I use Mac OS, Clang, and Xcode - so far so good.

Now I want to build and test a library with GCC version 4.7.2 which I have
installed at location /usr/gcc-4.7.2/bin/g++-4.7 and I can invoke it from
the command line with

$/usr/gcc-4.7.2/bin/g++-4.7 -v
Using built-in specs.
COLLECT_GCC=/usr/gcc-4.7.2/bin/g++-4.7
COLLECT_LTO_WRAPPER=/usr/gcc-4.7.2/libexec/gcc/x86_64-apple-darwin12.2.0/4.7.2/lto-wrapper
Target: x86_64-apple-darwin12.2.0
Configured with: ../configure -q --prefix=/usr/gcc-4.7.2 --enable-lto
--enable-checking=release --with-libelf=/usr/gcc-4.7.2
--with-gmp=/usr/gcc-4.7.2 --with-mpfr=/usr/gcc-4.7.2
--with-mpc=/usr/gcc-4.7.2 --with-ppl=/usr/gcc-4.7.2
--with-cloog=/usr/gcc-4.7.2 --program-suffix=-4.7 --silent
Thread model: posix
gcc version 4.7.2 (GCC)

I've altered my user-config.jam so that it contains:

using darwin : 4.7
   : /usr/gcc-4.7.2/bin/g++-4.7
;

Since things don't seem to be working I do some testing with:

$b2 --dump-tests -d2 -a toolset=darwin-4.7 cxxflags=-std=c++03 config_info
>b2.log &
which produces an output file:

$cat
../../../bin.v2/libs/config/test/config_info.test/darwin-4.7/debug/config_info.output
Clang version 5.1 (clang-503.0.40)
    __cplusplus                             =199711L
    __STDC__                                =1
    __GNUC__                                =4
    __GNUC_MINOR__                          =2
    __GNUC_PATCHLEVEL__                     =1
    __GNUG__                                =4
    __STRICT_ANSI__                         =1
    __VERSION__                             ="4.2.1 Compatible Apple LLVM
5.1 (clang-503.0.40)"
    __REGISTER_PREFIX__                      [no value]
    __USER_LABEL_PREFIX__                   =_
    __EXCEPTIONS                            =1
    __LP64__                                =1
    __MACH__                                =1
    __APPLE__                               =1
    __APPLE_CC__                            =6000
    __STDC_HOSTED__                         =1


*********************************************************************

libc++ version 1101
    _LIBCPP_VERSION                         =1101


...

This suggests that my user-config and/or PATH and/or ??? needs to be tweaked
in
order to get this to work.

Any suggestions appreciated.

Robert Ramey






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