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Make the makefiles go much faster by using the realpath

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builtin instead of shell.  On my 8 core mac pro, this speeds
up a 'make -j8' null build of the lib directory from 1.11s to
0.77s wall time.

Patch by NAKAMURA Takumi!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110166 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-08-03 22:53:22 +00:00
parent 656f6800b2
commit 7cf8fc7a45
1 changed files with 11 additions and 7 deletions
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18
Makefile.config.in
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@ -39,14 +39,18 @@ ifndef PROJECT_NAME
PROJECT_NAME := $(LLVMPackageName)
endif
PROJ_OBJ_DIR := $(shell $(PWD))
PROJ_OBJ_ROOT := $(shell cd $(PROJ_OBJ_DIR)/$(LEVEL); $(PWD))
# The macro below is expanded when 'realpath' is not built-in.
# Built-in 'realpath' is available on GNU Make 3.81.
realpath = $(shell cd $(1); $(PWD))
PROJ_OBJ_DIR := $(call realpath, .)
PROJ_OBJ_ROOT := $(call realpath, $(PROJ_OBJ_DIR)/$(LEVEL))
ifeq ($(PROJECT_NAME),llvm)
LLVM_SRC_ROOT := $(shell cd @abs_top_srcdir@; $(PWD))
LLVM_OBJ_ROOT := $(shell cd @abs_top_builddir@; $(PWD))
PROJ_SRC_ROOT := $(shell cd $(LLVM_SRC_ROOT); $(PWD))
PROJ_SRC_DIR := $(shell cd $(LLVM_SRC_ROOT)/$(patsubst $(PROJ_OBJ_ROOT)%,%,$(PROJ_OBJ_DIR)); $(PWD))
LLVM_SRC_ROOT := $(call realpath, @abs_top_srcdir@)
LLVM_OBJ_ROOT := $(call realpath, @abs_top_builddir@)
PROJ_SRC_ROOT := $(LLVM_SRC_ROOT)
PROJ_SRC_DIR := $(call realpath, $(LLVM_SRC_ROOT)/$(patsubst $(PROJ_OBJ_ROOT)%,%,$(PROJ_OBJ_DIR)))
prefix := @prefix@
PROJ_prefix := $(prefix)
PROJ_VERSION := $(LLVMVersion)
@ -66,7 +70,7 @@ endif
ifndef LLVM_OBJ_ROOT
$(error Projects must define LLVM_OBJ_ROOT)
endif
PROJ_SRC_DIR := $(shell cd $(PROJ_SRC_ROOT)/$(patsubst $(PROJ_OBJ_ROOT)%,%,$(PROJ_OBJ_DIR)); $(PWD))
PROJ_SRC_DIR := $(call realpath, $(PROJ_SRC_ROOT)/$(patsubst $(PROJ_OBJ_ROOT)%,%,$(PROJ_OBJ_DIR)))
prefix := $(PROJ_INSTALL_ROOT)
PROJ_prefix := $(prefix)
ifndef PROJ_VERSION