Patch gcc to support building under gcc 5

Note that as this patch modifies both the gperf and resulting header,
there is a possibility that Make will want to rebuild the header from
the gperf source, so we need to add gperf to our package listing.

.travis.yml

@@ -19,6 +19,7 @@ addons:
       - pkg-config
       - git
       - expect
+      - gperf
 cache:
   - apt
   - directories:

toolchain/patches/gcc-4.6.4.patch

@@ -107,3 +107,29 @@ diff -rupN original/gcc/gengtype.c new/gcc/gengtype.c
 
        newv = *v;
        newv.type = field_type;
+diff -rupN original/gcc/cp/cfns.h new/gcc/cp/cfns.h
+--- original/gcc/cp/cfns.h
++++ new/gcc/cp/cfns.h
+@@ -53,6 +53,9 @@ __inline
+ static unsigned int hash (const char *, unsigned int);
+ #ifdef __GNUC__
+  __inline
++#ifdef __GNUC_STDC_INLINE__
++__attribute__ ((__gnu_inline__))
++#endif
+ #endif
+ const char * libc_name_p (const char *, unsigned int);
+ /* maximum key range = 391, duplicates = 0 */
+diff -rupN original/gcc/cp/cfns.gperf new/gcc/cp/cfns.gperf
+--- original/gcc/cp/cfns.gperf
++++ new/gcc/cp/cfns.gperf
+@@ -22,6 +22,9 @@ __inline
+ static unsigned int hash (const char *, unsigned int);
+ #ifdef __GNUC__
+ __inline
++#ifdef __GNUC_STDC_INLINE__
++__attribute__ ((__gnu_inline__))
++#endif
+ #endif
+ const char * libc_name_p (const char *, unsigned int);
+ %}

toolchain/toolchain-build.sh

@@ -24,7 +24,7 @@ if [[ "$INSTALL_PACKAGES" == "true" ]] ; then
     echo "If you don't want to do this and you're sure you have all of the required system packages, then interrupt the password prompt and run this script again with -q."
 
     if [ -f /etc/debian_version ]; then
-        sudo apt-get install yasm genext2fs build-essential wget libmpfr-dev libmpc-dev libgmp3-dev qemu autoconf automake texinfo pkg-config git ctags
+        sudo apt-get install yasm genext2fs build-essential wget libmpfr-dev libmpc-dev libgmp3-dev qemu autoconf automake texinfo pkg-config git ctags gperf
     elif [ -f /etc/fedora-release ]; then
         sudo yum groupinstall 'Development Tools'
         sudo yum groupinstall 'Development Libraries'