configure: use XC_LIBTOOL for portability across libtool versions

configure.ac

@@ -198,48 +198,19 @@ CURL_CONFIGURE_REENTRANT
 dnl check for how to do large files
 AC_SYS_LARGEFILE
 
-dnl support building of Windows DLLs
-AC_LIBTOOL_WIN32_DLL
+XC_LIBTOOL
 
-dnl force libtool to build static libraries with PIC on AMD64-Linux & FreeBSD
-AC_MSG_CHECKING([if arch-OS host is AMD64-Linux/FreeBSD (to build static libraries with PIC)])
-case $host in
-  x86_64*linux*|amd64*freebsd*|ia64*freebsd*)
-    AC_MSG_RESULT([yes])
-    with_pic=yes
-    ;;
-  *)
-    AC_MSG_RESULT([no])
-    ;;
-esac
+#
+# Automake conditionals based on libtool related checks
+#
 
-AC_MSG_CHECKING([if compiler is icc (to build with PIC)])
-case $CC in
-  icc | */icc)
-    AC_MSG_RESULT([yes])
-    with_pic=yes
-    ;;
-  *)
-    AC_MSG_RESULT([no])
-    ;;
-esac
+AM_CONDITIONAL([CURL_LT_SHLIB_USE_VERSION_INFO],
+  [test "x$xc_lt_shlib_use_version_info" = 'xyes'])
+AM_CONDITIONAL([CURL_LT_SHLIB_USE_NO_UNDEFINED],
+  [test "x$xc_lt_shlib_use_no_undefined" = 'xyes'])
+AM_CONDITIONAL([CURL_LT_SHLIB_USE_MIMPURE_TEXT],
+  [test "x$xc_lt_shlib_use_mimpure_text" = 'xyes'])
 
-dnl libtool setup
-AC_PROG_LIBTOOL
-
-AC_MSG_CHECKING([if we need -mimpure-text])
-mimpure=no
-case $host in
-  *-*-solaris2*)
-    if test "$GCC" = "yes"; then
-      mimpure="yes"
-    fi
-    ;;
-  *)
-    ;;
-esac
-AC_MSG_RESULT($mimpure)
-AM_CONDITIONAL(MIMPURE, test x$mimpure = xyes)
 
 AC_MSG_CHECKING([if we need BUILDING_LIBCURL])
 use_cppflag_building_libcurl="no"
@@ -311,9 +282,6 @@ CURL_CHECK_COMPILER_ARRAY_SIZE_NEGATIVE
 CURL_CHECK_COMPILER_PROTOTYPE_MISMATCH
 CURL_CHECK_COMPILER_SYMBOL_HIDING
 
-CURL_CHECK_NO_UNDEFINED
-AM_CONDITIONAL(NO_UNDEFINED, test x$need_no_undefined = xyes)
-
 CURL_CHECK_CURLDEBUG
 AM_CONDITIONAL(CURLDEBUG, test x$want_curldebug = xyes)
 
@@ -2613,8 +2581,10 @@ AC_MSG_RESULT(no)
 ]
 )
 
-AC_SUBST(VERSIONED_FLAVOUR, ["$versioned_symbols_flavour"])
-AM_CONDITIONAL(VERSIONED_SYMBOLS, test "x$versioned_symbols" = "xyes")
+AC_SUBST([CURL_LT_SHLIB_VERSIONED_FLAVOUR],
+  ["$versioned_symbols_flavour"])
+AM_CONDITIONAL([CURL_LT_SHLIB_USE_VERSIONED_SYMBOLS],
+  [test "x$versioned_symbols" = 'xyes'])
 
 dnl -------------------------------------------------
 dnl check winidn option before other IDN libraries

lib/Makefile.am

@@ -73,6 +73,9 @@ AM_CPPFLAGS = -I$(top_builddir)/include/curl \
               -I$(top_srcdir)/lib
 endif
 
+# Prevent LIBS from being used for all link targets
+LIBS = $(BLANK_AT_MAKETIME)
+
 # Mostly for Windows build targets, when building libcurl library
 if USE_CPPFLAG_BUILDING_LIBCURL
 AM_CPPFLAGS += -DBUILDING_LIBCURL
@@ -111,25 +114,25 @@ endif
 #
 # For the full guide on libcurl ABI rules, see docs/libcurl/ABI
 
-if NO_UNDEFINED
-# The -no-undefined flag is crucial to build fine on some platforms
-UNDEF = -no-undefined
+libcurl_la_LDFLAGS_EXTRA =
+
+if CURL_LT_SHLIB_USE_VERSION_INFO
+libcurl_la_LDFLAGS_EXTRA += $(VERSIONINFO)
 endif
 
-if MIMPURE
-# This is for gcc on Solaris (8+ ?) to avoid "relocations remain against
-# allocatable but non-writable sections" problems.
-MIMPURE = -mimpure-text
+if CURL_LT_SHLIB_USE_NO_UNDEFINED
+libcurl_la_LDFLAGS_EXTRA += -no-undefined
 endif
 
