component/gcc: workaround to compile gcc on Olimex board

Gcc fails to recognize hard-float kernel on Olimex-Lime2 board.

For that reason gcc is automatically compiled using soft-float
convention and causes a failure.

component/gcc/buildout.cfg

@@ -33,6 +33,9 @@ configure-options =
   --with-ld=@@LOCATION@@/bin/ld
   --with-as=${binutils:location}/bin/as
   --with-internal-zlib
+  ${:extra-configure-options}
+extra-configure-options =
+
 post-install =
   cd '%(location)s/bin'
   ln -s gcc cc
@@ -54,6 +57,12 @@ environment =
   LDFLAGS=-Wl,-rpath=${gmp:location}/lib -Wl,-rpath=${isl:location}/lib -Wl,-rpath=${mpc:location}/lib -Wl,-rpath=${mpfr:location}/lib
   PATH=${binutils:location}/bin:${gettext:location}/bin:${perl:location}/bin:${tar:location}/bin:%(PATH)s
 
+[gcc-common:os.path.isdir('/usr/lib/arm-linux-gnueabihf') and os.access('/proc/device-tree/model', os.R_OK) and 'OLinuXino-LIME2' in open('/proc/device-tree/model').read()]
+extra-configure-options =
+  --with-arch=armv7-a
+  --with-fpu=vfp
+  --with-float=hard
+
 [gcc-5.5]
 <= gcc-common
 version = 5.5.0