[PATCH 2 of 2] complibs: do not force use of non-vital companion libraries

["Yann E. MORIN" <yann dot morin dot 1998 at anciens dot enib dot fr>]

# HG changeset patch
# User "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
# Date 1284074171 -7200
# Node ID b803abafb63d6b869c5ec6de142a75aaaf3ed2ad
# Parent  9a0470c96928832f97366bde032fba78f95586f1
complibs: do not force use of non-vital companion libraries

While GMP and MPFR are required to build the frontends, the
other libs are not. If they are present then gcc will enable
advanced features; if they are missing, then gcc will simply
disable those features.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

diff --git a/config/cc/gcc.in b/config/cc/gcc.in
--- a/config/cc/gcc.in
+++ b/config/cc/gcc.in
@@ -136,13 +136,22 @@
     bool
     default n
     select CC_GCC_4_3_or_later
-    select CC_GCC_USE_PPL_CLOOG
+    select CC_GCC_HAS_GRAPHITE
 
 config CC_GCC_4_5_or_later
     bool
     default n
     select CC_GCC_4_4_or_later
-    select CC_GCC_USE_MPC_LIBELF
+    select CC_GCC_USE_MPC
+    select CC_GCC_HAS_LTO
+
+config CC_GCC_HAS_GRAPHITE
+    bool
+    default n
+
+config CC_GCC_HAS_LTO
+    bool
+    default n
 
 config CC_GCC_USE_GMP_MPFR
     bool
@@ -156,10 +165,14 @@
     select PPL
     select CLOOG
 
-config CC_GCC_USE_MPC_LIBELF
+config CC_GCC_USE_MPC
     bool
     default n
     select MPC
+
+config CC_GCC_USE_LIBELF
+    bool
+    default n
     select LIBELF
 
 config CC_VERSION
diff --git a/config/cc/gcc.in.2 b/config/cc/gcc.in.2
--- a/config/cc/gcc.in.2
+++ b/config/cc/gcc.in.2
@@ -7,6 +7,33 @@
       
       This will compile crossgcc's libs with -Os.
 
+config CC_GCC_USE_GRAPHITE
+    bool
+    prompt "Enable GRAPHITE loop optimisations"
+    default y
+    depends on CC_GCC_HAS_GRAPHITE
+    select CC_GCC_USE_PPL_CLOOG
+    help
+      Enable the GRAPHITE loop optimsations.
+      
+      This requires the PPL and CLooG companion libraries, and
+      those will be automatically build for you.
+      
+      On some systems (eg. Cygwin), PPL and/or CLooG may not
+      build properly (yet), so you'll have to say 'N' here.
+
+config CC_GCC_USE_LTO
+    bool
+    prompt "Enable LTO"
+    default y
+    depends on CC_GCC_HAS_LTO
+    select CC_GCC_USE_LIBELF
+    help
+      Enable the Link Time Optimisations.
+      
+      This will require the libelf companion library, and it
+      wil be build automatically for you.
+
 config CC_STATIC_LIBSTDCXX
     bool
     prompt "Link libstdc++ statically into the gcc binary"



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