [aegisub_version],, [aegisub])
 : ${CFLAGS=""}
 : ${CXXFLAGS=""}
 AC_CONFIG_SRCDIR([src/main.cpp])
+AC_CONFIG_AUX_DIR([config])
 AC_CONFIG_HEADER([acconf.h])
 AC_CONFIG_MACRO_DIR([m4macros])
 AC_GNU_SOURCE
 AC_CANONICAL_HOST
 AM_SILENT_RULES([yes])
 
+##########################
+# Only run from source dir
+##########################
+AEGISUB_PATH_SOURCE="$(dirname $(readlink -f "$0"))"
+AEGISUB_PATH_BUILD="$(pwd)"
+AS_IF([! test "$AEGISUB_PATH_BUILD" = "$AEGISUB_PATH_BUILD"],
+      [AC_MSG_ERROR([The build directory must be the same as the source directory])])
+
 ###################
 # Required packages
 ###################
@@ -88,6 +97,10 @@ AS_IF([test "x$AEGISUB_APPIMAGE_ENABLED" = "xyes"], [
     AC_PATH_PROG([WGET], [wget])
     AC_PATH_PROG([CHMOD], [chmod])
 
+    AS_IF([test "$PATCHELF" = "notfound"],  [AC_MSG_ERROR([patchelf is required for AppImage generation])])
+    AS_IF([test "$WGET" = "notfound"],      [AC_MSG_ERROR([wget is required for AppImage generation])])
+    AS_IF([test "$CHMOD" = "notfound"],     [AC_MSG_ERROR([chmod is required for AppImage generation])])
+
     # Download the AppImage creation tool, transforms the AppDir into an AppImage
     AC_MSG_CHECKING([Downloading AppImage creation tool])
     $WGET https://github.com/probonopd/AppImageKit/releases/download/continuous/appimagetool-`arch`.AppImage -O tools/appimagetool.AppImage -o config.wget.log

header.mk

@@ -33,6 +33,7 @@ DISTCLEANFILES += \
 	$(TOP)build/git_version.h \
 	$(TOP)Makefile.inc \
 	$(TOP)config.log \
+	$(TOP)config.wget.log \
 	$(TOP)acconf.h.in \
 	$(TOP)config.status \
 	$(TOP)autom4te.cache \
@@ -41,6 +42,9 @@ DISTCLEANFILES += \
 CLEANFILES += \
 	$(wildcard $(TOP)Aegisub/usr/lib/*) \
 	$(TOP)Aegisub-x86_64.AppImage \
+	$(TOP)cscope.files \
+	$(TOP)cscope.out \
+	$(TOP)tags \
 
 CLEANDIRS += \
 	$(TOP)Aegisub \