Try even harder to use the C compiler for assembly

Now as long as you have a C compiler available in the project, it will
be used to compile assembly even if the target contains a C++ compiler
and even if the target contains only assembly and C++ sources.

Earlier, the order in which sources appeared in a target would decide
which compiler would be used.

However, if the project only provides a C++ compiler, that will be
used for compiling assembly sources.

If this breaks your use-case, please tell us.

Includes a test that ensures that all of the above is adhered to.

1 files changed, 11 insertions, 0 deletions

diff --git a/mesonbuild/compilers.py b/mesonbuild/compilers.py
index 22fb522..76a9067 100644
--- a/mesonbuild/compilers.py
+++ b/mesonbuild/compilers.py
@@ -57,6 +57,17 @@ clike_suffixes += ('h', 'll', 's')
 
 # All these are only for C-like languages; see `clike_langs` above.
 
+def sort_clike(lang):
+    '''
+    Sorting function to sort the list of languages according to
+    reversed(compilers.clike_langs) and append the unknown langs in the end.
+    The purpose is to prefer C over C++ for files that can be compiled by
+    both such as assembly, C, etc. Also applies to ObjC, ObjC++, etc.
+    '''
+    if lang not in clike_langs:
+        return 1
+    return -clike_langs.index(lang)
+
 def is_header(fname):
     if hasattr(fname, 'fname'):
         fname = fname.fname