From 9637eb583a4e2bc028b93d5b8f5ceb981402554d Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 6 Oct 2021 08:49:56 +0200
Subject: Do not install exe{} prerequisites of file targets

---
 libbuild2/install/rule.cxx |  3 +++
 libbuild2/install/rule.hxx | 22 +++++++++++++++-------
 2 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/libbuild2/install/rule.cxx b/libbuild2/install/rule.cxx
index d678940..3543286 100644
--- a/libbuild2/install/rule.cxx
+++ b/libbuild2/install/rule.cxx
@@ -288,6 +288,9 @@ namespace build2
     filter (const scope* is,
             action, const target& t, const prerequisite& p) const
     {
+      if (p.is_a<exe> ())
+        return nullptr;
+
       const target& pt (search (t, p));
       return is == nullptr || pt.in (*is) ? &pt : nullptr;
     }
diff --git a/libbuild2/install/rule.hxx b/libbuild2/install/rule.hxx
index ce60bb9..2ed162e 100644
--- a/libbuild2/install/rule.hxx
+++ b/libbuild2/install/rule.hxx
@@ -25,9 +25,10 @@ namespace build2
       match (action, target&, const string&) const override;
 
       // Return NULL if this prerequisite should be ignored and pointer to its
-      // target otherwise. The default implementation ignores prerequsites
-      // that are outside of the installation scope (see install_scope() for
-      // details).
+      // target otherwise.
+      //
+      // The default implementation ignores prerequsites that are outside of
+      // the installation scope (see install_scope() for details).
       //
       // The prerequisite is passed as an iterator allowing the filter to
       // "see" inside groups.
@@ -80,7 +81,9 @@ namespace build2
       match (action, target&, const string&) const override;
 
       // Return NULL if this group member should be ignored and pointer to its
-      // target otherwise. The default implementation accepts all members.
+      // target otherwise.
+      //
+      // The default implementation accepts all members.
       //
       virtual const target*
       filter (action, const target&, const target& group_member) const;
@@ -105,9 +108,14 @@ namespace build2
       match (action, target&, const string&) const override;
 
       // Return NULL if this prerequisite should be ignored and pointer to its
-      // target otherwise. The default implementation ignores prerequsites
-      // that are outside of the installation scope (see install_scope() for
-      // details).
+      // target otherwise.
+      //
+      // The default implementation ignores prerequsites that are outside of
+      // the installation scope (see install_scope() for details). It also
+      // ignores exe{} prerequisites assuming an exe{} listed for a file
+      // target is there to execute (e.g., to generate that target) and
+      // normally should not be installed (an exe{} would typically be
+      // installed via the dir{./} alias).
       //
       // The prerequisite is passed as an iterator allowing the filter to
       // "see" inside groups.
-- 
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