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-rw-r--r--build2/cc/compile-rule.cxx2
-rw-r--r--build2/target-type.hxx10
-rw-r--r--build2/target.cxx33
3 files changed, 25 insertions, 20 deletions
diff --git a/build2/cc/compile-rule.cxx b/build2/cc/compile-rule.cxx
index 4f11cbd..12bf2fa 100644
--- a/build2/cc/compile-rule.cxx
+++ b/build2/cc/compile-rule.cxx
@@ -2010,7 +2010,7 @@ namespace build2
// GCC until version 8 was not capable of writing the
// dependency info to stdout. We also need to sense the
- // diagnostics on the -E runs (which we do by redirective
+ // diagnostics on the -E runs (which we do by redirecting
// stderr to stdout).
//
if (cid == compiler_id::gcc)
diff --git a/build2/target-type.hxx b/build2/target-type.hxx
index 5886fdc..ebe60db 100644
--- a/build2/target-type.hxx
+++ b/build2/target-type.hxx
@@ -34,10 +34,12 @@ namespace build2
// returns NULL, then it means the default extension for this target could
// not be derived.
//
- // The extension is used in two places: search_existing_file() (called for a
- // prerequisite with the last argument true) and in target::derive_path()
- // (called for a target with the last argument false); see their
- // implementations for details.
+ // The default extension is used in two (key; there are others) places:
+ // search_existing_file() (called for a prerequisite with the last argument
+ // true) and in target::derive_extension() (called for a target with the
+ // last argument false); see their respective implementations for details.
+ // Note that the default extension supplied to derive_extension() (e.g., by
+ // a rule) takes precedence over the one returned by default_extension.
//
// If the pattern function is not NULL, then it is used to amend a pattern
// or match (reverse is false) and then, if the amendment call returned
diff --git a/build2/target.cxx b/build2/target.cxx
index 9c11156..200f562 100644
--- a/build2/target.cxx
+++ b/build2/target.cxx
@@ -471,6 +471,10 @@ namespace build2
{
// See also search_existing_file() if updating anything here.
+ // Should be no default extension if searching.
+ //
+ assert (!search || de == nullptr);
+
// The target should use extensions and they should not be fixed.
//
assert (de == nullptr || type ().default_extension != nullptr);
@@ -484,24 +488,24 @@ namespace build2
{
optional<string> e;
- // If the target type has the default extension function then try that
- // first. The reason for preferring it over what's been provided by the
- // caller is that this function will often use the 'extension' variable
- // which the user can use to override extensions.
+ // Prefer the default extension specified (presumably) by the rule over
+ // the one returned by the default extension function. Here we assume
+ // the rule knows what it is doing (see the exe{} target type for a use
+ // case).
//
- if (auto f = type ().default_extension)
- e = f (key (), base_scope (), search);
-
- if (!e)
+ if (de != nullptr)
+ e = de;
+ else
{
- if (de != nullptr)
- e = de;
- else
+ if (auto f = type ().default_extension)
+ e = f (key (), base_scope (), search);
+
+ if (!e)
{
if (search)
return nullptr;
- fail << "no default extension for target " << *this;
+ fail << "no default extension for target " << *this << endf;
}
}
@@ -850,14 +854,13 @@ namespace build2
// then we expect the rule to supply the target machine extension. But if
// it doesn't, then assume no extension (e.g., a script).
//
- return string (search
- ?
+ return string (!search ? "" :
#ifdef _WIN32
"exe"
#else
""
#endif
- : "");
+ );
}
#ifdef _WIN32