Enable babeltrace compile-time feature.

gdb-babeltrace-configure.patch

@@ -0,0 +1,85 @@
+http://sourceware.org/ml/gdb-patches/2014-08/msg00045.html
+Subject: [patch] Fix --with-babeltrace with gcc-4.9.1
+
+
+--qMm9M+Fa2AknHoGS
+Content-Type: text/plain; charset=us-ascii
+Content-Disposition: inline
+
+Hi,
+
+when I tried to use --with-babeltrace on Fedora Rawhide x86_64
+using gcc-4.9.1-3.fc22.x86_64 I got:
+
+checking for libbabeltrace... no
+configure: error: babeltrace is missing or unusable
+Makefile:7973: recipe for target 'configure-gdb' failed
+
+configure:15890: checking for libbabeltrace
+configure:15918: gcc -o conftest -O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches  -m64 -mtune=generic   -Werror   -static-libstdc++ -static-libgcc -Wl,-z,relro    conftest.c -lselinux -lncurses -lz -lm  -ldl   /usr/lib64/libbabeltrace.so /usr/lib64/libbabeltrace-ctf.so >&5
+conftest.c: In function 'main':
+conftest.c:198:21: error: unused variable 'pos' [-Werror=unused-variable]
+ struct bt_iter_pos *pos = bt_iter_get_pos (bt_ctf_get_iter (NULL));
+                     ^
+cc1: all warnings being treated as errors
+configure:15918: $? = 1
+configure: failed program was:
+
+The patch below fixes it for me.
+
+In configure.ac there is above this check:
+  # Append -Werror to CFLAGS so that configure can catch the warning
+  # "assignment from incompatible pointer type", which is related to
+  # the babeltrace change from 1.0.3 to 1.1.0.  Babeltrace 1.1.0 works
+  # in GDB, while babeltrace 1.0.3 is broken.
+  # AC_LIB_HAVE_LINKFLAGS may modify CPPFLAGS in it, so it should be
+  # safe to save and restore CFLAGS here.
+  saved_CFLAGS=$CFLAGS
+  CFLAGS="$CFLAGS -Werror"
+
+Maybe it would be easier to use there:
+  CFLAGS="$CFLAGS -Werror -Wno-unused-variable"
+
+But maybe -Werror is cross-compiler compatible while -Wno-unused-variable is
+not, I have no idea.
+
+
+Jan
+
+--qMm9M+Fa2AknHoGS
+Content-Type: text/plain; charset=us-ascii
+Content-Disposition: inline; filename="gdb-babeltrace-configure.patch"
+
+gdb/
+2014-08-04  Jan Kratochvil  <jan.kratochvil@redhat.com>
+
+	* configure.ac (--with-babeltrace): Use 'pos'.
+	* configure: Regenerate.
+
+diff --git a/gdb/configure.ac b/gdb/configure.ac
+index 70d0964..07d2f00 100644
+--- a/gdb/configure.ac
++++ b/gdb/configure.ac
+@@ -2437,6 +2437,7 @@ else
+ 			struct bt_ctf_event *event = NULL;
+ 			const struct bt_definition *scope;
+ 
++			(void) pos; /* Prevent -Werror=unused-variable.  */
+ 			scope = bt_ctf_get_top_level_scope (event,
+ 			      				   BT_STREAM_EVENT_HEADER);
+ 		        bt_ctf_get_uint64 (bt_ctf_get_field (event, scope, "id"));
+diff --git a/gdb/configure b/gdb/configure
+index 809326a..b983d16 100755
+--- a/gdb/configure
++++ b/gdb/configure
+@@ -15344,6 +15344,7 @@ struct bt_iter_pos *pos = bt_iter_get_pos (bt_ctf_get_iter (NULL));
+ 			struct bt_ctf_event *event = NULL;
+ 			const struct bt_definition *scope;
+ 
++			(void) pos; /* Prevent -Werror=unused-variable.  */
+ 			scope = bt_ctf_get_top_level_scope (event,
+ 			      				   BT_STREAM_EVENT_HEADER);
+ 		        bt_ctf_get_uint64 (bt_ctf_get_field (event, scope, "id"));
+
+--qMm9M+Fa2AknHoGS--
+

gdb.spec

@@ -26,7 +26,7 @@ Version: 7.8
 
 # The release always contains a leading reserved number, start it at 1.
 # `upstream' is not a part of `name' to stay fully rpm dependencies compatible for the testing.
-Release: 15%{?dist}
+Release: 16%{?dist}
 
 License: GPLv3+ and GPLv3+ with exceptions and GPLv2+ and GPLv2+ with exceptions and GPL+ and LGPLv2+ and BSD and Public Domain and GFDL
 Group: Development/Debuggers
@@ -524,6 +524,9 @@ Patch921: gdb-python-completer-2of2.patch
 # Display Fortran strings in backtraces.
 Patch925: gdb-fortran-frame-string.patch
 
+# Fix -Werror=unused-variable error configuring babeltrace.
+Patch926: gdb-babeltrace-configure.patch
+
 %if 0%{!?rhel:1} || 0%{?rhel} > 6
 # RL_STATE_FEDORA_GDB would not be found for:
 # Patch642: gdb-readline62-ask-more-rh.patch
@@ -555,6 +558,9 @@ BuildRequires: texlive-collection-latexrecommended
 %endif
 # Permit rebuilding *.[0-9] files even if they are distributed in gdb-*.tar:
 BuildRequires: /usr/bin/pod2man
+%if 0%{!?rhel:1}
+BuildRequires: libbabeltrace-devel%{?_isa}
+%endif
 
 %if 0%{?_with_testsuite:1}
 
@@ -804,6 +810,7 @@ find -name "*.info*"|xargs rm -f
 %patch920 -p1
 %patch921 -p1
 %patch925 -p1
+%patch926 -p1
 
 %patch848 -p1
 %if 0%{!?el6:1}
@@ -891,6 +898,11 @@ export LDFLAGS="%{?__global_ldflags} %{?_with_asan:-fsanitize=address}"
 	--disable-sim						\
 	--disable-rpath						\
 	--without-guile						\
+%if 0%{!?rhel:1}
+	--with-babeltrace					\
+%else
+	--without-babeltrace					\
+%endif
 %if 0%{!?rhel:1} || 0%{?rhel} > 6
 	--with-system-readline					\
 %else
@@ -1294,6 +1306,9 @@ then
 fi
 
 %changelog
+* Mon Aug  4 2014 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.8-16.fc21
+- Enable babeltrace compile-time feature.
+
 * Sat Aug  2 2014 Jan Kratochvil <jan.kratochvil@redhat.com> - 7.8-15.fc21
 - Rebase to FSF GDB 7.8.
 - Display Fortran strings in backtraces.