This hobbyist OS has already been added to `config.sub` (and
`config.guess` respectively) some time ago, but was still lacking
upstream support for building libraries using libtool.

Since it is a relatively up-to-date system with ports of modern
software, "adding support" mostly just means adding empty cases to avoid
falling though to the most basic behavior (that guarantees compatibility
at the expense of disabling everything that might be critical).

* m4/libtool.m4: Add support for SerenityOS.
---
 m4/libtool.m4 | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/m4/libtool.m4 b/m4/libtool.m4
index 66b12b5a..f2ef36bb 100644
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -2999,6 +2999,17 @@ rdos*)
   dynamic_linker=no
   ;;

+serenity*)
+  version_type=linux # correct to gnu/linux during the next big refactor
+  need_lib_prefix=no
+  need_version=no
+  library_names_spec='$libname$release$shared_ext$versuffix 
$libname$release$shared_ext$major $libname$shared_ext'
+  soname_spec='$libname$release$shared_ext$major'
+  shlibpath_var=LD_LIBRARY_PATH
+  shlibpath_overrides_runpath=no
+  dynamic_linker='SerenityOS LibELF'
+  ;;
+
 solaris*)
   version_type=linux # correct to gnu/linux during the next big refactor
   need_lib_prefix=no
@@ -3595,6 +3606,10 @@ rdos*)
   lt_cv_deplibs_check_method=pass_all
   ;;

+serenity*)
+  lt_cv_deplibs_check_method=pass_all
+  ;;
+
 solaris*)
   lt_cv_deplibs_check_method=pass_all
   ;;
@@ -4469,6 +4484,8 @@ m4_if([$1], [CXX], [
        ;;
       psos*)
        ;;
+      serenity*)
+        ;;
       solaris*)
        case $cc_basename in
          CC* | sunCC*)
@@ -4811,6 +4828,9 @@ m4_if([$1], [CXX], [
       _LT_TAGVAR(lt_prog_compiler_static, $1)='-non_shared'
       ;;

+    serenity*)
+      ;;
+
     solaris*)
       _LT_TAGVAR(lt_prog_compiler_pic, $1)='-KPIC'
       _LT_TAGVAR(lt_prog_compiler_static, $1)='-Bstatic'
@@ -5917,6 +5937,9 @@ _LT_EOF
       _LT_TAGVAR(hardcode_libdir_separator, $1)=:
       ;;

+    serenity*)
+      ;;
+
     solaris*)
       _LT_TAGVAR(no_undefined_flag, $1)=' -z defs'
       if test yes = "$GCC"; then
@@ -7237,6 +7260,9 @@ if test yes != "$_lt_caught_CXX_error"; then
         _LT_TAGVAR(ld_shlibs, $1)=no
         ;;

+      serenity*)
+        ;;
+
       sunos4*)
         case $cc_basename in
           CC*)
--
2.44.0


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