-if VERSIONED_SYMBOLS
-VERSIONED_SYMBOLS = -Wl,--version-script=libcurl.vers
+if CURL_LT_SHLIB_USE_MIMPURE_TEXT
+libcurl_la_LDFLAGS_EXTRA += -mimpure-text
 endif
 
-# Prevent LIBS from being used for all link targets
-LIBS = $(BLANK_AT_MAKETIME)
+if CURL_LT_SHLIB_USE_VERSIONED_SYMBOLS
+libcurl_la_LDFLAGS_EXTRA += -Wl,--version-script=libcurl.vers
+endif
 
-libcurl_la_LDFLAGS = $(UNDEF) $(VERSIONINFO) $(MIMPURE) $(VERSIONED_SYMBOLS) $(LIBCURL_LIBS)
+libcurl_la_LDFLAGS = $(AM_LDFLAGS) $(libcurl_la_LDFLAGS_EXTRA) $(LIBCURL_LIBS)
 
 if DOING_CURL_SYMBOL_HIDING
 libcurl_la_CPPFLAGS = $(AM_CPPFLAGS) -DCURL_HIDDEN_SYMBOLS

lib/libcurl.vers.in

@@ -6,7 +6,7 @@ HIDDEN
     _save*;
 };
 
-CURL_@VERSIONED_FLAVOUR@4
+CURL_@CURL_LT_SHLIB_VERSIONED_FLAVOUR@4
 {
   global: curl_*;
   local: *;

m4/curl-compilers.m4

@@ -21,7 +21,7 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 65
+# serial 66
 
 
 dnl CURL_CHECK_COMPILER
@@ -1195,6 +1195,7 @@ dnl library or as a shared one on those systems on which
 dnl shared libraries support undefined symbols.
 
 AC_DEFUN([CURL_CHECK_CURLDEBUG], [
+  AC_REQUIRE([XC_LIBTOOL])dnl
   AC_REQUIRE([CURL_SHFUNC_SQUEEZE])dnl
   supports_curldebug="unknown"
   if test "$want_curldebug" = "yes"; then
@@ -1210,7 +1211,7 @@ AC_DEFUN([CURL_CHECK_CURLDEBUG], [
     fi
     if test "$supports_curldebug" != "no"; then
       if test "$enable_shared" = "yes" &&
-        test "$need_no_undefined" = "yes"; then
+        test "x$xc_lt_shlib_use_no_undefined" = 'xyes'; then
         supports_curldebug="no"
         AC_MSG_WARN([shared library does not support undefined symbols.])
       fi
@@ -1238,31 +1239,6 @@ AC_DEFUN([CURL_CHECK_CURLDEBUG], [
 ])
 
 
-dnl CURL_CHECK_NO_UNDEFINED
-dnl -------------------------------------------------
-dnl Checks if the -no-undefined flag must be used when
-dnl building shared libraries. This is required on all
-dnl systems on which shared libraries should not have
-dnl references to undefined symbols. This check should
-dnl not be done before AC-PROG-LIBTOOL.
-
-AC_DEFUN([CURL_CHECK_NO_UNDEFINED], [
-  AC_BEFORE([$0],[CURL_CHECK_CURLDEBUG])dnl
-  AC_MSG_CHECKING([if shared libraries need -no-undefined])
-  need_no_undefined="no"
-  case $host in
-    *-*-cygwin* | *-*-mingw* | *-*-pw32* | *-*-cegcc* | *-*-aix*)
-      need_no_undefined="yes"
-      ;;
-  esac
-  if test "x$allow_undefined" = "xno"; then
-    need_no_undefined="yes"
-  elif test "x$allow_undefined_flag" = "xunsupported"; then
-    need_no_undefined="yes"
-  fi
-  AC_MSG_RESULT($need_no_undefined)
-])
-
 
 dnl CURL_CHECK_COMPILER_HALT_ON_ERROR
 dnl -------------------------------------------------

tests/libtest/Makefile.am

@@ -88,16 +88,18 @@ else
 noinst_LTLIBRARIES =
 endif
 
-if NO_UNDEFINED
-# The -no-undefined flag is crucial to build fine on some platforms
-UNDEF = -no-undefined
+libhostname_la_LDFLAGS_EXTRA = -module -avoid-version -rpath /nowhere
+
+if CURL_LT_SHLIB_USE_NO_UNDEFINED
+libhostname_la_LDFLAGS_EXTRA += -no-undefined
 endif
 
+libhostname_la_LDFLAGS = $(AM_LDFLAGS) $(libhostname_la_LDFLAGS_EXTRA)
+
 libhostname_la_SOURCES = sethostname.c sethostname.h
 
 libhostname_la_LIBADD =
 libhostname_la_DEPENDENCIES =
-libhostname_la_LDFLAGS = -module -avoid-version $(UNDEF) -rpath /nowhere
 
 if DOING_CURL_SYMBOL_HIDING
 libhostname_la_CPPFLAGS = $(AM_CPPFLAGS) -DCURL_HIDDEN_SYMBOLS