Uses upstream gdb master (temporarily 2015-07-01 source - see PKGBUILD comments. As closely as possible matches core's gcc-5.1.0-5 build process.

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+# $Id$
+# Original Core Repo
+# ==================
+# Maintainer: Allan McRae <allan@archlinux.org>
+
+# Modifications to Use Git Master Source
+# ======================================
+# Maintainer: James Harvey <jamespharvey20@gmail.com>
+#    * This PKGBUILD as closely as possible matches core's gcc 5.1.0-5
+#    * Builds from git commit 12dcc3b7 (2015-07-01 02:15:32 UTC), rather than master, because after that the default standard changes, causing many errors
+#    * The volumous test suite failures ("UNRESOLVED:", "FAIL:") occur during building core's 5.1.0-5, so the problem is upstream from here
+#    * Core's 5.1.0-5 pr65882.patch is omitted, because it is git commit 1774df35
+#    * Core's 5.1.0-5 pr66647.patch is omitted, because it is git commit fa4f365b
+#    * gcc.libstdc++-v3.python.dot.fix.patch is added, to fix an accidentical misnaming of gdb.py
+#    * Addition of zlib and libmpc depends, due to new /usr/lib/gcc/x86_64-unknown-linux-gnu/6.0.0/gnat1
+#    * All namcap warnings are identical, as of 6.0.0.r139654.12dcc3b, except:
+#       * Error of a missing custom license directory of /usr/share/licenses/gcc*-git
+#       * Symlink /usr/lib/bfd-plugins/liblto_plugin.so points to non-existing /usr/lib/gcc/x86_64-unknown-linux-gnu/6.0.0.r139654.12dcc3b/liblto_plugin.so
+#    * _pkgver_base is hard coded at the moment to 6.0.0; can't parse from source at that point
+
+# toolchain build order: linux-api-headers->glibc->binutils->gcc->binutils->glibc
+# NOTE: libtool requires rebuilt with each new gcc version
+
+pkgname=('gcc-git' 'gcc-libs-git' 'gcc-fortran-git' 'gcc-objc-git' 'gcc-ada-git' 'gcc-go-git')
+_pkgname=gcc
+pkgver=6.0.0.r139654.12dcc3b
+_pkgver_base=6.0.0
+_pkgver=6
+# Bug report upstream.  As of 2015-07-07, gcc master is incompatible with isl ver 0.15, starting with compilation errors in gcc/graphite-poly.h
+_islver=0.14.1
+pkgrel=1
+
+pkgdesc="The GNU Compiler Collection (developmental version)"
+arch=('i686' 'x86_64')
+license=('GPL' 'LGPL' 'FDL' 'custom')
+url="http://gcc.gnu.org"
+depends=('zlib', 'libmpc')
+makedepends=('binutils>=2.25' 'libmpc' 'gcc-ada' 'doxygen' 'git')
+checkdepends=('dejagnu' 'inetutils')
+options=('!emptydirs')
+source=(git://gcc.gnu.org/git/gcc.git
+        http://isl.gforge.inria.fr/isl-${_islver}.tar.bz2
+        pr66035.patch
+        gcc.libstdc++-v3.python.dot.fix.patch)
+md5sums=('SKIP'
+         '118d1a379abf7606a3334c98a8411c79'
+         '5b980076cd5fcbc3aff6014f306282dd'
+         '7de06deb9ee0c10454219a319e62e4dc')
+
+_basedir=${_pkgname}
+
+_libdir="usr/lib/gcc/$CHOST/$_pkgver_base"
+
+pkgver() {
+  cd ${srcdir}/gcc
+  # new work needed for beyond this point, default standard changed
+  git checkout 12dcc3b7405a43e28010b2f5c186bf6f5f809397 > /dev/null 2>&1
+  echo $(cat gcc/BASE-VER).r$(git rev-list --count HEAD).$(git rev-parse --short HEAD)
+}
+
+prepare() {
+  cd ${srcdir}/${_basedir}
+
+  # link isl for in-tree build
+  ln -s ../isl-${_islver} isl
+
+  # Do not run fixincludes
+  sed -i 's@\./fixinc\.sh@-c true@' gcc/Makefile.in
+
+  # Arch Linux installs x86_64 libraries /lib
