From 9834ab89cc80136e2e9f955ccd7037422dc2544a Mon Sep 17 00:00:00 2001 From: Christian Babeux Date: Thu, 2 Aug 2012 18:55:11 -0400 Subject: [PATCH] Fix: Libtool fails to find dependent libraries when cross-compiling lttng-ust This problem arise when cross compiling and linking libraries with indirect libraries dependencies (such as liblttng-ust). This "bug" is caused by an upstream modification in the libtool package on Debian system. The libtool "link_all_deplibs" flag is set to "no" by default on linux targets (AFAIK, other distros set it to "unknown"). The chosen solution is to detect such cases via the configure script and automagically patch the libtool.m4 by forcing the "link_all_deplibs" to "unknown". This fixup can be disabled with the appropriate configure flag: ./configure --disable-libtool-linkdep-fixup Sample configure output on affected systems: checking for occurence(s) of link_all_deplibs = no in ./config/libtool.m4... 3 configure: WARNING: the detected libtool will not link all dependencies, forcing link_all_deplibs = unknown Fixes: #321 Signed-off-by: Christian Babeux Signed-off-by: Mathieu Desnoyers --- configure.ac | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/configure.ac b/configure.ac index 5f4780cd..9d51e2e2 100644 --- a/configure.ac +++ b/configure.ac @@ -39,6 +39,31 @@ version_description="New type of beer, 100% from Quebec, flavored with sapin bea AC_DEFINE_UNQUOTED([VERSION_NAME], [$version_name], [UST version name]) AC_DEFINE_UNQUOTED([VERSION_DESCRIPTION], [$version_description], [UST version description]) +AC_PROG_GREP +# libtool link_all_deplibs fixup. See http://bugs.lttng.org/issues/321. +AC_ARG_ENABLE(libtool-linkdep-fixup, + AS_HELP_STRING([--disable-libtool-linkdep-fixup], + [disable the libtool fixup for linking all dependent libraries (link_all_deplibs)]), + libtool_fixup=$enableval, + libtool_fixup=yes) + +AS_IF([test "x$libtool_fixup" = "xyes"], + [ + libtool_m4="$srcdir/config/libtool.m4" + libtool_flag_pattern=".*link_all_deplibs\s*,\s*\$1\s*)" + AC_MSG_CHECKING([for occurence(s) of link_all_deplibs = no in $libtool_m4]) + libtool_flag_pattern_count=$(grep -c "$libtool_flag_pattern\s*=\s*no" $libtool_m4) + AS_IF([test $libtool_flag_pattern_count -ne 0], + [ + AC_MSG_RESULT([$libtool_flag_pattern_count]) + AC_MSG_WARN([the detected libtool will not link all dependencies, forcing link_all_deplibs = unknown]) + sed -i "s/\($libtool_flag_pattern\)\s*=\s*no/\1=unknown/g" $libtool_m4 + ], + [ + AC_MSG_RESULT([none]) + ]) + ]) + # Checks for programs. AC_PROG_CC AC_PROG_CXX -- 2.34.1