meson.build: fix cosmetics of compiler display

If you specify something like --cc="ccache gcc" on your configure line
the summary output misses the rest of the cmd_array. Do some string
joining to make it complete.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210527160319.19834-3-alex.bennee@linaro.org>

meson.build

@@ -2537,15 +2537,15 @@ summary(summary_info, bool_yn: true, section: 'Configurable features')
 summary_info = {}
 summary_info += {'host CPU':          cpu}
 summary_info += {'host endianness':   build_machine.endian()}
-summary_info += {'C compiler':        meson.get_compiler('c').cmd_array()[0]}
-summary_info += {'Host C compiler':   meson.get_compiler('c', native: true).cmd_array()[0]}
+summary_info += {'C compiler':        ' '.join(meson.get_compiler('c').cmd_array())}
+summary_info += {'Host C compiler':   ' '.join(meson.get_compiler('c', native: true).cmd_array())}
 if link_language == 'cpp'
-  summary_info += {'C++ compiler':      meson.get_compiler('cpp').cmd_array()[0]}
+  summary_info += {'C++ compiler':    ' '.join(meson.get_compiler('cpp').cmd_array())}
 else
   summary_info += {'C++ compiler':      false}
 endif
 if targetos == 'darwin'
-  summary_info += {'Objective-C compiler': meson.get_compiler('objc').cmd_array()[0]}
+  summary_info += {'Objective-C compiler': ' '.join(meson.get_compiler('objc').cmd_array())}
 endif
 if targetos == 'windows'
   if 'WIN_SDK' in config_host