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[PATCH 2/2] Output information about buildable components


If argp is missing we build without tools and tests. We might also
make libasm optional in the future, as it is only used in maintainer
mode. A libelf-only build without libdw and the ebl backends is also
feasible.

The user should be notified about what is actually buildable with a
given configuration.

Signed-off-by: Ulf Hermann <ulf.hermann@qt.io>
---
 ChangeLog    |  5 +++++
 configure.ac | 16 +++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index e93d05f..e97e02b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2017-02-20  Ulf Hermann  <ulf.hermann@qt.io>
 
+	* configure.ac: Track which components are enabled and output
+	a summary in the end.
+
+2017-02-20  Ulf Hermann  <ulf.hermann@qt.io>
+
 	* configure.ac: Don't abort if no argp is found. Only print a
 	warning, rename have_argp to with_argp (like lzma, bzip2 ..),
 	and use "yes"/"no" as values, as we do for other variables.
diff --git a/configure.ac b/configure.ac
index 60b8796..ed60be5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -403,6 +403,7 @@ dnl Support library.
 AC_CONFIG_FILES([lib/Makefile])
 
 dnl ELF library.
+enable_libelf="yes"
 AC_CONFIG_FILES([libelf/Makefile])
 
 dnl Higher-level ELF support library.
@@ -412,6 +413,7 @@ dnl DWARF-ELF Lower-level Functions support library.
 AC_CONFIG_FILES([libdwelf/Makefile])
 
 dnl DWARF library.
+enable_libdw="yes"
 AC_CONFIG_FILES([libdw/Makefile])
 
 dnl Higher-level DWARF support library.
@@ -421,7 +423,8 @@ dnl CPU handling library.
 AC_CONFIG_FILES([libcpu/Makefile])
 
 dnl Assembler library.
-AM_CONDITIONAL(HAVE_LIBASM, true)dnl Used in tests/Makefile.am, which see.
+enable_libasm="yes"
+AM_CONDITIONAL(HAVE_LIBASM, test "x$enable_libasm" = "xyes")dnl Used in tests/Makefile.am, which see.
 AC_CONFIG_FILES([libasm/Makefile])
 
 dnl CPU-specific backend libraries.
@@ -433,11 +436,15 @@ AC_CONFIG_FILES([po/Makefile.in])
 AM_CONDITIONAL(STANDALONE, false)dnl Used in tests/Makefile.am, which see.
 if test "x$with_argp" = "xyes"; then
 	dnl Tools.
+	enable_tools="yes"
 	AC_CONFIG_FILES([src/Makefile])
 
 	dnl Test suite.
+	enable_tests="yes"
 	AC_CONFIG_FILES([tests/Makefile])
 else
+	enable_tools="no"
+	enable_tests="no"
 	AC_MSG_WARN("Not building tools or tests.")
 fi
 
@@ -580,4 +587,11 @@ AC_MSG_NOTICE([
     gcc undefined behaviour sanitizer  : ${use_undefined}
     use rpath in tests                 : ${tests_use_rpath}
     test biarch                        : ${utrace_cv_cc_biarch}
+
+  BUILDABLE COMPONENTS
+    libasm                             : ${enable_libasm}
+    libelf                             : ${enable_libelf}
+    libdw and ebl backends             : ${enable_libdw}
+    tools                              : ${enable_tools}
+    tests                              : ${enable_tests}
 ])
-- 
2.1.4


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