[Bug ada/42073] New: Infinite loop when parsing a project file, alpha only

[ludovic at ludovic-brenta dot org]

On alpha-linux-gnu, gnatmake enters an infinite loop consuming 100% CPU while
parsing this project file:

project GNADE_Common_Build is

   Soversion := External ("soversion");

   type Lib_Type is ("static", "dynamic");

   Libtype : Lib_Type := external ("LIBTYPE");

   for Languages use ("Ada");

   --  At install time, Source_Dirs must reflect the build source
   --  directories
   for Source_Dirs use ("../support");

   --  Library_Dir must be a single directory containing all the
   --  library files (*.ali, *.a, *.so) for all of the gnade packages.
   for Library_Dir use "tmp";

   --  Object_Dir is only used at build time; it must be distinct from
   --  the other package object directories, and from the library
   --  directory.
   for Object_Dir use "tmp/common-" & Libtype;

   for Library_Name use "gnadecommon";
   for Library_Kind use Libtype;

   --  Library_Version is not used when Library_Kind is "static"
   for Library_Version use "libgnadecommon.so." & Soversion;

   package Compiler is
      for Default_Switches ("Ada") use
        ("-g",
         "-O2",
         "-gnat05",
         "-gnatfno",
         "-gnatwa",
         "-gnatVa",
         "-fstack-check");
   end Compiler;

end GNADE_Common_Build;

Steps to reproduce:
$ gnatmake -p -j1 -vP2 -Pdebian/gnade_common_build -XLIBTYPE=static 
-Xsoversion=1 -v
GPR_PROJECT_PATH=".:/usr/share/ada/adainclude/"
Project_Path_Name_Of ("debian/gnade_common_build",
"/home/lbrenta/gnade-1.6.2/");
   Trying /home/lbrenta/gnade-1.6.2//debian/gnade_common_build.gpr
Project_Name_From ("/home/lbrenta/gnade-1.6.2/debian/gnade_common_build.gpr")
(infinite loop)

gnatmake works with the same project file on all architectures I tried:
{amd64,hppa,i386,ia64,mips,mipsel,powerpc,s390,sparc}-linux-gnu, so this looks
like a code generation bug that affects gnatmake.

I have access to an alpha-linux-gnu machine, please tell me if I can help
narrow this problem down.


-- 
           Summary: Infinite loop when parsing a project file, alpha only
           Product: gcc
           Version: 4.4.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ada
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ludovic at ludovic-brenta dot org
 GCC build triplet: alpha-linux-gnu
  GCC host triplet: alpha-linux-gnu
GCC target triplet: alpha-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42073