gdb: link executables with libtoolusers/jemarch/gdb-libtool

This patch changes the GDB build system in order to use libtool to
link the several built executables.  This makes it possible to refer
to libtool libraries (.la files) in CLIBS.

As an application of the above,

  BFD              now refers to ../libbfd/libbfd.la
  OPCODES          now refers to ../opcodes/libopcodes.la
  LIBBACKTRACE_LIB now refers to ../libbacktrace/libbacktrace.la
  LIBCTF           now refers to ../libctf/libctf.la

NOTE1: The addition of libtool adds a few new configure-time options
       to GDB.  Among these, --enable-shared and --disable-shared, which were
       previously ignored.  Now GDB shall honor these options when linking,
       picking up the right version of the referred libtool libraries
       automagically.

NOTE2: I have not tested the insight build.

NOTE3: For regenerating configure I used an environment with Autoconf
       2.69 and Automake 1.15.1.  This should match the previously
       used version as announced in the configure script.

NOTE4: Now the installed shared object libbfd.so is used by gdb
       if binutils is installed with --enable-shared.

Testing performed:

- --enable-shared and --disable-shared (the default in binutils) work
  as expected: the linked executables link with the archive or shared
  libraries transparently.

- Makefile.in modified for EXEEXT = .exe.  It installs the binaries
  just fine.  The installed gdb.exe runs fine.

- Native build regtested in x86_64. The installed gdb runs fine.

  In the regression testing I'm observing that the following tests
  doesn't seem to be deterministic:

    gdb.base/step-over-syscall.exp
    gdb.threads/process-dies-while-detaching.exp
    gdb.threads/process-dies-while-handling-bp.exp

  Sometimes some of the the tests in these files unexpectedly fail,
  like in:

  -PASS: gdb.threads/process-dies-while-detaching.exp: single-process: \
         continue: detach: continue
  +FAIL: gdb.threads/process-dies-while-detaching.exp: single-process: \
         continue: detach: continue

  Sometimes they unexpectedly pass:

  -KFAIL: gdb.base/step-over-syscall.exp: clone: displaced=on: \
          check_pc_after_cross_syscall: single step over clone \
          final pc (PRMS: gdb/19675)
  +PASS: gdb.base/step-over-syscall.exp: clone: displaced=on: \
         check_pc_after_cross_syscall: single step over clone final pc

  -KFAIL: gdb.threads/process-dies-while-handling-bp.exp: \
          non_stop=on: cond_bp_target=0: inferior 1 exited \
          (prompt) (PRMS: gdb/18749)
  +PASS: gdb.threads/process-dies-while-handling-bp.exp: \
          non_stop=on: cond_bp_target=0: inferior 1 exited

- Cross build for aarch64-linux-gnu built to exercise
  program_transform_name and friends.  The installed
  aarch64-linux-gnu-gdb runs fine.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29372

1 files changed, 8 insertions, 9 deletions

diff --git a/gdb/configure.ac b/gdb/configure.ac
index fceb80e..12561d4 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -19,7 +19,7 @@ dnl along with this program.  If not, see <http://www.gnu.org/licenses/>.
 dnl Process this file with autoconf to produce a configure script.
 
 AC_INIT
-AC_CONFIG_MACRO_DIRS([../config])
+AC_CONFIG_MACRO_DIRS([.. ../config])
 AC_CONFIG_SRCDIR([main.c])
 AC_CONFIG_HEADERS(config.h:config.in, [echo > stamp-h])
 AM_MAINTAINER_MODE
@@ -46,6 +46,10 @@ ACX_NONCANONICAL_TARGET
 
 AC_ARG_PROGRAM
 
+# We require libtool to link with the in-tree libtool libraries
+# the proper way.
+LT_INIT
+
 # We require a C++11 compiler.  Check if one is available, and if
 # necessary, set CXX_DIALECT to some -std=xxx switch.
 AX_CXX_COMPILE_STDCXX(11, , mandatory)
@@ -2092,7 +2096,7 @@ AC_ARG_ENABLE([libbacktrace],
 
 if test "${enable_libbacktrace}" = "yes"; then
   LIBBACKTRACE_INC="-I$srcdir/../libbacktrace/ -I../libbacktrace/"
-  LIBBACKTRACE_LIB=../libbacktrace/.libs/libbacktrace.a
+  LIBBACKTRACE_LIB=../libbacktrace/libbacktrace.la
   AC_DEFINE(HAVE_LIBBACKTRACE, 1, [Define if libbacktrace is being used.])
 else
   LIBBACKTRACE_INC=
@@ -2151,15 +2155,10 @@ AC_ARG_WITH(xxhash,
   [], [with_xxhash=auto])
 
 GCC_ENABLE([libctf], [yes], [], [Handle .ctf type-info sections])
-if test x${enable_static} = xno; then
-  LIBCTF="-Wl,--rpath,../libctf/.libs ../libctf/.libs/libctf.so"
-  CTF_DEPS="../libctf/.libs/libctf.so"
-else
-  LIBCTF="../libctf/.libs/libctf.a"
-  CTF_DEPS="$LIBCTF"
-fi
 if test "${enable_libctf}" = yes; then
   AC_DEFINE(ENABLE_LIBCTF, 1, [Handle .ctf type-info sections])
+  LIBCTF="../libctf/libctf.la"
+  CTF_DEPS="../libctf/libctf.la"
 else
   LIBCTF=
   CTF_DEPS=