From 98e556d3868b638a658f497af0b64ce04fc5287d Mon Sep 17 00:00:00 2001
From: Alexey Neyman <stilor@att.net>
Date: Mon, 11 Apr 2016 13:59:16 -0700
Subject: Support multilib in sh/uClibc.

Signed-off-by: Alexey Neyman <stilor@att.net>
---
 scripts/functions | 151 ++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 123 insertions(+), 28 deletions(-)

(limited to 'scripts/functions')

diff --git a/scripts/functions b/scripts/functions
index ef75e09e..f1dfd127 100644
--- a/scripts/functions
+++ b/scripts/functions
@@ -1366,25 +1366,6 @@ CT_DoBuildTargetTuple() {
     fi
 }
 
-# This function determines the target tuple for a given set of compiler
-# flags, using either GCC's multiarch feature (if supported; if not,
-# GCC prints nothing and exits with status 0), falling back to calling
-# the architecture-specific functions.
-CT_DoMultilibTarget() {
-    local target_var="$1"; shift
-    local -a multi_flags=( "$@" )
-    local gcc_multiarch
-
-    gcc_multiarch=$( "${CT_TARGET}-gcc" -print-multiarch "${multi_flags[@]}" )
-    if [ -n "${gcc_multiarch}" ]; then
-        eval "${target_var}=${gcc_multiarch}"
-        return
-    fi
-
-    # Fall back to arch-specific guesswork
-    CT_DoArchMultilibTarget "${target_var}" "${multi_flags[@]}"
-}
-
 # This function does pause the build until the user strikes "Return"
 # Usage: CT_DoPause [optional_message]
 CT_DoPause() {
@@ -1529,9 +1510,9 @@ CT_DoLoadState(){
 # This function sets a kconfig option to a specific value in a .config file
 # Usage: CT_KconfigSetOption <option> <value> <file>
 CT_KconfigSetOption() {
-    option="$1"
-    value="$2"
-    file="$3"
+    local option="$1"
+    local value="$2"
+    local file="$3"
 
     ${grep} -E -q "^${option}=.*" "${file}" && \
         ${sed} -i -r -e "s;^${option}=.*$;${option}=${value};" "${file}" || \
@@ -1543,8 +1524,8 @@ CT_KconfigSetOption() {
 # This function enables a kconfig option to '=y' in a .config file
 # Usage: CT_KconfigEnableOption <option> <file>
 CT_KconfigEnableOption() {
-    option="$1"
-    file="$2"
+    local option="$1"
+    local file="$2"
 
     CT_KconfigSetOption "${option}" "y" "${file}"
 }
@@ -1552,8 +1533,8 @@ CT_KconfigEnableOption() {
 # This function disables a kconfig option in a .config file
 # Usage: CT_KconfigDisableOption <option> <file>
 CT_KconfigDisableOption() {
-    option="${1}"
-    file="${2}"
+    local option="${1}"
+    local file="${2}"
 
     ${grep} -E -q "^# ${option} is not set$" "${file}" || \
     ${grep} -E -q "^${option}=.*$" "${file}" && \
@@ -1565,11 +1546,125 @@ CT_KconfigDisableOption() {
 # is set or commented out.
 # Usage: CT_KconfigDeleteOption <option> <file>
 CT_KconfigDeleteOption() {
-    option="${1}"
-    file="${2}"
+    local option="${1}"
+    local file="${2}"
 