+  [[ $CARCH == "x86_64" ]] && sed -i '/m64=/s/lib64/lib/' gcc/config/i386/t-linux64
+
+  # hack! - some configure tests for header files using "$CPP $CPPFLAGS"
+  sed -i "/ac_cpp=/s/\$CPPFLAGS/\$CPPFLAGS -O2/" {libiberty,gcc}/configure
+
+  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66035
+  patch -p1 -i ${srcdir}/pr66035.patch
+
+  # Submitted upstream - Fixes misnaming of gdb.py file due to addition of libstdc++fs library
+  patch -p0 -i ${srcdir}/gcc.libstdc++-v3.python.dot.fix.patch
+
+  mkdir ${srcdir}/gcc-build
+}
+
+build() {
+  cd ${srcdir}/gcc-build
+
+  # using -pipe causes spurious test-suite failures
+  # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48565
+  CFLAGS=${CFLAGS/-pipe/}
+  CXXFLAGS=${CXXFLAGS/-pipe/}
+
+  ${srcdir}/${_basedir}/configure --prefix=/usr \
+      --libdir=/usr/lib --libexecdir=/usr/lib \
+      --mandir=/usr/share/man --infodir=/usr/share/info \
+      --with-bugurl=https://bugs.archlinux.org/ \
+      --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++ \
+      --enable-shared --enable-threads=posix --enable-libmpx \
+      --with-system-zlib --with-isl --enable-__cxa_atexit \
+      --disable-libunwind-exceptions --enable-clocale=gnu \
+      --disable-libstdcxx-pch --disable-libssp \
+      --enable-gnu-unique-object --enable-linker-build-id \
+      --enable-lto --enable-plugin --enable-install-libiberty \
+      --with-linker-hash-style=gnu --enable-gnu-indirect-function \
+      --disable-multilib --disable-werror \
+      --enable-checking=release \
+      --with-default-libstdcxx-abi=c++98
+
+  make
+  
+  # make documentation
+  make -C $CHOST/libstdc++-v3/doc doc-man-doxygen
+}
+
+check() {
+  cd ${srcdir}/gcc-build
+
+  # increase stack size to prevent test failures
+  # http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31827
+  ulimit -s 32768
+
+  # do not abort on error as some are "expected"
+  make -k check || true
+  ${srcdir}/${_basedir}/contrib/test_summary
+}
+
+package_gcc-libs-git()
+{
+  pkgdesc="Runtime libraries shipped by GCC (developmental version)"
+  groups=('base')
+  depends=('glibc>=2.21')
+  provides=('gcc-libs')
+  conflicts=('gcc-libs')
+  options=('!emptydirs' '!strip')
+  install=gcc-libs.install
+
+  cd ${srcdir}/gcc-build
+  
+  make -C $CHOST/libgcc DESTDIR=${pkgdir} install-shared
+  rm ${pkgdir}/${_libdir}/libgcc_eh.a
+  
+  for lib in libatomic \
+             libcilkrts \
+             libgfortran \
+             libgomp \
+             libitm \
+             libquadmath \
+             libsanitizer/{a,l,ub}san \
+             libstdc++-v3/src \
+             libvtv; do
+    make -C $CHOST/$lib DESTDIR=${pkgdir} install-toolexeclibLTLIBRARIES
+  done
+
+  [[ $CARCH == "x86_64" ]] && \
+    make -C $CHOST/libsanitizer/tsan DESTDIR=${pkgdir} install-toolexeclibLTLIBRARIES
+
+  make -C $CHOST/libobjc DESTDIR=${pkgdir} install-libs
+
+  make -C $CHOST/libstdc++-v3/po DESTDIR=${pkgdir} install
+
+  make -C $CHOST/libmpx DESTDIR=${pkgdir} install
+  rm ${pkgdir}/usr/lib/libmpx.spec
+
+  for lib in libgomp \
+             libitm \
+             libquadmath; do
+    make -C $CHOST/$lib DESTDIR=${pkgdir} install-info
+  done
+
+  # Install Runtime Library Exception
+  install -Dm644 ${srcdir}/${_basedir}/COPYING.RUNTIME \
