Update GCC to 4.9.2

Update the GCC compiler to the 4.9.2 version.  It turns out that a C++
compiler is required to build the latest GCC releases, so build one in
stages 1 and 2 as well.

The updated list of GCC configuration options that either don't work in
a cross compiler or are not needed in a temporary compiler, were based
on the latest instructions from Linux From Scratch.

The inclusion of /lib64 in the lib path for the stage 1 linker is an
attempt to turn things more robust rather than to just symlink in /lib
stuff that ends up installed in /lib64 (as it is already being done for
libgcc_s.so).  Ideally, we should configure every chunk to install to
/lib, however GCC seems to not honour the `--with-libdir` configuration
flag.

With this version of GCC, it looks like a sysroot needs to be given at
configure time so that `--with-native-system-header-dir` does what it
claims to do.  Unfortunately, this has the side effect of making GCC not
passing to the linker the linker sysroot flag: `-Wl,--sysroot=$SYSROOT`.
The workaround is to modify LDFLAGS to give a sysroot directly to GCC,
`--sysroot=$SYSROOT`, which will then be further passed down to the
linker.

As the newest version of GCC finds more warnings than the previous one,
`-Werror` was disabled for the coreutils, GDB and Syslinux projects.
Syslinux's Makefile had to be patched, as it is not possible to disable
`-Werror` for all targets through the NO_WERROR variable.

The hack to handle libgcc_eh being required during eglibc's build was
removed, as it doesn't seem to be the case anymore.

1 files changed, 21 insertions, 8 deletions

diff --git a/strata/build-essential.morph b/strata/build-essential.morph
index 02b2043a..59f2b532 100644
--- a/strata/build-essential.morph
+++ b/strata/build-essential.morph
@@ -50,8 +50,8 @@ chunks:
 - name: stage1-gcc
   morph: strata/build-essential/stage1-gcc.morph
   repo: upstream:gcc-tarball
-  ref: 999c918a7ad32ad436395666def22ab90b3447fe
-  unpetrify-ref: baserock/build-essential
+  ref: b3c9b176c1f10ebeff5700eb3760e9511f23fa06
+  unpetrify-ref: baserock/tiagogomes/update-toolchain
   build-depends:
   - stage1-binutils
   build-mode: bootstrap
@@ -80,6 +80,18 @@ chunks:
   build-mode: bootstrap
   prefix: /tools
 
+- name: stage2-libstdc++
+  morph: strata/build-essential/stage2-libstdc++.morph
+  repo: upstream:gcc-tarball
+  ref: b3c9b176c1f10ebeff5700eb3760e9511f23fa06
+  unpetrify-ref: baserock/tiagogomes/update-toolchain
+  build-depends:
+  - stage1-binutils
+  - stage1-gcc
+  - stage2-glibc
+  build-mode: bootstrap
+  prefix: /tools
+
 - name: stage2-binutils
   morph: strata/build-essential/stage2-binutils.morph
   repo: upstream:binutils-redhat
@@ -95,8 +107,8 @@ chunks:
 - name: stage2-gcc-fixed-headers
   morph: strata/build-essential/stage2-gcc-fixed-headers.morph
   repo: upstream:gcc-tarball
-  ref: 999c918a7ad32ad436395666def22ab90b3447fe
-  unpetrify-ref: baserock/build-essential
+  ref: b3c9b176c1f10ebeff5700eb3760e9511f23fa06
+  unpetrify-ref: baserock/tiagogomes/update-toolchain
   build-depends:
   - stage1-binutils
   - stage1-gcc
@@ -107,13 +119,14 @@ chunks:
 - name: stage2-gcc
   morph: strata/build-essential/stage2-gcc.morph
   repo: upstream:gcc-tarball
-  ref: 999c918a7ad32ad436395666def22ab90b3447fe
-  unpetrify-ref: baserock/build-essential
+  ref: b3c9b176c1f10ebeff5700eb3760e9511f23fa06
+  unpetrify-ref: baserock/tiagogomes/update-toolchain
   build-depends:
   - stage1-binutils
   - stage1-gcc
   - stage2-glibc
   - stage2-gcc-fixed-headers
+  - stage2-libstdc++
   build-mode: bootstrap
   prefix: /tools
 
@@ -327,8 +340,8 @@ chunks:
 - name: gcc
   morph: strata/build-essential/gcc.morph
   repo: upstream:gcc-tarball
-  ref: 5c08cea34d5562dc828b85c7c02519246823aaf0
-  unpetrify-ref: baserock/build-essential-4.7
+  ref: b3c9b176c1f10ebeff5700eb3760e9511f23fa06
+  unpetrify-ref: baserock/tiagogomes/update-toolchain
   build-depends:
   - stage2-binutils
   - stage2-busybox