First stab at multilib/uClibc.

Create a separate 'libc_backend_once', install headers into a
subdirectory (different sets of headers are installed for 32- and 64-bit
architectures), and create a symlink for the dynamic linker location
expected by GCC.

Signed-off-by: Alexey Neyman <stilor@att.net>

1 files changed, 37 insertions, 0 deletions

diff --git a/scripts/build/arch/x86.sh b/scripts/build/arch/x86.sh
index 4193278..9cd14a0 100644
--- a/scripts/build/arch/x86.sh
+++ b/scripts/build/arch/x86.sh
@@ -130,3 +130,40 @@ CT_DoArchUClibcConfig() {
             ;;
     esac
 }
+
+CT_DoArchUClibcCflags() {
+    local cfg="${1}"
+    local cflags="${2}"
+    local f
+
+    for f in ${cflags}; do
+        case "${f}" in
+            -m64)
+                CT_DoArchUClibcSelectArch "${cfg}" "x86_64"
+                ;;
+            -m32)
+                # Since it's a part of multilib with 64-bit flavor, default
+                # to new architecture (i686).
+                CT_DoArchUClibcSelectArch "${cfg}" "i386"
+                CT_KconfigDisableOption "CONFIG_386" "${cfg}"
+                CT_KconfigDisableOption "CONFIG_486" "${cfg}"
+                CT_KconfigDisableOption "CONFIG_586" "${cfg}"
+                CT_KconfigEnableOption "CONFIG_686" "${cfg}"
+                ;;
+            -mx32)
+                CT_Abort "uClibc does not support x32 ABI"
+                ;;
+        esac
+    done
+}
+
+CT_DoArchUClibcHeaderDir() {
+    local dir_var="${1}"
+    local cflags="${2}"
+
+    # If it is non-default multilib, add a suffix with architecture (reported by gcc)
+    # to the headers installation path.
+    if [ -n "${cflags}" ]; then
+        eval "${dir_var}="$( ${CT_TARGET}-gcc -print-multiarch ${cflags} )
+    fi
+}