[Bug bootstrap/53913] New: [4.8 regression] resource.c:1179:5: error: 'current_function_decl' undeclared broke m68k bootstrap

["mikpe at it dot uu.se" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53913

             Bug #: 53913
           Summary: [4.8 regression] resource.c:1179:5: error:
                    'current_function_decl' undeclared broke m68k
                    bootstrap
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: bootstrap
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: mikpe@it.uu.se


Attempting to build gcc-4.8-20120708 for m68k-linux fails with:

gcc -c   -g -O2 -DIN_GCC -DCROSS_DIRECTORY_STRUCTURE  -W -Wall -Wwrite-strings
-Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wmissing-format-attribute
-pedantic -Wno-long-long -Wno-variadic-macros -Wno-overlength-strings
-Wold-style-definition -Wc++-compat   -DHAVE_CONFIG_H -I. -I.
-I/tmp/gcc-4.8-20120708/gcc -I/tmp/gcc-4.8-20120708/gcc/.
-I/tmp/gcc-4.8-20120708/gcc/../include
-I/tmp/gcc-4.8-20120708/gcc/../libcpp/include
-I/home/mikpe/pkgs/linux-x86_64/gmp-5.0.5/include
-I/home/mikpe/pkgs/linux-x86_64/mpfr-3.1.1/include
-I/home/mikpe/pkgs/linux-x86_64/mpc-0.9/include 
-I/tmp/gcc-4.8-20120708/gcc/../libdecnumber
-I/tmp/gcc-4.8-20120708/gcc/../libdecnumber/dpd -I../libdecnumber   
/tmp/gcc-4.8-20120708/gcc/resource.c -o resource.o
/tmp/gcc-4.8-20120708/gcc/resource.c: In function 'init_resource_info':
/tmp/gcc-4.8-20120708/gcc/resource.c:1179:5: error: 'current_function_decl'
undeclared (first use in this function)
/tmp/gcc-4.8-20120708/gcc/resource.c:1179:5: note: each undeclared identifier
is reported only once for each function it appears in
make[2]: *** [resource.o] Error 1
make[2]: Leaving directory `/tmp/objdir/gcc'
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory `/tmp/objdir'
make: *** [all] Error 2

Line 1175 is the conditional occurrence of EPILOGUE_USES(i).  The m68k
definition of EPILOGUE_USES references current_function_decl, and apparently
nothing brings in the needed header (tree.h) to resource.c any more.

4.8-20120701 builds fine, so this is a recent regression.

Appending an #include "tree.h" to the include block at the start of resource.c
makes a cross-build work, but that may not be the preferred fix.