sys-devel/gdb: link against tinfow first, then tinfo. bug #669096

In bug #669096 gdb was directly linked both
to libtinfo.so.6 and libncursesw.so.6:
    $ lddtree /usr/bin/gdb
    /usr/bin/gdb (interpreter => /lib64/ld-linux-x86-64.so.2)
    libtinfo.so.6 => /lib64/libtinfo.so.6
    libncursesw.so.6 => /lib64/libncursesw.so.6
        libtinfow.so.6 => /lib64/libtinfow.so.6
    ...
and caused gdb to SIGSEGV at start.

Let's consistently link against *w libraries when both available.

Note: the fix on it's own is not enough:
- we don't pass include paths to ncursesw libraries
- libreadline.so.7 is still linked against libtinfo.so.6 in Gentoo
  and needs a separate fix.

But it's enough to make immediate SIGSEGV to go away.

Reported-by: Michał Górny
Bug: https://bugs.gentoo.org/669096
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
Package-Manager: Portage-2.3.51, Repoman-2.3.11

1 files changed, 44 insertions, 0 deletions

diff --git a/sys-devel/gdb/files/gdb-8.2-tinfow.patch b/sys-devel/gdb/files/gdb-8.2-tinfow.patch
new file mode 100644
index 000000000000..48f6109664a2
--- /dev/null
+++ b/sys-devel/gdb/files/gdb-8.2-tinfow.patch
@@ -0,0 +1,44 @@
+Try to link gdb against tinfow first, then tinfo.
+
+In bug #669096 gdb was directly linked both
+to libtinfo.so.6 and libncursesw.so.6:
+    $ lddtree /usr/bin/gdb
+    /usr/bin/gdb (interpreter => /lib64/ld-linux-x86-64.so.2)
+    libtinfo.so.6 => /lib64/libtinfo.so.6
+    libncursesw.so.6 => /lib64/libncursesw.so.6
+        libtinfow.so.6 => /lib64/libtinfow.so.6
+    ...
+and caused gdb to SIGSEGV at start.
+
+Let's consistently link against *w libraries.
+
+Note: the fix on it's own is not enough:
+- we don't pass include paths to ncursesw libraries
+- libreadline.so.7 is still linked against libtinfo.so.6 in Gentoo
+  and needs a separate fix.
+
+But it's enough to make immediate SIGSEGV to go away.
+
+Reported-by: Michał Górny
+Bug: https://bugs.gentoo.org/669096
+--- a/gdb/configure.ac
++++ b/gdb/configure.ac
+@@ -616,4 +616,4 @@ esac
+ 
+-# These are the libraries checked by Readline.
+-AC_SEARCH_LIBS(tgetent, [termcap tinfo curses ncursesw ncurses])
++# These are the libraries checked by Readline. Not really: readline does not know about *w libs.
++AC_SEARCH_LIBS(tgetent, [termcap tinfow tinfo curses ncursesw ncurses])
+ 
+--- a/gdb/configure
++++ b/gdb/configure
+@@ -8984,3 +8984,3 @@ esac
+ 
+-# These are the libraries checked by Readline.
++# These are the libraries checked by Readline. Not really: readline does not know about *w libs.
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing tgetent" >&5
+@@ -9009,3 +9009,3 @@ return tgetent ();
+ _ACEOF
+-for ac_lib in '' termcap tinfo curses ncursesw ncurses; do
++for ac_lib in '' termcap tinfow tinfo curses ncursesw ncurses; do
+   if test -z "$ac_lib"; then