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darwin: resolve rb symbols from ext by -flat_namespace to see libruby transitively

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This repairs the assumption, which many fat-gem maintainer expect, "An
extension built with --disable-shared Ruby is loadable from
--enable-shared Ruby".

By default all references resolved to a dynamic library use "two-level
namespace", which record the library name and symbol name for each
resolution entry. On the other hand, `-flat_namespace` discards the
library name information and resolves symbols "flatly".
This behavior is useful for us to ignore which image (`ruby`
executable or `libruby.dylib`) provides rb symbols at runtime.
This commit is contained in:
Yuta Saito 2022-12-23 13:58:45 +09:00
parent 9c1f03a38a
commit c5eefb7f37
Notes: git 2022-12-23 08:45:45 +00:00 
Merged: https://github.com/ruby/ruby/pull/7008
1 changed files with 4 additions and 9 deletions
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13
configure.ac
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@ -3053,14 +3053,9 @@ AC_SUBST(EXTOBJS)
: ${LDFLAGS=""}
: ${LIBPATHENV=DYLD_FALLBACK_LIBRARY_PATH}
: ${PRELOADENV=DYLD_INSERT_LIBRARIES}
AS_IF([test x"$enable_shared" = xyes], [
# Resolve symbols from libruby.dylib when --enable-shared
EXTDLDFLAGS='$(LIBRUBYARG_SHARED)'
], [test "x$EXTSTATIC" = x], [
# When building exts as bundles, a mach-o bundle needs to know its loader
# program to bind symbols from the ruby executable
EXTDLDFLAGS="-bundle_loader '\$(BUILTRUBY)'"
])
# When building exts as bundles, a mach-o bundle needs to know its loader
# program to bind symbols from the ruby executable
EXTDLDFLAGS="-bundle_loader '\$(BUILTRUBY)' -Wl,-flat_namespace"
rb_cv_dlopen=yes],
[aix*], [ : ${LDSHARED='$(CC)'}
AS_IF([test "$GCC" = yes], [
@ -3354,7 +3349,7 @@ AS_IF([test x"$cross_compiling" = xyes], [
AC_SUBST(XRUBY_RUBYLIBDIR)
AC_SUBST(XRUBY_RUBYHDRDIR)
PREP='$(arch)-fake.rb'
AS_CASE(["$enable_shared:$EXTSTATIC:$target_os"], [no::darwin*], [
AS_CASE(["$target_os"], [darwin*], [
# darwin target requires miniruby for linking ext bundles
PREP="$PREP"' miniruby$(EXEEXT)'
])