Additional system configuration is required in order to use custom version of GCC installed from the FreeBSD ports tree.
Add the following lines to the /etc/make.conf file (or modify appropriately):
.if !empty(.CURDIR:M/usr/ports/*) && exists(/usr/local/bin/gcc44) CC=gcc44 CXX=g++44 CPP=cpp44 .endif
Alternatively, it is possible to specify the ${CC} and ${CPP} variables manually.
Note: The examples above are for GCC version 4.4. To use gcc43, replace "gcc44" with "gcc43" and "4.4" with "4.3" and so on.
Many of the ports' binaries and libraries link to libgcc_s or libstdc++. The base system already includes these libraries, but from an earlier version of GCC (version 4.2.1). To supply rtld (and ldd) with correct versions, add the following lines to the /etc/libmap.conf file (or modify appropriately):
libgcc_s.so.1 gcc44/libgcc_s.so.1 libgomp.so.1 gcc44/libgomp.so.1 libobjc.so.3 gcc44/libobjc.so.2 libssp.so.0 gcc44/libssp.so.0 libstdc++.so.6 gcc44/libstdc++.so.6
Note: The examples above are for GCC version 4.4. To use gcc43, replace "gcc44" with "gcc43" and so on. Note also that all of these libraries are fully backwards compatible with base system libraries.
Warning: Some C++ programs may refuse to work if these libraries are not mapped correctly. If it is not feasible to map them all, it is recommended to map at least libstdc++.so.
To add custom CFLAGS for the ports tree which are unsupported by the base system, adjust the /etc/make.conf according to the following example:
.if !empty(.CURDIR:M/usr/ports/*) && exists(/usr/local/bin/gcc44) CC=gcc44 CXX=g++44 CPP=cpp44 CFLAGS+=-mssse3 .endif
It is possible to completely replace CFLAGS and/or define custom CPUTYPE as well. We recommend setting CPUTYPE because many ports decide their optimizations flags based on this variable.
To exclude ports that have problems with custom version of GCC, adjust the /etc/make.conf according to the following example:
.if !empty(.CURDIR:M/usr/ports/*) && exists(/usr/local/bin/gcc44) .if empty(.CURDIR:M/usr/ports/net/openldap*) CC=gcc44 CXX=g++44 CPP=cpp44 .endif .endif
The example above excludes the forced use of gcc 4.4 for the net/openldap* ports. It is also possible to specify more ports on a single line:
.if empty(.CURDIR:M/usr/ports/net/openldap*) && empty(.CURDIR:M/usr/ports/xxx/yyy) && ...
This, and other documents, can be downloaded from ftp://ftp.FreeBSD.org/pub/FreeBSD/doc/.
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For questions about this documentation, e-mail <doc@FreeBSD.org>.