Mark binutils-related conflicts (#15075)

* Mark conflicts with binutils on darwin

* Explicitly require binutils bootstrapping and mark conflict with nvptx

* Disable gold variant by default on darwin

var/spack/repos/builtin/packages/binutils/package.py

@@ -5,6 +5,7 @@
 
 from spack import *
 import glob
+import sys
 
 
 class Binutils(AutotoolsPackage, GNUMirrorPackage):
@@ -28,7 +29,8 @@ class Binutils(AutotoolsPackage, GNUMirrorPackage):
 
     variant('plugins', default=False,
             description="enable plugins, needed for gold linker")
-    variant('gold', default=True, description="build the gold linker")
+    variant('gold', default=(sys.platform != 'darwin'),
+            description="build the gold linker")
     variant('libiberty', default=False, description='Also install libiberty.')
     variant('nls', default=True, description='Enable Native Language Support')
     variant('headers', default=False, description='Install extra headers (e.g. ELF)')
@@ -44,6 +46,9 @@ class Binutils(AutotoolsPackage, GNUMirrorPackage):
     depends_on('m4', type='build', when='@:2.29.99 +gold')
     depends_on('bison', type='build', when='@:2.29.99 +gold')
 
+    conflicts('+gold', when='platform=darwin',
+              msg="Binutils cannot build linkers on macOS")
+
     def configure_args(self):
         spec = self.spec
 

var/spack/repos/builtin/packages/gcc/package.py

@@ -187,6 +187,11 @@ class Gcc(AutotoolsPackage, GNUMirrorPackage):
     conflicts('languages=jit', when='+nvptx')
     conflicts('languages=objc', when='+nvptx')
     conflicts('languages=obj-c++', when='+nvptx')
+    # NVPTX build disables bootstrap
+    conflicts('+binutils', when='+nvptx')
+
+    # Binutils can't build ld on macOS
+    conflicts('+binutils', when='platform=darwin')
 
     if sys.platform == 'darwin':
         # Fix parallel build on APFS filesystem
@@ -298,17 +303,20 @@ def configure_args(self):
 
         # Binutils
         if spec.satisfies('+binutils'):
-            static_bootstrap_flags = '-static-libstdc++ -static-libgcc'
+            stage1_ldflags = str(self.rpath_args)
+            boot_ldflags = stage1_ldflags + ' -static-libstdc++ -static-libgcc'
+            if '%gcc' in spec:
+                stage1_ldflags = boot_ldflags
+            binutils = spec['binutils'].prefix.bin
             options.extend([
                 '--with-sysroot=/',
-                '--with-stage1-ldflags={0} {1}'.format(
-                    self.rpath_args, static_bootstrap_flags),
-                '--with-boot-ldflags={0} {1}'.format(
-                    self.rpath_args, static_bootstrap_flags),
+                '--with-stage1-ldflags=' + stage1_ldflags,
+                '--with-boot-ldflags=' + boot_ldflags,
                 '--with-gnu-ld',
-                '--with-ld={0}/ld'.format(spec['binutils'].prefix.bin),
+                '--with-ld=' + binutils.ld,
                 '--with-gnu-as',
-                '--with-as={0}/as'.format(spec['binutils'].prefix.bin),
+                '--with-as=' + binutils.join('as'),
+                '--enable-bootstrap',
             ])
 
         # MPC

var/spack/repos/builtin/packages/llvm/package.py

@@ -4,6 +4,7 @@
 # SPDX-License-Identifier: (Apache-2.0 OR MIT)
 
 from spack import *
+import sys
 
 
 class Llvm(CMakePackage):
@@ -71,7 +72,7 @@ class Llvm(CMakePackage):
             description="Build the LLVM C++ standard library")
     variant('compiler-rt', default=True,
             description="Build LLVM compiler runtime, including sanitizers")
-    variant('gold', default=True,
+    variant('gold', default=(sys.platform != 'darwin'),
             description="Add support for LTO with the gold linker plugin")
     variant('shared_libs', default=False,
             description="Build all components as shared libraries, faster, "