cross-make

早期freebsd实现

# This variable gets added to GCC_CFLAGS.
CROSS_GCC_CFLAGS = -B$(tooldir)/bin/

# Expect user to provide libgcc1.a,
# and give up immediately if the user has not done so.
LIBGCC1 = libgcc1.cross

# Specify tools and options for manipulating libraries for the target machine.
AR = $(AR_FOR_TARGET)
AR_FLAGS = $(AR_FOR_TARGET_FLAGS)
OLDAR = $(AR_FOR_TARGET)
OLDAR_FLAGS = $(AR_FOR_TARGET_FLAGS)
RANLIB = $(RANLIB_FOR_TARGET)
RANLIB_TEST = $(RANLIB_TEST_FOR_TARGET)

# Cause installation of the cross-compilation tools
# before we try to build libgcc.a.
CROSS_TOOLS = install-cross-tools

# Dir to search for system headers.  Normally /usr/include.
SYSTEM_HEADER_DIR = $(libsubdir)/sys-include

# Cause installation using install-cross.
INSTALL_TARGET = install-cross

# Don't try to compile the things we can't compile.
ALL = all.cross

# Don't install assert.h in /usr/local/include.
assertdir = $(tooldir)/include