* preliminary autoconf-based cross-building support
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Suzuki, Toshiya (鈴木俊哉)
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16
ChangeLog
16
ChangeLog
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@ -1,3 +1,19 @@
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2006-10-14 suzuki toshiya <mpsuzuki@hiroshima-u.ac.jp>
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* docs/INSTALL.CROSS: New document file for cross-building.
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* builds/unix/configure.raw: Preliminary cross-building support.
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Find native C compiler and pass it by CC_BUILD, and
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find suffix for native executable and pass it by EXEEXT_BUILD.
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Also suffix for target executable is passed by EXEEXT.
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* builds/unix/unix-cc.in: CCraw_build and E_BUILD are introduced
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to build apinames which runs on building system. They are set by
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CC_BUILD and EXEEXT_BUILD.
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* builds/exports.mk: Change the extension for apinames from the
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suffix for target (E) to that for building host (E_BUILD).
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2006-10-12 Werner Lemberg <wl@gnu.org>
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* docs/INSTALL.UNX, docs/UPGRADE.UNX: Renamed to...
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@ -48,7 +48,7 @@ ifneq ($(EXPORTS_LIST),)
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# Note that $(APINAMES_OPTIONS) is empty, except for Windows compilers.
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#
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APINAMES_SRC := $(TOP_DIR)/src/tools/apinames.c
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APINAMES_EXE := $(OBJ_DIR)/apinames$E
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APINAMES_EXE := $(OBJ_DIR)/apinames$(E_BUILD)
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$(APINAMES_EXE): $(APINAMES_SRC)
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$(CCexe) $(TE)$@ $<
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@ -25,6 +25,8 @@ AC_SUBST([ft_version])
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# checks for system type
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AC_CANONICAL_BUILD
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AC_CANONICAL_HOST
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AC_CANONICAL_TARGET
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@ -32,6 +34,42 @@ AC_CANONICAL_TARGET
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AC_PROG_CC
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AC_PROG_CPP
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AC_SUBST(EXEEXT)
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# checks for native programs to generate building tool
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if test ${cross_compiling} = yes; then
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AC_CHECK_PROG(CC_BUILD, ${build}-gcc, ${build-gcc})
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test -z "${CC_BUILD}" && AC_CHECK_PROG(CC_BUILD, gcc, gcc)
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test -z "${CC_BUILD}" && AC_CHECK_PROG(CC_BUILD, cc, cc, , , /usr/ucb/cc)
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test -z "${CC_BUILD}" && AC_MSG_ERROR([cannot find native C compiler])
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AC_MSG_CHECKING([for suffix of native executables])
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rm -f a.* b.* a_out.exe conftest.*
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echo > conftest.c "int main() { return 0;}"
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${CC_BUILD} conftest.c || AC_MSG_ERROR([native C compiler is not working])
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rm -f conftest.c
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if test -x a.out -o -x b.out -o -x conftest; then
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EXEEXT_BUILD=""
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elif test -x a_out.exe -o -x conftest.exe; then
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EXEEXT_BUILD=".exe"
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elif test -x conftest.* ; then
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EXEEXT_BUILD=`echo conftest.* | sed -n '1s/^.*\.//g'`
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fi
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AC_MSG_RESULT($EXEEXT_BUILD)
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else
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CC_BUILD=${CC}
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EXEEXT_BUILD=${EXEEXT}
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fi
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if test ! -z ${EXEEXT_BUILD}; then
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EXEEXT_BUILD=."${EXEEXT_BUILD}"
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fi
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AC_SUBST(CC_BUILD)
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AC_SUBST(EXEEXT_BUILD)
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# get compiler flags right
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@ -25,6 +25,12 @@ O := lo
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SO := o
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# The executable file extension. Although most Unix platform use no extension,
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# we copy the extension detected by autoconf, useful for cross building on
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# Unix system for non-Unix system.
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#
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E := @EXEEXT@
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# The library file extension (for standard and static libraries). This can
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# be .a, .lib, etc., depending on the platform.
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#
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@ -88,10 +94,12 @@ CC := $(LIBTOOL) --mode=compile $(CCraw)
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LDFLAGS := @LDFLAGS@
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# export symbols (XXX: HOW TO DEAL WITH CROSS COMPILATION ?)