+    ${pkgdir}/usr/share/licenses/gcc-libs/RUNTIME.LIBRARY.EXCEPTION
+}
+
+package_gcc-git()
+{
+  pkgdesc="The GNU Compiler Collection - C and C++ frontends (developmental version)"
+  depends=("gcc-libs-git=$pkgver-$pkgrel" 'binutils>=2.25' 'libmpc')
+  provides=('gcc')
+  conflicts=('gcc')
+  groups=('base-devel')
+  options=('staticlibs')
+  install=gcc.install
+
+  cd ${srcdir}/gcc-build
+
+  make -C gcc DESTDIR=${pkgdir} install-driver install-cpp install-gcc-ar \
+    c++.install-common install-headers install-plugin install-lto-wrapper
+
+  install -m755 -t $pkgdir/usr/bin/ gcc/gcov{,-tool}
+  install -m755 -t $pkgdir/${_libdir}/ gcc/{cc1,cc1plus,collect2,lto1}
+
+  make -C $CHOST/libgcc DESTDIR=${pkgdir} install
+  rm ${pkgdir}/usr/lib/libgcc_s.so*
+  
+  make -C $CHOST/libstdc++-v3/src DESTDIR=${pkgdir} install
+  make -C $CHOST/libstdc++-v3/include DESTDIR=${pkgdir} install
+  make -C $CHOST/libstdc++-v3/libsupc++ DESTDIR=${pkgdir} install
+  make -C $CHOST/libstdc++-v3/python DESTDIR=${pkgdir} install
+
+  make DESTDIR=${pkgdir} install-libcc1
+  install -d $pkgdir/usr/share/gdb/auto-load/usr/lib
+  mv $pkgdir/usr/lib/libstdc++.so.6.*-gdb.py \
+    $pkgdir/usr/share/gdb/auto-load/usr/lib/
+  rm ${pkgdir}/usr/lib/libstdc++.so*
+
+  make DESTDIR=${pkgdir} install-fixincludes
+  make -C gcc DESTDIR=${pkgdir} install-mkheaders
+  
+  make -C lto-plugin DESTDIR=${pkgdir} install
+  install -dm755 ${pkgdir}/usr/lib/bfd-plugins/
+  ln -s /usr/lib/gcc/$CHOST/${pkgver}/liblto_plugin.so \
+    ${pkgdir}/usr/lib/bfd-plugins/
+
+  make -C $CHOST/libcilkrts DESTDIR=${pkgdir} install-nodist_toolexeclibHEADERS \
+    install-nodist_cilkincludeHEADERS
+  make -C $CHOST/libgomp DESTDIR=${pkgdir} install-nodist_toolexeclibHEADERS \
+    install-nodist_libsubincludeHEADERS
+  make -C $CHOST/libitm DESTDIR=${pkgdir} install-nodist_toolexeclibHEADERS
+  make -C $CHOST/libquadmath DESTDIR=${pkgdir} install-nodist_libsubincludeHEADERS
+  make -C $CHOST/libsanitizer DESTDIR=${pkgdir} install-nodist_{saninclude,toolexeclib}HEADERS
+  make -C $CHOST/libsanitizer/asan DESTDIR=${pkgdir} install-nodist_toolexeclibHEADERS
+  make -C $CHOST/libmpx DESTDIR=${pkgdir} install-nodist_toolexeclibHEADERS
+
+  make -C libiberty DESTDIR=${pkgdir} install
+  # install PIC version of libiberty
+  install -m644 ${srcdir}/gcc-build/libiberty/pic/libiberty.a ${pkgdir}/usr/lib
+
+  make -C gcc DESTDIR=${pkgdir} install-man install-info
+  rm ${pkgdir}/usr/share/man/man1/{gccgo,gfortran}.1
+  rm ${pkgdir}/usr/share/info/{gccgo,gfortran,gnat-style,gnat_rm,gnat_ugn}.info
+
+  make -C libcpp DESTDIR=${pkgdir} install
+  make -C gcc DESTDIR=${pkgdir} install-po
+
+  # many packages expect this symlink
+  ln -s gcc ${pkgdir}/usr/bin/cc
+
+  # POSIX conformance launcher scripts for c89 and c99
+  cat > $pkgdir/usr/bin/c89 <<"EOF"
+#!/bin/sh
+fl="-std=c89"
+for opt; do
+  case "$opt" in
+    -ansi|-std=c89|-std=iso9899:1990) fl="";;
+    -std=*) echo "`basename $0` called with non ANSI/ISO C option $opt" >&2
+	    exit 1;;
+  esac
+done
+exec gcc $fl ${1+"$@"}
+EOF
+
+  cat > $pkgdir/usr/bin/c99 <<"EOF"
+#!/bin/sh
+fl="-std=c99"
+for opt; do
+  case "$opt" in
+    -std=c99|-std=iso9899:1999) fl="";;
+    -std=*) echo "`basename $0` called with non ISO C99 option $opt" >&2
+	    exit 1;;
+  esac
+done
