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authorBoris Kolpackov <boris@codesynthesis.com>2019-11-04 15:11:01 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2019-11-04 15:16:13 +0200
commit56b860217eb00827ba15fc975f71008080af9b65 (patch)
tree882f39a7c228923363162eb17b6f1ac2db38adb4 /libbuild2
parentb39ce46b80ef5cccc592398e0a74ba8d02742ead (diff)
Add support for ~host special configuration name in config.import
This is the "default host configuration" that corresponds to how the build system itself was built. For example: $ b create: tools/,cc config.import=~host
Diffstat (limited to 'libbuild2')
-rw-r--r--libbuild2/buildfile25
-rw-r--r--libbuild2/config/host-config.cxx.in13
-rw-r--r--libbuild2/config/init.cxx42
3 files changed, 72 insertions, 8 deletions
diff --git a/libbuild2/buildfile b/libbuild2/buildfile
index 865bb91..325d54a 100644
--- a/libbuild2/buildfile
+++ b/libbuild2/buildfile
@@ -32,10 +32,29 @@ lib{build2}: cxx{utility-uninstalled}: for_install = false
# NOTE: remember to update import_modules() in libbuild2/modules.cxx if adding
# a new such module.
#
-for m: config dist install test
- libul{build2}: $m/{hxx ixx txx cxx}{** -**-options -**.test...}
+libul{build2}: config/{hxx ixx txx cxx}{** -host-config -**.test...} \
+ config/cxx{host-config}
-libul{build2}: test/script/{hxx ixx cxx}{builtin-options}
+# This will of course blow up spectacularly if we are cross-compiling. But
+# let's wait and enjoy the fireworks (and get a sense of why would someone
+# need to cross-compile a build system).
+#
+newline = '
+'
+config/cxx{host-config}: config/in{host-config}
+{
+ # Remove comment lines which could be confused by some lesser compilers with
+ # preprocessor directives.
+ #
+ host_config = $regex.replace($config.export(), "#.*$newline", '')
+}
+
+libul{build2}: dist/{hxx ixx txx cxx}{** -**.test...}
+
+libul{build2}: install/{hxx ixx txx cxx}{** -**.test...}
+
+libul{build2}: test/{hxx ixx txx cxx}{** -**-options -**.test...} \
+ test/script/{hxx ixx cxx}{builtin-options}
libul{build2}: $int_libs
diff --git a/libbuild2/config/host-config.cxx.in b/libbuild2/config/host-config.cxx.in
new file mode 100644
index 0000000..46cd912
--- /dev/null
+++ b/libbuild2/config/host-config.cxx.in
@@ -0,0 +1,13 @@
+// file : libbuild2/config/host-config.cxx.in -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+namespace build2
+{
+ namespace config
+ {
+ // This is a raw string literal, in case you are unfamiliar.
+ //
+ extern const char host_config[] = R"###($host_config$)###";
+ }
+}
diff --git a/libbuild2/config/init.cxx b/libbuild2/config/init.cxx
index cda34fa..2d4ed20 100644
--- a/libbuild2/config/init.cxx
+++ b/libbuild2/config/init.cxx
@@ -4,6 +4,8 @@
#include <libbuild2/config/init.hxx>
+#include <sstream>
+
#include <libbuild2/file.hxx>
#include <libbuild2/rule.hxx>
#include <libbuild2/lexer.hxx>
@@ -88,6 +90,10 @@ namespace build2
return true; // Initialize first (load config.build).
}
+#ifndef BUILD2_BOOTSTRAP
+ extern const char host_config[]; // host-config.cxx.in
+#endif
+
bool
init (scope& rs,
scope&,
@@ -124,7 +130,9 @@ namespace build2
// config.import (we don't need to worry about disfigure since we will
// never be init'ed).
//
- auto load_config = [&rs, &c_v] (const path& f, const location& l)
+ auto load_config = [&rs, &c_v] (istream& is,
+ const path& f,
+ const location& l)
{
// Check the config version. We assume that old versions cannot
// understand new configs and new versions are incompatible with old
@@ -141,8 +149,7 @@ namespace build2
// that we won't have the config.version variable entered in the scope
// but that is harmless (we could do it manually if necessary).
//
- ifdstream ifs;
- lexer lex (open_file_or_stdin (f, ifs), f);
+ lexer lex (is, f);
// Assume missing version is 0.
//
@@ -160,11 +167,17 @@ namespace build2
source (rs, rs, lex);
};
+ auto load_config_file = [&load_config] (const path& f, const location& l)
+ {
+ ifdstream ifs;
+ load_config (open_file_or_stdin (f, ifs), f, l);
+ };
+
{
path f (config_file (rs));
if (exists (f))
- load_config (f, l);
+ load_config_file (f, l);
}
if (lookup l = rs[c_i])
@@ -182,7 +195,26 @@ namespace build2
if (l.belongs (rs) || l.belongs (rs.ctx.global_scope))
{
for (const path& f: cast<paths> (l))
- load_config (f, location (&f));
+ {
+ location l (&f);
+
+ const string& s (f.string ());
+
+ if (s[0] != '~')
+ load_config_file (f, l);
+ else if (s == "~host")
+ {
+#ifdef BUILD2_BOOTSTRAP
+ assert (false);
+#else
+ istringstream is (host_config);
+ load_config (is, f, l);
+#endif
+ }
+ else
+ fail << "unknown special configuration name '" << s << "' in "
+ << "config.import";
+ }
}
}