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-rw-r--r--libbuild2/cc/module.cxx27
1 files changed, 20 insertions, 7 deletions
diff --git a/libbuild2/cc/module.cxx b/libbuild2/cc/module.cxx
index 70624a2..cf6c6e4 100644
--- a/libbuild2/cc/module.cxx
+++ b/libbuild2/cc/module.cxx
@@ -57,7 +57,7 @@ namespace build2
// config.x
//
- strings mode;
+ strings omode; // Original mode.
{
// Normally we will have a persistent configuration and computing the
// default value every time will be a waste. So try without a default
@@ -141,19 +141,31 @@ namespace build2
fail << "invalid path '" << s << "' in " << config_x;
}
- mode.assign (++v.begin (), v.end ());
+ omode.assign (++v.begin (), v.end ());
// Save original path/mode in *.config.path/mode.
//
rs.assign (x_c_path) = xc;
- rs.assign (x_c_mode) = mode;
+ rs.assign (x_c_mode) = omode;
+
+ // Merge the configured mode options into user-specified (which must
+ // be done before loading the *.guess module).
+ //
+ // In particular, this ability to specify the compiler mode in a
+ // buildfile is useful in embedded development where the project may
+ // need to hardcode things like -target, -nostdinc, etc.
+ //
+ const strings& mode (cast<strings> (rs.assign (x_mode) += omode));
// Figure out which compiler we are dealing with, its target, etc.
//
// Note that we could allow guess() to modify mode to support
// imaginary options (such as /MACHINE for cl.exe). Though it's not
// clear what cc.mode would contain (original or modified). Note that
- // we are now folding *.std options into mode options.
+ // we are now adding *.std options into mode options.
+ //
+ // @@ But can't the language standard options alter things like search
+ // directories?
//
x_info = &build2::cc::guess (
ctx,
@@ -222,9 +234,10 @@ namespace build2
// Assign values to variables that describe the compiler.
//
+ // Note: x_mode is dealt with above.
+ //
rs.assign (x_path) = process_path_ex (
xi.path, x_name, xi.checksum, env_checksum);
- const strings& xm (cast<strings> (rs.assign (x_mode) = move (mode)));
rs.assign (x_id) = xi.id.string ();
rs.assign (x_id_type) = to_string (xi.id.type);
@@ -282,8 +295,8 @@ namespace build2
if (!xi.pattern.empty ())
h.assign ("config.cc.pattern") = xi.pattern;
- if (!xm.empty ())
- h.assign ("config.cc.mode") = xm;
+ if (!omode.empty ())
+ h.assign ("config.cc.mode") = move (omode);
h.assign (c_runtime) = xi.runtime;
h.assign (c_stdlib) = xi.c_stdlib;