+exec gcc $fl ${1+"$@"}
+EOF
+
+  chmod 755 $pkgdir/usr/bin/c{8,9}9
+
+  # install the libstdc++ man pages
+  make -C $CHOST/libstdc++-v3/doc DESTDIR=$pkgdir doc-install-man
+
+  # Install Runtime Library Exception
+  install -d ${pkgdir}/usr/share/licenses/gcc/
+  ln -s ../gcc-libs/RUNTIME.LIBRARY.EXCEPTION ${pkgdir}/usr/share/licenses/gcc/
+}
+
+package_gcc-fortran-git()
+{
+  pkgdesc="Fortran front-end for GCC (developmental version)"
+  depends=("gcc-git=$pkgver-$pkgrel")
+  provides=('gcc-fortran')
+  conflicts=('gcc-fortran')
+  options=('!emptydirs')
+  install=gcc-fortran.install
+
+  cd ${srcdir}/gcc-build
+  make -C $CHOST/libgfortran DESTDIR=$pkgdir install-{caf,my}execlibLTLIBRARIES \
+    install-{toolexeclibDATA,nodist_fincludeHEADERS}
+  make -C $CHOST/libgomp DESTDIR=$pkgdir install-nodist_fincludeHEADERS
+  make -C gcc DESTDIR=$pkgdir fortran.install-{common,man,info}
+  install -Dm755 gcc/f951 $pkgdir/${_libdir}/f951
+
+  ln -s gfortran ${pkgdir}/usr/bin/f95
+
+  # Install Runtime Library Exception
+  install -d ${pkgdir}/usr/share/licenses/gcc-fortran/
+  ln -s ../gcc-libs/RUNTIME.LIBRARY.EXCEPTION ${pkgdir}/usr/share/licenses/gcc-fortran/
+}
+
+package_gcc-objc-git()
+{
+  pkgdesc="Objective-C front-end for GCC (developmental version)"
+  depends=("gcc-git=$pkgver-$pkgrel")
+  provides=('gcc-objc')
+  conflicts=('gcc-objc')
+
+  cd ${srcdir}/gcc-build
+  make DESTDIR=$pkgdir -C $CHOST/libobjc install-headers
+  install -dm755 $pkgdir/${_libdir}
+  install -m755 gcc/cc1obj{,plus} $pkgdir/${_libdir}/
+
+  # Install Runtime Library Exception
+  install -d ${pkgdir}/usr/share/licenses/gcc-objc/
+  ln -s ../gcc-libs/RUNTIME.LIBRARY.EXCEPTION ${pkgdir}/usr/share/licenses/gcc-objc/
+}
+
+package_gcc-ada-git()
+{
+  pkgdesc="Ada front-end for GCC (GNAT) (developmental version)"
+  depends=("gcc-git=$pkgver-$pkgrel")
+  provides=('gcc-ada')
+  conflicts=('gcc-ada')
+  options=('staticlibs' '!emptydirs')
+  install=gcc-ada.install
+
+  cd ${srcdir}/gcc-build/gcc
+  make DESTDIR=$pkgdir ada.install-{common,info}
+  install -m755 gnat1 $pkgdir/${_libdir}
+
+  ln -s gcc ${pkgdir}/usr/bin/gnatgcc
+
+  # insist on dynamic linking, but keep static libraries because gnatmake complains
+  mv ${pkgdir}/${_libdir}/adalib/libgna{rl,t}-${_pkgver}.so ${pkgdir}/usr/lib
+  ln -s libgnarl-${_pkgver}.so ${pkgdir}/usr/lib/libgnarl.so
+  ln -s libgnat-${_pkgver}.so ${pkgdir}/usr/lib/libgnat.so
+  rm ${pkgdir}/${_libdir}/adalib/libgna{rl,t}.so
+
+  # Install Runtime Library Exception
+  install -d ${pkgdir}/usr/share/licenses/gcc-ada/
+  ln -s ../gcc-libs/RUNTIME.LIBRARY.EXCEPTION ${pkgdir}/usr/share/licenses/gcc-ada/
+}
+
+package_gcc-go-git()
+{
+  pkgdesc="Go front-end for GCC (developmental version)"
+  depends=("gcc-git=$pkgver-$pkgrel")
+  provides=('gcc-go')
+  conflicts=('go', 'gcc-go')
+  options=('!emptydirs')
+  install=gcc-go.install
+
+  cd ${srcdir}/gcc-build
+  make -C $CHOST/libgo DESTDIR=$pkgdir install-exec-am
+  make -C gcc DESTDIR=$pkgdir go.install-{common,man,info}
+  install -Dm755 gcc/go1 $pkgdir/${_libdir}/go1
+
+  make DESTDIR=${pkgdir} install-gotools
+
+  # Install Runtime Library Exception
+  install -d ${pkgdir}/usr/share/licenses/gcc-go/
+  ln -s ../gcc-libs/RUNTIME.LIBRARY.EXCEPTION ${pkgdir}/usr/share/licenses/gcc-go/
+}