compiler specs: do not print '@=' when clear from context (#37787)

Ensure that spack compiler add/find/list and lists of concrete specs
print the compiler effectively as {compiler.name}{@compiler.version}.

Co-authored-by: Harmen Stoppels <harmenstoppels@gmail.com>

lib/spack/spack/cmd/__init__.py

@@ -347,7 +347,7 @@ def iter_groups(specs, indent, all_headers):
             spack.spec.architecture_color,
             architecture if architecture else "no arch",
             spack.spec.compiler_color,
-            f"{compiler}" if compiler else "no compiler",
+            f"{compiler.display_str}" if compiler else "no compiler",
         )
 
         # Sometimes we want to display specs that are not yet concretized.

lib/spack/spack/cmd/compiler.py

@@ -98,7 +98,7 @@ def compiler_find(args):
         config = spack.config.config
         filename = config.get_config_filename(args.scope, "compilers")
         tty.msg("Added %d new compiler%s to %s" % (n, s, filename))
-        colify(reversed(sorted(c.spec for c in new_compilers)), indent=4)
+        colify(reversed(sorted(c.spec.display_str for c in new_compilers)), indent=4)
     else:
         tty.msg("Found no new compilers")
     tty.msg("Compilers are defined in the following files:")
@@ -112,13 +112,13 @@ def compiler_remove(args):
         tty.die("No compilers match spec %s" % cspec)
     elif not args.all and len(compilers) > 1:
         tty.error("Multiple compilers match spec %s. Choose one:" % cspec)
-        colify(reversed(sorted([c.spec for c in compilers])), indent=4)
+        colify(reversed(sorted([c.spec.display_str for c in compilers])), indent=4)
         tty.msg("Or, use `spack compiler remove -a` to remove all of them.")
         sys.exit(1)
 
     for compiler in compilers:
         spack.compilers.remove_compiler_from_config(compiler.spec, scope=args.scope)
-        tty.msg("Removed compiler %s" % compiler.spec)
+        tty.msg("Removed compiler %s" % compiler.spec.display_str)
 
 
 def compiler_info(args):
@@ -130,7 +130,7 @@ def compiler_info(args):
         tty.die("No compilers match spec %s" % cspec)
     else:
         for c in compilers:
-            print(str(c.spec) + ":")
+            print(c.spec.display_str + ":")
             print("\tpaths:")
             for cpath in ["cc", "cxx", "f77", "fc"]:
                 print("\t\t%s = %s" % (cpath, getattr(c, cpath, None)))
@@ -188,7 +188,7 @@ def compiler_list(args):
             os_str += "-%s" % target
         cname = "%s{%s} %s" % (spack.spec.compiler_color, name, os_str)
         tty.hline(colorize(cname), char="-")
-        colify(reversed(sorted(c.spec for c in compilers)))
+        colify(reversed(sorted(c.spec.display_str for c in compilers)))
 
 
 def compiler(parser, args):

lib/spack/spack/spec.py

@@ -679,6 +679,16 @@ def from_dict(d):
         d = d["compiler"]
         return CompilerSpec(d["name"], vn.VersionList.from_dict(d))
 
+    @property
+    def display_str(self):
+        """Equivalent to {compiler.name}{@compiler.version} for Specs, without extra
+        @= for readability."""
+        if self.concrete:
+            return f"{self.name}@{self.version}"
+        elif self.versions != vn.any_version:
+            return f"{self.name}@{self.versions}"
+        return self.name
+
     def __str__(self):
         out = self.name
         if self.versions and self.versions != vn.any_version:
@@ -1730,14 +1740,14 @@ def traverse_edges(self, **kwargs):
     def short_spec(self):
         """Returns a version of the spec with the dependencies hashed
         instead of completely enumerated."""
-        spec_format = "{name}{@version}{%compiler}"
+        spec_format = "{name}{@version}{%compiler.name}{@compiler.version}"
         spec_format += "{variants}{arch=architecture}{/hash:7}"
         return self.format(spec_format)
 
     @property
     def cshort_spec(self):
         """Returns an auto-colorized version of ``self.short_spec``."""
-        spec_format = "{name}{@version}{%compiler}"
+        spec_format = "{name}{@version}{%compiler.name}{@compiler.version}"
         spec_format += "{variants}{arch=architecture}{/hash:7}"
         return self.cformat(spec_format)
 

lib/spack/spack/test/cmd/compiler.py

@@ -204,8 +204,8 @@ def test_compiler_find_mixed_suffixes(no_compilers_yaml, working_env, clangdir):
     os.environ["PATH"] = str(clangdir)
     output = compiler("find", "--scope=site")
 
-    assert "clang@=11.0.0" in output
+    assert "clang@11.0.0" in output
-    assert "gcc@=8.4.0" in output
+    assert "gcc@8.4.0" in output
 
     config = spack.compilers.get_compiler_config("site", False)
     clang = next(c["compiler"] for c in config if c["compiler"]["spec"] == "clang@=11.0.0")
@@ -246,8 +246,8 @@ def test_compiler_find_prefer_no_suffix(no_compilers_yaml, working_env, clangdir
     os.environ["PATH"] = str(clangdir)
     output = compiler("find", "--scope=site")
 
-    assert "clang@=11.0.0" in output
+    assert "clang@11.0.0" in output
-    assert "gcc@=8.4.0" in output
+    assert "gcc@8.4.0" in output
 
     config = spack.compilers.get_compiler_config("site", False)
     clang = next(c["compiler"] for c in config if c["compiler"]["spec"] == "clang@=11.0.0")