tools: cache the configure results of eleven more autotools tools

Configure stage without a cache against a warm cache:

  mtools      3.34 s -> 0.28 s
  gengetopt   4.39 s -> 2.13 s
  fakeroot   10.97 s -> 8.73 s
  xz          4.32 s -> 2.17 s
  libressl    3.07 s -> 1.46 s
  flex       12.32 s -> 10.98 s
  expat       2.74 s -> 1.52 s
  bc          1.34 s -> 0.38 s
  dosfstools  3.13 s -> 2.54 s
  libtool     2.86 s -> 2.29 s
  mtd-utils   4.06 s -> 3.56 s

flex, fakeroot, dosfstools and mtd-utils run autoreconf in the same
stage, and the cache does not reach that part.

Each of the eleven configures the same way with a warm cache as it does
without one: the check configures three times, without a cache, with a
cold cache and with a warm cache, and every generated file of the first
and the last run is identical. A static scan of each configure script
found no cache check that changes CFLAGS, CPPFLAGS, LDFLAGS or LIBS
without restoring it.

patchelf, mklibs and automake pass the same check but gain less than
half a second, so they stay out.

make world after make tools/clean now takes 121 s against 177 s with
cold caches.

Signed-off-by: John Crispin <john@phrozen.org>

tools/bc/Makefile

@@ -17,6 +17,8 @@ PKG_CPE_ID:=cpe:/a:gnu:bc
 
 PKG_SUBDIRS:=lib bc dc
 
+HOST_CONFIGURE_CACHE:=1
+
 include $(INCLUDE_DIR)/host-build.mk
 
 define Host/Uninstall

tools/dosfstools/Makefile

@@ -18,6 +18,7 @@ PKG_HASH:=64926eebf90092dca21b14259a5301b7b98e7b1943e8a201c7d726084809b527
 
 HOST_FIXUP:=autoreconf
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/expat/Makefile

@@ -16,6 +16,7 @@ PKG_HASH:=b8ece2437692dad44d851c4532723390a5a330990007706be9c8d2b90d294f36
 PKG_SOURCE_URL:=https://github.com/libexpat/libexpat/releases/download/R_$(subst .,_,$(PKG_VERSION))
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/fakeroot/Makefile

@@ -15,6 +15,8 @@ PKG_LICENSE:=GPL-3.0-or-later
 PKG_LICENSE_FILES:=COPYING
 PKG_FIXUP:=autoreconf
 
+HOST_CONFIGURE_CACHE:=1
+
 include $(INCLUDE_DIR)/host-build.mk
 
 HOST_CONFIGURE_VARS += \

tools/flex/Makefile

@@ -16,6 +16,7 @@ PKG_HASH:=e87aae032bf07c26f85ac0ed3250998c37621d95f8bd748b31f15b33c45ee995
 
 HOST_FIXUP:=autoreconf
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/gengetopt/Makefile

@@ -16,6 +16,7 @@ PKG_HASH:=b941aec9011864978dd7fdeb052b1943535824169d2aa2b0e7eae9ab807584ac
 PKG_SUBDIRS:=$$$$(foreach dir,gl src skels,$$$$(wildcard $$$$(dir)) )
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/libressl/Makefile

@@ -19,6 +19,7 @@ PKG_SOURCE_URL:=https://mirror.ox.ac.uk/pub/OpenBSD/LibreSSL \
 	https://ftp.openbsd.org/pub/OpenBSD/LibreSSL
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/libtool/Makefile

@@ -15,6 +15,7 @@ PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
 PKG_HASH:=da8ebb2ce4dcf46b90098daf962cffa68f4b4f62ea60f798d0ef12929ede6adf
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/mtd-utils/Makefile

@@ -18,6 +18,7 @@ PKG_CPE_ID:=cpe:/a:mtd-utils_project:mtd-utils
 PKG_FIXUP:=autoreconf
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/mtools/Makefile

@@ -14,6 +14,7 @@ PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
 PKG_HASH:=6fe5193583d6e7c59da75e63d7234f76c0b07caf33b103894f46f66a871ffc9f
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/xz/Makefile

@@ -17,6 +17,7 @@ PKG_HASH:=3340ae48f88665abc78d71dc43446fb3f7e70b48fd59844ac0e14958cef6e00b
 PKG_CPE_ID:=cpe:/a:tukaani:xz
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk