environment: Replace LD with <LANG>LD

The rust code is ugly, because rust is annoying. It doesn't invoke a
linker directly (unless that linker is link.exe or lld-link.exe),
instead it invokes the C compiler (gcc or clang usually) to do it's
linking. Meson doesn't have good abstractions for this, though we
probably should because some of the D compilers do the same thing.
Either that or we should just call the c compiler directly, like vala
does.

This changes the public interface for meson, which we don't do unless we
absolutely have to. In this case I think we need to do it. A fair number
of projects have already been using 'ld' in their cross/native files to
get the ld binary and call it directly in custom_targets or generators,
and we broke that. While we could hit this problem again names like
`c_ld` and `cpp_ld` are far less likely to cause collisions than `ld`.
Additionally this gives a way to set the linker on a per-compiler basis,
which is probably in itself very useful.

Fixes #6442

1 files changed, 9 insertions, 1 deletions

diff --git a/mesonbuild/envconfig.py b/mesonbuild/envconfig.py
index c275ef2..1ebf067 100644
--- a/mesonbuild/envconfig.py
+++ b/mesonbuild/envconfig.py
@@ -313,11 +313,19 @@ class BinaryTable(HasEnvVarFallback):
         'rust': 'RUSTC',
         'vala': 'VALAC',
 
+        # Linkers
+        'c_ld': 'CC_LD',
+        'cpp_ld': 'CXX_LD',
+        'd_ld': 'D_LD',
+        'fortran_ld': 'F_LD',
+        'objc_ld': 'OBJC_LD',
+        'objcpp_ld': 'OBJCPP_LD',
+        'rust_ld': 'RUST_LD',
+
         # Binutils
         'strip': 'STRIP',
         'ar': 'AR',
         'windres': 'WINDRES',
-        'ld': 'LD',
 
         # Other tools
         'cmake': 'CMAKE',