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emacs: enable second-stage "compilation" (i.e. dumping) via qemu
cuts startup time of emacs down to a few seconds
This commit is contained in:
David Kühling
parent
1d560afdcb
commit
ed5db4233c
@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
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PKG_NAME:=emacs
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PKG_VERSION:=23.2
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PKG_RELEASE:=4
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PKG_RELEASE:=5
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PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
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PKG_SOURCE_URL:=ftp://ftp.fu-berlin.de/pub/gnu/emacs/ \
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@GNU/emacs/
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@ -17,6 +17,9 @@ PKG_SOURCE_URL:=ftp://ftp.fu-berlin.de/pub/gnu/emacs/ \
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PKG_MD5SUM:=b6691852dae0bc142b3c12749f6b7ade
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PKG_INSTALL:=1
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PKG_BUILD_PARALLEL:=1
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HOST_BUILD_PARALLEL:=1
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PKG_FIXUP:=libtool
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PKG_REMOVE_FILES:=
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@ -86,6 +89,8 @@ $(call Package/emacs/Default/description)
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C-h f in case provided documentation of an Emacs function is insufficient.
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endef
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DUMP_EMACS=1
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EMACS_STRIPTEASE_ARGS = \
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--without-x \
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--without-xpm \
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@ -102,19 +107,50 @@ EMACS_STRIPTEASE_ARGS = \
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HOST_CONFIGURE_ARGS += $(EMACS_STRIPTEASE_ARGS)
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CONFIGURE_ARGS += $(EMACS_STRIPTEASE_ARGS)
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MAKE_FLAGS += "LD=$(TARGET_CROSS)gcc"
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## Don't try that: lowering PURESIZE makes Emacs' RAM usage explode! Maybe
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## something about Elisp garbage collection!?
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#TARGET_CPPFLAGS += -DPURESIZE=16
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## Keep emacs build system from doing all kinds nasty tricks that won't work
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## (well) with openwrt and uclibc. Especially keep it from attempting to
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## manually configure crt* startup file linking. We won't be able to 'dump'
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## during cross-compile anyway. Dumping inside the target system seems not
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## possible due to lack of RAM. Note that we also need to sanitize the
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## Makefile using 'sed' below.
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# sed-script to apply to src/Makefile of emacs sources. more commands
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# appended below
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EMACS_MAKEFILE_SED = ;
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# sed-script to apply to src/epaths.h, commands appended below
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EMACS_EPATHS_SED = ;
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## when DUMP_EMACS is unset, we keep emacs build system from doing all
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## kinds nasty tricks that won't work (well) with openwrt and uclibc.
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## Especially keep it from attempting to manually configure crt* startup file
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## linking. We won't be able to 'dump' during cross-compile anyway. Dumping
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## inside the target system seems not possible due to lack of RAM. Note that
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## we also need to sanitize the Makefile using 'sed' below.
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ifeq ($(DUMP_EMACS),)
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MAKE_FLAGS += "LD=$(TARGET_CROSS)gcc"
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TARGET_CPPFLAGS += -DCANNOT_DUMP -DNO_REMAP -DORDINARY_LINK
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EMACS_MAKEFILE_SED += ; s;\(TEMACS_LDFLAGS\|STARTFILES\) =.*;\1 =;
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EMACS_MAKEFILE_SED += ; s; /usr/lib/crt[^ ]\+; ;g
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EMACS_EPATHS_SED += ; s;\(\#.*PATH_DUMPLOADSEARCH\).*$$$$;\1 PATH_LOADSEARCH;
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define emacs_perform_dump
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$(CP) $(PKG_BUILD_DIR)/src/temacs $(PKG_BUILD_DIR)/src/emacs
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endef
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else
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MAKE_FLAGS += LD="$(TARGET_CROSS)gcc -nostdlib"
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TARGET_CPPFLAGS +=
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# warning: on backfile it'd be $(TOOLCHAIN_DIR)/usr/lib
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EMACS_MAKEFILE_SED += ; s; /usr/lib/crt\([^ ]\+\); $(TOOLCHAIN_DIR)/lib/crt\1;g
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PKG_BUILD_DEPENDS += +qemu-host/host
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define emacs_perform_dump
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$(SED) \
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's/(member (nth 3 command-line-args) .("dump" "bootstrap"))/t/g' \
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$(PKG_BUILD_DIR)/lisp/loadup.el
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cd $(PKG_BUILD_DIR)/src && \
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$(STAGING_DIR_HOST)/bin/qemu-$(ARCH) -E LD_LIBRARY_PATH=$(STAGING_DIR_ROOT)/usr/lib/ \
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-L $(STAGING_DIR_ROOT) -E LC_ALL=C ./temacs -batch -l loadup
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endef
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endif
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define Build/Prepare
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$(call Build/Prepare/Default)
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@ -145,12 +181,10 @@ define Build/Compile
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$(call Build/Compile/Default, -C lib-src -o test-distrib)
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ln -sf $(STAGING_DIR_HOST)/bin/emacs-make-docfile $(PKG_BUILD_DIR)/lib-src/make-docfile
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ln -sf $(STAGING_DIR_HOST)/bin/emacs-prefix-args $(PKG_BUILD_DIR)/src/prefix-args
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sed -ie 's;\(TEMACS_LDFLAGS\|STARTFILES\) =.*;\1 =;' $(PKG_BUILD_DIR)/src/Makefile
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# sed -ie 's; /usr/lib/crt[^ ]\+; $(TOOLCHAIN_DIR)/usr/lib/crt;g' $(PKG_BUILD_DIR)/src/Makefile
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sed -ie 's; /usr/lib/crt[^ ]\+; ;g' $(PKG_BUILD_DIR)/src/Makefile
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sed -ie 's;\(#.*PATH_DUMPLOADSEARCH\).*$$$$;\1 PATH_LOADSEARCH;' $(PKG_BUILD_DIR)/src/epaths.h
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$(SED) '$(EMACS_MAKEFILE_SED)' $(PKG_BUILD_DIR)/src/Makefile
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$(SED) '$(EMACS_EPATHS_SED)' $(PKG_BUILD_DIR)/src/epaths.h
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$(call Build/Compile/Default, -C src -o lib-src -o prefix-args -o ../lib-src/make-docfile temacs ../etc/DOC)
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cp -v $(PKG_BUILD_DIR)/src/temacs $(PKG_BUILD_DIR)/src/emacs
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$(call emacs_perform_dump)
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$(call Build/Compile/Default, -C lisp EMACS=$(STAGING_DIR_HOST)/bin/emacs)
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$(call Build/Compile/Default, -C leim BUILT-EMACS=$(STAGING_DIR_HOST)/bin/emacs)
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endef
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15
emacs/patches/030-workaround-qemu-ftruncate.patch
Normal file
15
emacs/patches/030-workaround-qemu-ftruncate.patch
Normal file
@ -0,0 +1,15 @@
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Index: emacs-23.2/src/unexelf.c
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===================================================================
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--- emacs-23.2.orig/src/unexelf.c 2011-06-26 09:58:31.000000000 +0200
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+++ emacs-23.2/src/unexelf.c 2011-06-26 10:00:40.000000000 +0200
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@@ -827,7 +827,9 @@
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new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_incr;
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- if (ftruncate (new_file, new_file_size))
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+ /* this gives an error code when run via Qemu userspace emulation,
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+ just ignoring the result code seems to fix the problem. */
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+ if (ftruncate (new_file, new_file_size) && 0)
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fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno);
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new_base = mmap (NULL, new_file_size, PROT_READ | PROT_WRITE,
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