cmake: don't force gcc, use more general cc/c++

pkgs/development/tools/build-managers/cmake/default.nix

@@ -86,8 +86,8 @@ stdenv.mkDerivation rec {
     ++ ["--"]
     ++ optionals (!useNcurses) [ "-DBUILD_CursesDialog=OFF" ]
     ++ optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
-      "-DCMAKE_CXX_COMPILER=${stdenv.cc.targetPrefix}g++"
-      "-DCMAKE_C_COMPILER=${stdenv.cc.targetPrefix}gcc"
+      "-DCMAKE_CXX_COMPILER=${stdenv.cc.targetPrefix}c++"
+      "-DCMAKE_C_COMPILER=${stdenv.cc.targetPrefix}cc"
       "-DCMAKE_AR=${getBin stdenv.cc.bintools.bintools}/bin/${stdenv.cc.targetPrefix}ar"
       "-DCMAKE_RANLIB=${getBin stdenv.cc.bintools.bintools}/bin/${stdenv.cc.targetPrefix}ranlib"
       "-DCMAKE_STRIP=${getBin stdenv.cc.bintools.bintools}/bin/${stdenv.cc.targetPrefix}strip"

pkgs/development/tools/build-managers/cmake/setup-hook.sh

@@ -37,8 +37,8 @@ cmakeConfigurePhase() {
         # Unfortunately cmake seems to expect absolute paths for ar, ranlib, and
         # strip. Otherwise they are taken to be relative to the source root of
         # the package being built.
-        cmakeFlags="-DCMAKE_CXX_COMPILER=$crossConfig-g++ $cmakeFlags"
-        cmakeFlags="-DCMAKE_C_COMPILER=$crossConfig-gcc $cmakeFlags"
+        cmakeFlags="-DCMAKE_CXX_COMPILER=$crossConfig-c++ $cmakeFlags"
+        cmakeFlags="-DCMAKE_C_COMPILER=$crossConfig-cc $cmakeFlags"
         cmakeFlags="-DCMAKE_AR=$(command -v $crossConfig-ar) $cmakeFlags"
         cmakeFlags="-DCMAKE_RANLIB=$(command -v $crossConfig-ranlib) $cmakeFlags"
         cmakeFlags="-DCMAKE_STRIP=$(command -v $crossConfig-strip) $cmakeFlags"