Disable dynamic build system module loading in bootstrap build

We don't really need it so why jump through hoops like trying to portably
link -ldl, etc.

3 files changed, 19 insertions, 8 deletions

diff --git a/bootstrap.gmake b/bootstrap.gmake
index 269d749..e4d4b33 100644
--- a/bootstrap.gmake
+++ b/bootstrap.gmake
@@ -43,7 +43,7 @@ ifeq ($(OS),Windows_NT)
   chost := i686-w64-mingw32
   override LIBS += -limagehlp
 else
-  override LIBS += -lpthread -ldl
+  override LIBS += -lpthread
 endif
 
 # Remove all the built-in rules, enable second expansion, etc.
diff --git a/bootstrap.sh b/bootstrap.sh
index 7d6a895..6eb570f 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -146,4 +146,4 @@ done
 # mode since 4.9 doesn't recognize c++1z.
 #
 set -x
-"$cxx" "-I$libbutl" -I. -DBUILD2_BOOTSTRAP '-DBUILD2_HOST_TRIPLET="'"$host"'"' -std=c++1y "$@" -o build2/b-boot $r -lpthread -ldl
+"$cxx" "-I$libbutl" -I. -DBUILD2_BOOTSTRAP '-DBUILD2_HOST_TRIPLET="'"$host"'"' -std=c++1y "$@" -o build2/b-boot $r -lpthread
diff --git a/libbuild2/module.cxx b/libbuild2/module.cxx
index 1feb121..b06b030 100644
--- a/libbuild2/module.cxx
+++ b/libbuild2/module.cxx
@@ -4,10 +4,12 @@
 
 #include <libbuild2/module.hxx>
 
-#ifndef _WIN32
-#  include <dlfcn.h>
-#else
-#  include <libbutl/win32-utility.hxx>
+#ifndef BUILD2_BOOTSTRAP
+#  ifndef _WIN32
+#    include <dlfcn.h>
+#  else
+#    include <libbutl/win32-utility.hxx>
+#  endif
 #endif
 
 #include <libbuild2/file.hxx>  // import()
@@ -76,6 +78,15 @@ namespace build2
                  << "supported";
     }
 
+    module_load_function* r (nullptr);
+
+    // No dynamic loading of build system modules during bootstrap.
+    //
+#ifdef BUILD2_BOOTSTRAP
+    if (!opt)
+      fail (loc) << "unknown build system module " << mod <<
+        info << "running bootstrap build system";
+#else
     path lib;
 
 #if 0
@@ -133,8 +144,6 @@ namespace build2
     // Note that we don't unload our modules since it's not clear what would
     // the benefit be.
     //
-    module_load_function* r (nullptr);
-
 #ifndef _WIN32
     // Use RTLD_NOW instead of RTLD_LAZY to both speed things up (we are going
     // to use this module now) and to detect any symbol mismatches.
@@ -167,6 +176,8 @@ namespace build2
                  << " (" << lib << "): " << win32::last_error_msg ();
 #endif
 
+#endif // BUILD2_BOOTSTRAP
+
     return r;
   }