Explicitly mention yet-unloaded shared libraries in location spec examples

[binutils-gdb.git] / libctf / configure.ac

diff --git a/libctf/configure.ac b/libctf/configure.ac
index 80644b89d67a9ba50076fbf87661a9447c153344..4996edd5b70fdfa7ebd1908e9f735ff1bbb069b9 100644 (file)
--- a/libctf/configure.ac
+++ b/libctf/configure.ac
@@ -1,7 +1,7 @@
 dnl                                            -*- Autoconf -*-
 dnl Process this file with autoconf to produce a configure script.
 dnl
-dnl   Copyright (C) 2019-2021 Free Software Foundation, Inc.
+dnl   Copyright (C) 2019-2022 Free Software Foundation, Inc.
 dnl
 dnl This file is free software; you can redistribute it and/or modify
 dnl it under the terms of the GNU General Public License as published by
@@ -29,6 +29,7 @@ AC_CANONICAL_HOST
 AC_CANONICAL_TARGET
 AC_USE_SYSTEM_EXTENSIONS
 AM_INIT_AUTOMAKE
+AM_SILENT_RULES([yes])
 
 # Checks for programs.
 AC_PROG_MAKE_SET
@@ -173,6 +174,30 @@ if test $ac_cv_libctf_macro_O_CLOEXEC = yes; then
            [Whether the platform has a definition of O_CLOEXEC.])
 fi
 
+build_info=
+makeinfo_too_old=
+AC_CHECK_PROGS([MAKEINFO], makeinfo, [$MISSING makeinfo])
+case " $build_configdirs " in
+  *" texinfo "*) MAKEINFO='$$r/$(BUILD_SUBDIR)/texinfo/makeinfo/makeinfo' ;;
+esac
+changequote(,)
+    # We require texinfo to be 6.3 or later, for a working synindex
+    # and validatemenus: otherwise we fall back to /bin/true.
+    if ${MAKEINFO} --version \
+       | egrep 'texinfo[^0-9]*(6\.[3-9]|[7-9][0-9])' >/dev/null 2>&1; then
+      build_info=yes
+    else
+        build_info=
+        makeinfo_too_old=t
+    fi
+changequote([,])
+if test -n "$makeinfo_too_old"; then
+    AC_MSG_WARN([
+*** Makeinfo is too old. Info documentation will not be built.])
+fi
+AC_SUBST(MAKEINFO)
+AM_CONDITIONAL(BUILD_INFO, test "${build_info}" = yes)
+
 CTF_LIBADD="-L`pwd`/../libiberty -liberty"
 SHARED_LDFLAGS=
 
@@ -219,11 +244,51 @@ fi`
 AM_CONDITIONAL(TCL_TRY, test "${ac_cv_libctf_tcl_try}" = yes)
 
 # Use a version script, if possible, or an -export-symbols-regex otherwise.
-VERSION_FLAGS='-export-symbols-regex ctf_.*'
-if $LD --help 2>&1 | grep -- --version-script >/dev/null; then
-    VERSION_FLAGS="-Wl,--version-script='$srcdir/libctf.ver'"
+decommented_version_script=
+AC_CACHE_CHECK([for linker versioning flags], [ac_cv_libctf_version_script],
+  [echo 'FOO { global: mai*; local: ctf_fo*; };' > conftest.ver
+   old_LDFLAGS="$LDFLAGS"
+   old_CFLAGS="$CFLAGS"
+   LDFLAGS="$LDFLAGS -shared -Wl,--version-script=conftest.ver"
+   CFLAGS="$CFLAGS -fPIC"
+   AC_LINK_IFELSE([AC_LANG_SOURCE([[int ctf_foo (void) { return 0; }
+                                   int main (void) { return ctf_foo(); }]])],
+                 [ac_cv_libctf_version_script="-Wl,--version-script='$srcdir/libctf.ver'"],
+                 [])
+   LDFLAGS="$old_LDFLAGS"
+
+   if test -z "$ac_cv_libctf_version_script"; then
+     LDFLAGS="$LDFLAGS -shared -Wl,-B,local -Wl,-z,gnu-version-script=conftest.ver"
+     AC_LINK_IFELSE([AC_LANG_SOURCE([[int ctf_foo (void) { return 0; }
+                                     int main (void) { return ctf_foo(); }]])],
+                   [ac_cv_libctf_version_script="-Wl,-B,local -Wl,-z,gnu-version-script"
+                    decommented_version_script=t],
+                   [])
+     LDFLAGS="$old_LDFLAGS"
+   fi
+   CFLAGS="$old_CFLAGS"
+
+   if test -z "$ac_cv_libctf_version_script"; then
+     ac_cv_libctf_version_script='-export-symbols-regex ctf_.*'
+   fi
+   rm -f conftest.ver])
+if test -n "$decommented_version_script"; then
+   # Solaris's version scripts use shell-style comments rather than the C-style
+   # used by GNU ld.  Use cpp to strip the comments out.  (cpp exists under this
+   # name on all platforms that support ld -z gnu-version-script.)
+   # Also ensure that no symbols exist in the version script for libctf-nobfd.so
+   # that do not exist in the shared library itself, since some linkers add such
+   # symbols with type NOTYPE.
+   /lib/cpp < $srcdir/libctf.ver > libctf-decommented.ver
+   grep -v 'libctf only' $srcdir/libctf.ver | /lib/cpp > libctf-nobfd-decommented.ver
+   VERSION_FLAGS="$ac_cv_libctf_version_script='libctf-decommented.ver'"
+   VERSION_FLAGS_NOBFD="$ac_cv_libctf_version_script='libctf-nobfd-decommented.ver'"
+else
+   VERSION_FLAGS="$ac_cv_libctf_version_script"
+   VERSION_FLAGS_NOBFD="$ac_cv_libctf_version_script"
 fi
 AC_SUBST(VERSION_FLAGS)
+AC_SUBST(VERSION_FLAGS_NOBFD)
 
 AC_CONFIG_FILES(Makefile)
 AC_CONFIG_HEADERS(config.h)