tools: cache the configure results of ten autotools tools

These ten hold up the wall clock on their own. Their configure stages
run while nothing else does, because the tools build in dependency
order. Measured over a full build, cold cache against warm:

  sed        21.68 s -> 1.22 s
  m4         21.48 s -> 1.22 s
  findutils  19.47 s -> 1.56 s
  tar        17.75 s -> 1.47 s
  cpio       14.28 s -> 1.26 s
  bison      12.81 s -> 1.29 s
  patch      12.16 s -> 1.31 s
  elfutils   26.58 s -> 15.47 s

Each of the ten configures the same way with a warm cache as it does
without one. The check runs configure three times, without a cache, with
a cold cache and with a warm cache, and compares every file that
configure generates between the first and the last. ncurses fails that
check; these do not.

The only difference left is ac_ct_AR and ac_ct_RANLIB, which a cold run
fills through the fallback path of AC_CHECK_TOOL and a warm run leaves
empty. AR and RANLIB are correct in both, and no generated Makefile
reads the ac_ct_ form.

tools/cmake keeps its 33 s, the longest configure stage in the build. It
bootstraps with its own script rather than autoconf, so this does not
reach it.

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

tools/bison/Makefile

@@ -15,6 +15,7 @@ PKG_HASH:=06c9e13bdf7eb24d4ceb6b59205a4f67c2c7e7213119644430fe82fbd14a0abb
 PKG_CPE_ID:=cpe:/a:gnu:bison
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/cpio/Makefile

@@ -9,6 +9,8 @@ PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.bz2
 PKG_SOURCE_URL:=@GNU/cpio
 PKG_HASH:=937610b97c329a1ec9268553fb780037bcfff0dcffe9725ebc4fd9c1aa9075db
 
+HOST_CONFIGURE_CACHE:=1
+
 HOST_BUILD_PARALLEL:=1
 
 include $(INCLUDE_DIR)/host-build.mk

tools/e2fsprogs/Makefile

@@ -16,6 +16,7 @@ PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=@KERNEL/linux/kernel/people/tytso/e2fsprogs/v$(PKG_VERSION)/
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/elfutils/Makefile

@@ -49,6 +49,7 @@ PKG_GNULIB_MODS = \
 	tsearch
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/findutils/Makefile

@@ -17,6 +17,7 @@ PKG_HASH:=1387e0b67ff247d2abde998f90dfbf70c1491391a59ddfecb8ae698789f0a4f5
 PKG_PROGRAMS:=find locate updatedb xargs
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/gmp/Makefile

@@ -17,6 +17,7 @@ PKG_CPE_ID:=cpe:/a:gmplib:gmp
 HOST_FIXUP:=autoreconf
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/m4/Makefile

@@ -15,6 +15,7 @@ PKG_SOURCE_URL:=@GNU/$(PKG_NAME)
 PKG_HASH:=38ae59f7a30bf9c108193cc5c25fbb06014f21e230c7ede2eff614f7b7c37ed8
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/patch/Makefile

@@ -16,6 +16,7 @@ PKG_SOURCE_URL:=@GNU/patch
 PKG_HASH:=308a4983ff324521b9b21310bfc2398ca861798f02307c79eb99bb0e0d2bf980
 
 HOST_BUILD_PARALLEL := 1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 

tools/sed/Makefile

@@ -17,6 +17,7 @@ PKG_CPE_ID:=cpe:/a:gnu:sed
 export SED:=
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 HOSTCC := $(HOSTCC_NOCACHE)
 HOSTCXX := $(HOSTCXX_NOCACHE)

tools/tar/Makefile

@@ -15,6 +15,7 @@ PKG_SOURCE_URL:=@GNU/tar
 PKG_HASH:=14d55e32063ea9526e057fbf35fcabd53378e769787eff7919c3755b02d2b57e
 
 HOST_BUILD_PARALLEL:=1
+HOST_CONFIGURE_CACHE:=1
 
 include $(INCLUDE_DIR)/host-build.mk