comptools/make: Install 'gmake' symlink

We had following problem: We're building a toolchain with an old glibc
version for compatibility with old Linux distributions (glibc 2.9). This
version requires make < 4 to build. However, the configure script of
glibc looks for make in the order "gnumake", "gmake" and "make". So when
"gmake" is available in the system (which is the case on Gentoo Linux
per default, unfortunately), then configure finds the system gmake 4.1
instead of the ct-ng make 3.82.

This patch adds an option to install a symlink so that 'gmake' is also
available in the old version when building toolchains.

Signed-off-by: Bernhard Walle <bernhard@bwalle.de>

config/companion_tools.in

@@ -35,6 +35,11 @@ config COMP_TOOLS_make
     bool
     prompt "make"
 
+config COMP_TOOLS_make_gmake
+    bool
+    prompt "Add gmake symlink to companion gnu/make"
+    depends on COMP_TOOLS_make
+
 config COMP_TOOLS_m4
     bool
     prompt "m4"

scripts/build/companion_tools/050-make.sh

@@ -22,6 +22,9 @@ do_companion_tools_make_build() {
                      --prefix="${CT_BUILDTOOLS_PREFIX_DIR}"
     CT_DoExecLog ALL make
     CT_DoExecLog ALL make install
+    if [ "${CT_COMP_TOOLS_make_gmake}" = "y" ]; then
+        CT_DoExecLog ALL ln -sv make "${CT_BUILDTOOLS_PREFIX_DIR}/bin/gmake"
+    fi
     CT_Popd
     CT_EndStep
 }