the package. For f2c, all Fortran 95+ programs are broken and it is
generally not possible to mix output from different Fortran compilers.
Default to g95 for now as fallback compiler.
Build depends are target packages that are needed at build-time for,
e.g., static libraries to link against, header files to include, &c.
Tool depends are native packages that are needed at build-time for,
e.g., compilers/linkers/&c. to run.
ok agc
DragonFly has two compilers in base, GCC 4.4.7 and GCC 4.7.2.
The way one switches between them for userland programs is to set
CCVER in the environment.
However, to set this via make.conf is tricky. I've been using the
low level "ALL_ENV+= CCVER=gcc47", but this trick fails to properly
identify the compiler which results in _GCC_VERSION being incorrectly
defined.
Additionally, there are some prominent packages that do not build on
gcc 4.7 and the fix is either not fully understood or would require a
large amount of work to implement. In these cases, it is desireable
to specify the package be built on gcc 4.4 regardless of CCVER setting.
To address these issues, a new directive is added: DRAGONFLY_CCVER.
It is only effective if OPSYS equals "DragonFly", and it will properly
set CCVER and properly define _GCC_VERSION. It will also allow a
per package specification of a particular compiler in the pkg makefile.
Introduce USE_GCC_RUNTIME for packages which build shared libraries, but
do not use libtool to do so, and add logic to always define _USE_GCC_SHLIB
on Solaris if either USE_LIBTOOL or USE_GCC_RUNTIME are defined. On Solaris,
a non-GNU linker is always used, so this correctly adds a dependency upon the
gcc runtime for those packages.
All recent packages featuring Ada code have a hard dependency on the
lang/gnat-aux compiler package. The valid values for USE_LANGUAGES
are c, c99, c++, fortran, fortran77, java, objc, so specifying a
specific compiler was necessary up into now.
One problem with lang/gnat-aux is that it is installed at ${LOCALBASE}
where the lang/gccXX compilers are installed at ${LOCALBASE}/gccXX.
The latter compilers have no possibility of sharing conflicting files
unlike lang/gnat-aux. Rather than fundamentally update the GCC 4.6-based
lang/gnat-aux to avoid these conflicts, a new Ada-capable compiler
based on GCC 4.7 was created with the intent of being supported by
mk/compiler.mk and mk/compiler/gcc.mk.
The Ada packages will be effectively migrated from lang/gnat-aux to the
new lang/gcc-aux compiler, but lang/gcc-aux will remain as a standalone
package as it is the only GCC 4.6-based compiler that builds on
DragonFly and serves it as a world and kernel compile option.
In addition to the current language wrappers, lang/gcc-aux adds
wrappers for "ada" (unique to gcc-aux, hardlinked to gcc driver),
and the gnat, gnatmake, gnatbind, gnatlink, gnatchop, gnatprep,
and gnatls programs. Supporting all of these allows the wrapper
system to be used with Ada packages; currently wrappers are mostly
disabled on them.
The lang/gcc47 implicitly adds support for the "objc-c++" language by
adding it to the USE_LANGUAGES list, but it wasn't really supported.
An attempt was made to better support objc-c++, but this new enumeration
probably still needs work or needs to be removed completely.
Logic for Ada support:
1) All lang/gccXX compilers have version numbers ranging from 2.8.1 to 9.
2) lang/gcc-aux uses the release date as its version number in the form of
YYYYMMDD with a minimum value of 20120614, so there is no version
overlap.
3) When at least one element of USE_LANGUAGES is "ada", the value of
20120614 is added to the set of GCC_REQD which selects lang/gcc-aux.
4) The _NEED_NEWER_GCC check is disabled. It fails and isn't relevant;
unless a package sets GCC_REQD over 20120614, the only way to select
lang/gcc-aux is to specify the Ada language and only one compiler
known to gcc.mk can support it.
