From 5171b3033a6dc20bf120256abeb5c732f93077a0 Mon Sep 17 00:00:00 2001
From: Alexey Brodkin <abrodkin@synopsys.com>
Date: Fri, 19 Feb 2021 18:44:02 +0300
Subject: newlib-nano: Create symlinks for nano-suffixed libs

If existing board's .specs are used for linking of a user's application,
then instead of normally used libs like libc.a & libstdc++.a might be
requested their "nano"-suffixed siblings: libc_nano.a, libstdc++_nano etc.

That way:
----------------------------->8---------------------------
%rename link_gcc_c_sequence	myboard_link_gcc_c_sequence

*myboard_libc:
%{!specs=nano.specs:-lc} %{specs=nano.specs:-lc_nano}

*link_gcc_c_sequence:
%(myboard_link_gcc_c_sequence) --start-group %G %(myboard_libc) --end-group
----------------------------->8---------------------------

Our companion newlib-nano libs are all built optimized for size, so we'd like
to use them for linking. But given linker will see "-lc_nano -lstdc++_nano"
on its command line non-suffixed libs will be ignored.

To solve it we create those "_nano"-suffixed libraries as simple symlinks to
existing libs..

Fixes https://github.com/crosstool-ng/crosstool-ng/issues/1458.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

diff --git a/scripts/build/companion_libs/350-newlib_nano.sh b/scripts/build/companion_libs/350-newlib_nano.sh
index 00ea948..28992c0 100644
--- a/scripts/build/companion_libs/350-newlib_nano.sh
+++ b/scripts/build/companion_libs/350-newlib_nano.sh
@@ -22,6 +22,31 @@ do_newlib_nano_extract() {
     CT_ExtractPatch NEWLIB_NANO
 }
 
+# Some architectures assume "nano" libs co-exist with normal ones
+# in the same folder, though being suffixed with "_nano".
+do_nano_libc_symlinks() {
+    CT_Pushd "${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/lib/${multi_dir}"
+
+    CT_DoLog DEBUG "Installing nano libc symlinks in $PWD"
+
+    ln -s libc.a libc_nano.a
+    ln -s libm.a libm_nano.a
+    ln -s libg.a libg_nano.a
+
+    CT_Popd
+}
+
+do_nano_libstdcxx_symlinks() {
+    CT_Pushd "${CT_PREFIX_DIR}/newlib-nano/${CT_TARGET}/lib/${multi_dir}"
+
+    CT_DoLog DEBUG "Installing nano libstdc++ symlinks in $PWD"
+
+    ln -s libstdc++.a libstdc++_nano.a
+    ln -s libsupc++.a libsupc++_nano.a
+
+    CT_Popd
+}
+
 #------------------------------------------------------------------------------
 # Build an additional target libstdc++ with "-Os" (optimise for speed) option
 # flag for libstdc++ "newlib_nano" variant.
@@ -59,6 +84,10 @@ do_cc_libstdcxx_newlib_nano()
         CT_DoStep INFO "Installing libstdc++ newlib-nano"
         CT_mkdir_pushd "${CT_BUILD_DIR}/build-cc-libstdcxx-newlib-nano"
         "${final_backend}" "${final_opts[@]}"
+
+        # Create "nano" symlinks for libstdc++.a & libsup++.a
+        CT_IterateMultilibs do_nano_libstdcxx_symlinks libstdcxx_symlinks
+
         CT_Popd
 
         CT_EndStep
@@ -180,6 +209,9 @@ ENABLE_TARGET_OPTSPACE:target-optspace
 
 EOF
 
+    # Create "nano" symlinks for libc.a, libg.a & libm.a
+    CT_IterateMultilibs do_nano_libc_symlinks libc_symlinks
+
     CT_Popd
     CT_EndStep
 
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