     ${grep} -E -q "^# ${option} is not set$" "${file}" && \
         ${sed} -i -r -e "/^# ${option} is not set$/d" "${file}" || \
     ${grep} -E -q "^${option}=.*$" "${file}" && \
         ${sed} -i -r -e "/^${option}=.*$/d" "${file}" || true
 }
+
+# Multilib iterator. The caller should be in a directory where the directories
+# will be created, one per multilib, and the specified command will be run in
+# each of them. The following arguments will be passed to the invoked command:
+#   multi_flags   CFLAGS for this multilib
+#   multi_dir     GCC internal library location for the multilib
+#   multi_os_dir  OS library location for the multilib
+#   multi_root    Sysroot for this multilib
+#   multi_target  Target tuple, either as reported by GCC or by our guesswork
+#   multi_count   Total number of multilibs
+#   multi_index   Index of the current multilib
+# Any additional arguments passed to this function will be forwarded to the called
+# function as well.
+# Usage: CT_IterateMultilibs <function> <prefix> <additional-args...>
+CT_IterateMultilibs() {
+    local func="${1}"
+    local prefix="${2}"
+    local -a multilibs
+    local multi_dir multi_os_dir multi_root multi_flags multi_index multi_target
+    local root_suffix
+
+    # Name used internally below
+    if [ "${prefix}" = "sysroot-check" ]; then
+        CT_Abort "Bad prefix used in CT_IterateMultilibs"
+    fi
+
+    # Drop mandatory arguments
+    shift 2
+
+    # If gcc is not configured for multilib, it still prints a single line
+    # for the default settings
+    multilibs=( $("${CT_TARGET}-gcc" -print-multi-lib 2>/dev/null) )
+    CT_DoExecLog ALL rm -rf "sysroot-check"
+    for multilib in "${multilibs[@]}"; do
+        # GCC makes the distinction between:
+        #   multilib (-print-multi-lib or -print-multi-directory) and
+        #   multilib-os (--print-multi-os-directory)
+        # as the gcc library and gcc sysroot library paths, respectively.
+        # For example, on x86_64:
+        #   multilib:    -m32=32      -m64=.
+        #   multilib-os: -m32=../lib  -m64=../lib64
+        # Moreover, while some multilibs can coexist in the same sysroot (e.g.
+        # on x86), some have a "sysroot suffix" to separate incompatible variants.
+        # Such sysroot suffixes combine with multilib-os directories, e.g.
+        # on sh4 with -m4a multilib, the search order in sysroot is (dropping some
+        # directories for brevity:
+        #   <sysroot>/m4a/lib/m4a/
+        #   <sysroot>/m4a/usr/lib/m4a/
+        #   <sysroot>/m4a/lib/
+        #   <sysroot>/m4a/usr/lib/
+        # The problem is that while GCC itself is aware of these subtleties, the
+        # binutils (notably, ld) it invokes under the hood are not. For example,
+        # if a shared library libfoo.so.1 requires libbar.so.1, ld will only search
+        # for libbar.so.1 in <sysroot>/m4a/usr/lib, but not in <sysroot>/m4a/usr/lib/m4a.
+        # In other words, 'gcc -lfoo -lbar' will work for both the default and -m4a
+        # cases, and 'gcc -lfoo' will work for the default, but not for -m4a. To
+        # address this, we first try to determine if the sysroot alone makes the
+        # configuration sufficiently unique. If there are no multilibs within the
+        # same suffixed sysroot, we can drop the multi_os_dir and both gcc and ld
+        # will work. If not, we'll supply both multi_root/multi_os_dir (which will
+        # likely break later, e.g. while building final GCC with C++ support). But,
+        # we've done all we can.
+        multi_flags=$( echo "${multilib#*;}" | ${sed} -r -e 's/@/ -/g;' )
+        multi_dir="${multilib%%;*}"
+        multi_os_dir=$( "${CT_TARGET}-gcc" -print-multi-os-directory ${multi_flags} )
+        multi_root=$( "${CT_TARGET}-gcc" -print-sysroot ${multi_flags} )
+        root_suffix="${multi_root#${CT_SYSROOT_DIR}}"
+        CT_DoExecLog ALL mkdir -p "sysroot-check${root_suffix}"
+        if [ -e "sysroot-check${root_suffix}/seen" ]; then
+            CT_DoExecLog ALL rm -f "sysroot-check${root_suffix}/unique"
+        else
+            CT_DoExecLog ALL touch "sysroot-check${root_suffix}/seen" \
+                "sysroot-check${root_suffix}/unique"
+        fi
+    done
+
+    # Now, actual iteration.
+    # This uses either GCC's multiarch feature (if supported; if not,
+    # GCC prints nothing and exits with status 0), falling back to calling
+    # the architecture-specific functions.
+    multi_index=1
+    for multilib in "${multilibs[@]}"; do
+        multi_flags=$( echo "${multilib#*;}" | ${sed} -r -e 's/@/ -/g;' )
+        multi_dir="${multilib%%;*}"
+        multi_os_dir=$( "${CT_TARGET}-gcc" -print-multi-os-directory ${multi_flags} )
+        multi_root=$( "${CT_TARGET}-gcc" -print-sysroot ${multi_flags} )
+        multi_target=$( "${CT_TARGET}-gcc" -print-multiarch ${multi_flags} )
+        root_suffix="${multi_root#${CT_SYSROOT_DIR}}"
+
+        # If GCC did not report the target tuple (i.e. this configuration is not
+        # multiarch-capable), fall back to our guesswork.
+        if [ -z "${multi_target}" ]; then
+            multi_target="${CT_TARGET}"
+            CT_DoArchMultilibTarget multi_target ${multi_flags}
+        fi
+
+        # Avoid multi_os_dir if it's the only directory in this sysroot.
+        if [ -e "sysroot-check${root_suffix}/unique" ]; then
+            multi_os_dir=.
+        fi
+
+        CT_mkdir_pushd "${prefix}_${multi_dir//\//_}"
+        $func multi_dir="${multi_dir}"       \
+              multi_os_dir="${multi_os_dir}" \
+              multi_flags="${multi_flags}"   \
+              multi_root="${multi_root}"     \
+              multi_target="${multi_target}" \
+              multi_index="${multi_index}"   \
+              multi_count="${#multilibs[@]}" \
+              "$@"
+        CT_Popd
+        multi_index=$((multi_index+1))
+    done
+}
-- 
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