MoarVM: not using the right compiler

[mojca (Mojca Miklavec)]

See ​this build:

CC='/usr/bin/gcc-4.2'
CC_PRINT_OPTIONS='YES'
CC_PRINT_OPTIONS_FILE='/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_lang_MoarVM/MoarVM/work/.CC_PRINT_OPTIONS'
CFLAGS='-pipe -Os -arch ppc'
CPATH='/opt/local/include'
CPPFLAGS='-I/opt/local/include'
CXX='/usr/bin/g++-4.2'
CXXFLAGS='-pipe -Os -arch ppc'
F77FLAGS='-m32'
F90FLAGS='-pipe -Os -m32'
FCFLAGS='-pipe -Os -m32'
FFLAGS='-pipe -Os'
INSTALL='/usr/bin/install -c'
LDFLAGS='-L/opt/local/lib -Wl,-headerpad_max_install_names -arch ppc'
LIBRARY_PATH='/opt/local/lib'
MACOSX_DEPLOYMENT_TARGET='10.5'
OBJC='/usr/bin/gcc-4.2'
OBJCFLAGS='-pipe -Os -arch ppc'
OBJCXX='/usr/bin/g++-4.2'
OBJCXXFLAGS='-pipe -Os -arch ppc'

Welcome to MoarVM!

Configuring native build environment ................... OK
    trying to compile a simple C program ............... ERROR

    Can't compile simple C program.
    Failing command: clang -o try.o -c try.c 2>&1
    Error: No such file or directory

Cannot continue after this error.

[mojca (Mojca Miklavec)]

In f09323ee18a2c54dcd66edf90fa0ced05127614c/macports-ports:

MoarVM: use the right compiler

Closes: #53944

[barracuda156]

On 10.6.8 when building for ppc, clang is pulled, and the build fails. My earlier fix is ignored by Macports build system (why?).

Trying to figure out what to do about that now.

UPD: Okay, we just need to move the relevant chunk of code above configure.args. Then all is good, gcc12 is chosen.