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# export symbols
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#
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CCraw_build := @CC_BUILD@ # native CC of building system
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E_BUILD := @EXEEXT_BUILD@ # extension for exexutable on building system
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EXPORTS_LIST := $(OBJ_DIR)/ftexport.sym
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CCexe := $(CCraw) # used to compile "apinames" only
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CCexe := $(CCraw_build) # used to compile "apinames" only
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# Library linking
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@ -0,0 +1,135 @@
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This document contains instructions on how to cross-build the FreeType
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library on Unix systems, for example, building binaries for Linux/MIPS
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on FreeBSD/i386. Before reading this document, please consult
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INSTALL.UNIX for required tools and the basic self-building procedure.
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1. Required Tools
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-----------------
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For self-building the FreeType library on a Unix system, GNU Make
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3.78.1 or newer is required. INSTALL.UNIX contains hints how to
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check the installed `make'.
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The GNU C compiler to cross-build the target system is required.
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At present, using non-GNU cross compiler is not tested. The cross
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compiler is expected to be installed with a system prefix. For
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example, if your building system is FreeBSD/i386 and the target
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system is Linux/MIPS, the cross compiler should be installed with
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the name `mips-ip22-linuxelf-gcc'.
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A C compiler for a self-build is required also, to build a tool
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that is executed during the building procedure. Non-GNU self
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compilers are acceptable, but such a setup is not tested yet.
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2. Configuration
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----------------
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2.1. Building and target system
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To configure for cross-build, the options `--host=<system>' and
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`--build=<system>' must be passed to configure. For example, if
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your building system is FreeBSD/i386 and the target system is
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Linux/MIPS, say
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./configure \
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--build=i386-unknown-freebsd \
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--host=mips-ip22-linuxelf \
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[other options]
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It should be noted that `--host=<system>' specifies the system
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where the built binaries will be executed, not the system where
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the build actually happens. Older versions of GNU autoconf use
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the option pair `--host=' and `--target='. This is broken and
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doesn't work. Similarly, an explicit CC specification like
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env CC=mips-ip22-linux-gcc ./configure
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or
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env CC=/usr/local/mips-ip22-linux/bin/gcc ./configure
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doesn't work either; such a configuration confuses the
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`configure' script while trying to find the cross and native C
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compilers.
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2.2. The prefix to install FreeType2
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Setting `--prefix=<prefix>' properly is important. The prefix
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to install FreeType2 is written into the freetype-config script
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and freetype2.pc configuration file.
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If the built FreeType 2 library is used as a part of the
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cross-building system, the prefix is expected to be different
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from the self-building system. For example, configuration with
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`--prefix=/usr/local' installs binaries into the system wide
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`/usr/local' directory which then can't be executed. This
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causes confusion in configuration of all applications which use
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FreeType2. Instead, use a prefix to install the cross-build
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into a separate system tree, for example,
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`--prefix=/usr/local/mips-ip22-linux/'.
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On the other hand, if the built FreeType2 is used as a part of
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the target system, the prefix to install should reflect the file
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system structure of the target system.
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3. Building command
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-------------------
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If the configuration finishes successfuly, invoking GNU make builds
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FreeType2. Just say
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make
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or
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gmake
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depending on the name the GNU make binary actually has.
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4. Installation
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---------------
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Saying
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make install
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as usual to install FreeType2 into the directory tree specified by
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the argument of the `--prefix' option.
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As noted in section 2.2, FreeType2 is sometimes configured to be
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installed into the system directory of the target system, and
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should not be installed in the cross-building system. In such
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cases, the make variable `DESTDIR' is useful to change the root
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directory in the installation. For example, after
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make DESTDIR=/mnt/target_system_root/ install
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the built FreeType2 library files are installed into the directory
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`/mnt/target_system_root/<prefix_in_configure>/lib'.
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5. TODO
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-------
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Cross building between Cygwin (or MSys) and Unix must be tested.
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----------------------------------------------------------------------
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Copyright 2006 by suzuki toshiya
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David Turner, Robert Wilhelm, and Werner Lemberg.
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This file is part of the FreeType project, and may only be used,
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modified, and distributed under the terms of the FreeType project
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license, LICENSE.TXT. By continuing to use, modify, or distribute
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this file you indicate that you have read the license and understand
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and accept it fully.
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--- end of INSTALL.CROSS ---
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