Interrogate the compiler for the system path

[builder.git] / source / gnucompiler.cpp

diff --git a/source/gnucompiler.cpp b/source/gnucompiler.cpp
index ea04fbeacfb79ca92f444b8b374b68f592477271..8d0bca7c6470cc229ee02874ab9ec04f4620c2ce 100644 (file)
--- a/source/gnucompiler.cpp
+++ b/source/gnucompiler.cpp
@@ -1,6 +1,4 @@
 #include <msp/core/maputils.h>
-#include <msp/fs/dir.h>
-#include <msp/fs/stat.h>
 #include <msp/fs/utils.h>
 #include <msp/strings/format.h>
 #include <msp/strings/utils.h>
@@ -54,14 +52,7 @@ GnuCompiler::GnuCompiler(Builder &b, const Architecture &a, const string &t, con
        set_command((tag=="CXX" ? "g++" : "gcc"), true);
 
        if(!sysroot.empty())
-       {
                build_info.sysroot = sysroot;
-               system_path.push_back(sysroot/"usr/include");
-       }
-       else if(architecture->is_native())
-               system_path.push_back("/usr/include");
-       else
-               system_path.push_back("/usr/"+architecture->get_cross_prefix()+"/include");
 }
 
 Target *GnuCompiler::create_source(const Component &comp, const FS::Path &path) const
@@ -116,24 +107,42 @@ void GnuCompiler::do_prepare()
        {
                ExternalTask::Arguments argv;
                argv.push_back(executable->get_path().str());
-               argv.push_back("-dumpversion");
+               argv.push_back("-Wp,-v");
+               argv.push_back("-E");
+               if(tag=="CXX")
+                       argv.push_back("-xc++");
+               const FS::Path &sysroot = build_info.sysroot;
+               if(!sysroot.empty())
+                       argv.push_back("--sysroot="+sysroot.str());
+               argv.push_back("-");
 
+               string prog = FS::basename(executable->get_path());
                builder.get_logger().log("auxcommands", format("Running %s", join(argv.begin(), argv.end())));
                try
                {
-                       version = strip(ExternalTask::run_and_capture_output(argv));
-                       builder.get_logger().log("tools", format("%s version is %s", FS::basename(executable->get_path()), version));
-
-                       if(tag=="CXX")
+                       string output = ExternalTask::run_and_capture_output(argv, FS::Path(), true);
+                       string::size_type start = 0;
+                       bool record_path = false;
+                       while(start<output.size())
                        {
-                               const FS::Path &sysroot = build_info.sysroot;
-                               FS::Path cxx_path = sysroot/"usr"/"include"/"c++"/version;
-                               if(FS::is_dir(cxx_path))
-                                       system_path.push_back(cxx_path);
+                               string::size_type newline = output.find('\n', start);
+                               if(!output.compare(start, 34, "#include <...> search starts here:"))
+                                       record_path = true;
+                               else if(!output.compare(start, 19, "End of search list."))
+                                       record_path = false;
+                               else if(record_path)
+                               {
+                                       FS::Path path = strip(output.substr(start, newline-start));
+                                       builder.get_logger().log("tools", format("Got %s (%s) system path: %s", prog, tag, path));
+                                       system_path.push_back(path);
+                               }
+                               start = newline+1;
                        }
                }
-               catch(const runtime_error &)
-               { }
+               catch(const runtime_error &e)
+               {
+                       problems.push_back("Unable to determine system path");
+               }
        }
 }