Gpertea: /* Compiling gcc/g++ 4.5.x */

2011-01-10T17:26:33Z

Compiling gcc/g++ 4.5.x

← Older revision		Revision as of 17:26, 10 January 2011
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	When statically linking with g++, the linker expects -l arguments (libraries) to come after the files containing references to them, so '''the .o and .a files must appear before the -l flags''' in the g++ command line.		When statically linking with g++, the linker expects -l arguments (libraries) to come after the files containing references to them, so '''the .o and .a files must appear before the -l flags''' in the g++ command line.
	=== Compiling gcc/g++ 4.5.x ===		=== Compiling gcc/g++ 4.5.x ===
	I prefer to prepare the GCC compiler such that it will statically link the ~~core system and~~ C++ runtime libraries in the executables generated by the compiler. This way the portability of the precompiled binaries is maximized.		I prefer to prepare the GCC compiler such that it will statically link the C/C++ runtime libraries into the executables generated by the compiler. This way the portability of the precompiled binaries is maximized.
	In order to compile GCC/G++ this way:		In order to compile GCC/G++ this way:
	Make sure gmp, mpfr and mpc source trees are under the main gcc-/ source dir		Make sure gmp, mpfr and mpc source trees are under the main gcc-/ source dir

Gpertea at 16:33, 10 January 2011

2011-01-10T16:33:13Z

New page

=GCC/G++ notes=
=== Linking tips ===
When statically linking with g++, the linker expects -l arguments (libraries) to come after the files containing references to them, so '''the .o and .a files must appear before the -l flags''' in the g++ command line.
=== Compiling gcc/g++ 4.5.x ===
I prefer to prepare the GCC compiler such that it will statically link the core system and C++ runtime libraries in the executables generated by the compiler. This way the portability of the precompiled binaries is maximized.
In order to compile GCC/G++ this way:
*Make sure gmp, mpfr and mpc source trees are under the main gcc-*/ source dir
For some mpfr versions, the configure script may need to be patched:
<pre>extra_mpfr_configure_flags='--with-gmp-build=$$r/$(HOST_SUBDIR)/gmp' </pre>
.. replace the above line with:
<pre>extra_mpfr_configure_flags='--with-gmp-include=$$r/$(HOST_SUBDIR)/gmp --with-gmp-lib=$$r/$(HOST_SUBDIR)/gmp/'"$lt_cv_objdir" </pre>

Assuming tcsh, and that the gcc and g++ source were unpacked under the gcc-4.5.1 subdirectory:
<pre>
cd ..
mkdir gcc45obj
setenv CFLAGS '-O2'
setenv CXXFLAGS '-O2 -fno-implicit-templates'

../gcc-4.5.1/configure --prefix=/fs/sz-user-supported/Linux-x86_64/packages/gcc-4.5.1 \
--enable-threads=posix --disable-shared --disable-multilib --enable-__cxa_atexit \
--disable-libunwind-exceptions --disable-checking --build=x86_64-redhat-linux --disable-dssi \
--enable-plugin --disable-nls --with-cpu=generic --enable-languages=c,c++

make CFLAGS='-O2' BOOT_CFLAGS='-O2' BOOT_FLAGS='-O2' STAGE1_CFLAGS='-O2' LIBCFLAGS='-O2' \
LIBCXXFLAGS='-O2 -fno-implicit-templates' CXXFLAGS='-O2' bootstrap-lean

</pre>
Building may take a long time. After it is done, installing it is simply a matter of running <pre>make install</pre>

Gpertea gcc - Revision history

Gpertea: /* Compiling gcc/g++ 4.5.x */

Gpertea at 16:33, 10 January 2011