Adding Central config.cache options

The following changes allow for use of a central configure cache
file.  This speeds up configuration of packages.
Its use is configurable at the top level (BR2_CONFIG_CACHE - default n).
Old style makefiles can use it if they use the following MACRO in makefiles:
$(AUTO_CONFIGURE_TARGET) see my change to directfb.mk.
New style Autotools.in will use it if you set the global option.
However you can enable the global option and on a per package overrule it by doing
the following: $(PKGNAME)_USE_CONFIG_CACHE = NO see fontconfig.mk for an example 
of this.
Finally I have removed a few config variable settings which indicated no CXX compiler
as this is wrong and breaks the build when using this central cache.

 Config.in                        |    8 ++++++++
 package/Makefile.autotools.in    |    5 ++++-
 package/Makefile.in              |   28 +++++++++++++++++++++++++++-
 package/atk/atk.mk               |    2 +-
 package/directfb/directfb.mk     |    7 +------
 package/fontconfig/fontconfig.mk |    3 +++
 package/libglib2/libglib2.mk     |    2 +-
 package/libgtk2/libgtk2.mk       |    1 -
 8 files changed, 45 insertions(+), 11 deletions(-)

I would appreciate feedback on this change (I have been testing for 2-3 weeks)
But I can never test all cases!  If you enable the BR2_CONFIG_CACHE option some
Makefile.autotools.in based packages may now break - I cannot build them all.
In this case you may need to remove config options that are being hardcoded all
over the place (like gtk saying we have 2 CXX compiler) or disable the use
of CONFIG CACHE file like I have done in fontconfig.
I can build all packages required to get WebKit on DirectFB up and running
and it runs fine.
I will try to resolve any issues this creates as fast as I can.

Signed-off-by: Daniel Laird <daniel.j.laird@nxp.com>

1 files changed, 27 insertions, 1 deletions

diff --git a/package/Makefile.in b/package/Makefile.in
index 431ca8e78..19c7c56b0 100644
--- a/package/Makefile.in
+++ b/package/Makefile.in
@@ -178,6 +178,8 @@ TARGET_STRIP=true -Not_stripping
 STRIPCMD=$(TARGET_STRIP)
 endif
 INSTALL=/usr/bin/install
+FLEX:=$(shell $(CONFIG_SHELL) -c 'which flex || type -p flex')
+BISON:=$(shell $(CONFIG_SHELL) -c 'which bison || type -p bison')
 
 HOST_ARCH:=$(shell $(HOSTCC) -dumpmachine | sed -e s'/-.*//' \
 	-e 's/sparc.*/sparc/' \
@@ -193,10 +195,23 @@ HOST_ARCH:=$(shell $(HOSTCC) -dumpmachine | sed -e s'/-.*//' \
 	)
 GNU_HOST_NAME:=$(HOST_ARCH)-$(subst ",,$(BR2_GNU_BUILD_SUFFIX))
 #")
+
+AUTO_CONFIGURE_TARGET=\
+	$(TARGET_CONFIGURE_OPTS) \
+	$(TARGET_CONFIGURE_ARGS) \
+	$(TARGET_CONFIGURE_ENV) \
+	$(if $(THIS_SRCDIR),$(THIS_SRCDIR)/,./)configure \
+		$(if $(BR2_CONFIG_CACHE),--cache-file="$(PROJECT_BUILD_DIR)/tgt-config.cache",) \
+		--target=$(GNU_TARGET_NAME) \
+		--host=$(GNU_TARGET_NAME) \
+		--build=$(GNU_HOST_NAME)
+
 TARGET_CONFIGURE_OPTS=PATH=$(TARGET_PATH) \
 		AR="$(TARGET_AR)" \
 		AS="$(TARGET_AS)" \
-		LD="$(TARGET_LD) $(TARGET_LDFLAGS)" \
+		LD="$(TARGET_LD)" \
+		CFLAGS="$(TARGET_CFLAGS)" \
+		LDFLAGS="$(TARGET_LDFLAGS)" \
 		NM="$(TARGET_NM)" \
 		CC="$(TARGET_CC) $(TARGET_CFLAGS)" \
 		GCC="$(TARGET_CC) $(TARGET_CFLAGS)" \
@@ -229,6 +244,12 @@ TARGET_CONFIGURE_OPTS=PATH=$(TARGET_PATH) \
 		PKG_CONFIG_PATH="$(STAGING_DIR)/usr/lib/pkgconfig:$(PKG_CONFIG_PATH)" \
 		STAGING_DIR="$(STAGING_DIR)"
 
+TARGET_CONFIGURE_ENV=\
+	CFLAGS="$(TARGET_CFLAGS)" \
+	CXXFLAGS="$(TARGET_CXXFLAGS)" \
+	LDFLAGS="$(TARGET_LDFLAGS)" \
+	FCFLAGS="$(TARGET_FCFLAGS)" \
+
 HOST_CONFIGURE_OPTS=PATH=$(TARGET_PATH) \
 		AR="$(HOSTAR)" \
 		AS="$(HOSTAS)" \
@@ -310,6 +331,11 @@ TARGET_CONFIGURE_ARGS= \
 	$(BR2_AC_CV_TRAP_CHECK) \
 	ac_cv_func_mmap_fixed_mapped=yes \
 	ac_cv_func_memcmp_working=yes \
+	ac_cv_have_decl_malloc=yes \
+	gl_cv_func_malloc_0_nonnull=yes \
+	ac_cv_func_malloc_0_nonnull=yes \
+	ac_cv_func_calloc_0_nonnull=yes \
+	ac_cv_func_realloc_0_nonnull=yes \
 	$(BR2_AC_CV_C_BIGENDIAN)
 
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