Missing -llzma in libunwind.pc

liblzuma used in decoding MiniDebuginfo is not listed in
libunwind.pc.

Changes in version 2 of patch:

* Don't check HAVE_LZMA. It is redundant.
* Make liblzma as private libraries in use.

Both are suggested by Mike Frysinger <vapier@gentoo.org>.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>

configure.ac

@@ -255,19 +255,21 @@ if test x$enable_msabi_support = xyes; then
 fi
 AC_MSG_RESULT([$enable_msabi_support])
 
+LIBLZMA=
 AC_MSG_CHECKING([whether to support LZMA-compressed symbol tables])
 AC_ARG_ENABLE(minidebuginfo,
 AS_HELP_STRING([--enable-minidebuginfo], [Enables support for LZMA-compressed symbol tables]),, [enable_minidebuginfo=auto])
 AC_MSG_RESULT([$enable_minidebuginfo])
 if test x$enable_minidebuginfo != xno; then
    AC_CHECK_LIB([lzma], [lzma_mf_is_supported],
-   [AC_SUBST([LIBLZMA], [-lzma])
+   [LIBLZMA=-llzma
     AC_DEFINE([HAVE_LZMA], [1], [Define if you have liblzma])
     enable_minidebuginfo=yes],
    [if test x$enable_minidebuginfo = xyes; then
       AC_MSG_FAILURE([liblzma not found])
     fi])
 fi
+AC_SUBST([LIBLZMA])
 AM_CONDITIONAL(HAVE_LZMA, test x$enable_minidebuginfo = xyes)
 
 LIBUNWIND___THREAD

src/Makefile.am

@@ -611,9 +611,7 @@ endif
 libunwind_la_LDFLAGS =	$(COMMON_SO_LDFLAGS) -XCClinker -nostdlib \
 			$(LDFLAGS_STATIC_LIBCXA) -version-info $(SOVERSION)
 libunwind_la_LIBADD  += -lc $(LIBCRTS)
-if HAVE_LZMA
- libunwind_la_LIBADD += -llzma
-endif
+libunwind_la_LIBADD += $(LIBLZMA)
 
 AM_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/include/tdep-$(arch) -I.
 AM_CCASFLAGS = $(AM_CPPFLAGS)

src/unwind/libunwind.pc.in

@@ -7,4 +7,5 @@ Name: libunwind
 Description: libunwind base library
 Version: @VERSION@
 Libs: -L${libdir} -lunwind
+Libs.private: @LIBLZMA@
 Cflags: -I${includedir}