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CH03.fm Page 50 Monday, October 7, 2002 8:33 PM 50 Chapter 3 • Compilers and Assemblers N O T E There may be some other requirements when you are building a non-native compiler. It is recommended to run the configure script in a directory other than the source code directory so that the source code tree is completely separate from the place where you build the compiler. For the sake of this example, I have created a directory /gcc3/objdir and I ran the configure script from that directory. As you already know, the source code tree is under the / gcc3/gcc-3.0.4 directory. You may need to add a prefix for GCC installation files. The prefix shows the directory where GCC files will be finally installed. The default prefix is /usr/ local. This means that GCC binary files will be installed in /usr/local/bin directory. For installation purposes, I have selected /opt/gcc-3.0.4 directory as the prefix. In a typical development environment, you would do something similar to that. Just create a directory under /opt and install all of your tools and applications under /opt. The following command line will configure the GCC compilation process and will create many files under /gcc3/ objdir. These files will be used later on to build the compiler. When you start the configure script, the following messages will start scrolling up. [root@laptop objdir]# ../gcc-3.0.4/configure --prefix=/opt/ gcc-3.0.4 Configuring for a i686-pc-linux-gnu host. Created "Makefile" in /gcc3/gcc-3.0.4 using "mt-frag" Configuring libiberty... creating cache ../config.cache checking host system type... i686-pc-linux-gnu checking build system type... i686-pc-linux-gnu checking for ar... ar checking for ranlib... ranlib checking for gcc... gcc checking whether we are using GNU C... yes checking whether gcc accepts -g... yes checking for POSIXized ISC... no checking for working const... yes checking for inline... inline checking for a BSD compatible install... /usr/bin/install -c checking how to run the C preprocessor... gcc -E checking for sys/file.h... yes checking for sys/param.h... yes checking for limits.h... yes checking for stdlib.h... yes checking for string.h... yes Most of the output is truncated from the configure script to save space. When the configure script is completed, you will get back the command prompt. Now you may start building the compiler.
CH03.fm Page 51 Monday, October 7, 2002 8:33 PM Installing GNU Compiler 51 If you want to enable threads on Linux systems, you can use --enablethreads=posix as a command line option. 3.2.2.3 Building GCC It is recommended that you use GNU make for building purpose. Running the make bootstrap command will build the compiler, libraries and related utilities. Following is part of the output when you start the building process. [root@laptop objdir]# make bootstrap make[1]: Entering directory `/gcc3/objdir/libiberty' if [ x"" != x ] && [ ! -d pic ]; then \ mkdir pic; \ else true; fi touch stamp-picdir if [ x"" != x ]; then \ gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../gcc-3.0.4/ libiberty/../include -W -Wall -Wtraditional -pedantic ../../ gcc-3.0.4/libiberty/argv.c -o pic/argv.o; \ else true; fi gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../gcc-3.0.4/libiberty/ ../include -W -Wall -Wtraditional -pedantic ../../gcc-3.0.4/ libiberty/argv.c if [ x"" != x ]; then \ gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../gcc-3.0.4/ libiberty/../include -W -Wall -Wtraditional -pedantic ../../ gcc-3.0.4/libiberty/choose-temp.c -o pic/choose-temp.o; \ else true; fi gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../gcc-3.0.4/libiberty/ ../include -W -Wall -Wtraditional -pedantic ../../gcc-3.0.4/ libiberty/choose-temp.c if [ x"" != x ]; then \ gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../gcc-3.0.4/ libiberty/../include -W -Wall -Wtraditional -pedantic ../../ gcc-3.0.4/libiberty/concat.c -o pic/concat.o; \ else true; fi gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../gcc-3.0.4/libiberty/ ../include -W -Wall -Wtraditional -pedantic ../../gcc-3.0.4/ libiberty/concat.c if [ x"" != x ]; then \ gcc -c -DHAVE_CONFIG_H -g -O2 -I. -I../../gcc-3.0.4/ libiberty/../include -W -Wall -Wtraditional -pedantic ../../ gcc-3.0.4/libiberty/cplus-dem.c -o pic/cplus-dem.o; \ else true; fi Again most of the output is truncated. The building process may take a long time depending upon how powerful a computer you are using for building GCC. The process is completed in
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