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configure: use the -Bsymbolic-functions linker flag if supported

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This feature turns intra library calls into direct function calls and thus makes
them a little faster. The downside is that this causes problems for e.g.
LD_PRELOAD based tools. Thus add a configure option to turn it off.
This commit is contained in:
Stefan Kost 2010-12-15 12:21:05 +02:00
parent 525776df79
commit 3457bc7149
1 changed files with 19 additions and 0 deletions
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19
configure.ac
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@ -337,6 +337,22 @@ AC_COMPILE_IFELSE(
]) ])
AM_CONDITIONAL(HAVE_LINUX_JOYSTICK_HEADERS, test "x$HAVE_LINUX_JOYSTICK_HEADERS" = "xyes") AM_CONDITIONAL(HAVE_LINUX_JOYSTICK_HEADERS, test "x$HAVE_LINUX_JOYSTICK_HEADERS" = "xyes")
dnl Check for -Bsymbolic-functions linker flag used to avoid
dnl intra-library PLT jumps, if available.
AC_ARG_ENABLE(Bsymbolic,
[AC_HELP_STRING([--disable-Bsymbolic],
[avoid linking with -Bsymbolic])],,
[SAVED_LDFLAGS="${LDFLAGS}"
AC_MSG_CHECKING([for -Bsymbolic-functions linker flag])
LDFLAGS=-Wl,-Bsymbolic-functions
AC_TRY_LINK([], [int main (void) { return 0; }],
AC_MSG_RESULT(yes)
enable_Bsymbolic=yes,
AC_MSG_RESULT(no)
enable_Bsymbolic=no)
LDFLAGS="${SAVED_LDFLAGS}"])
dnl *** set variables based on configure arguments *** dnl *** set variables based on configure arguments ***
dnl set license and copyright notice dnl set license and copyright notice
@ -870,6 +886,9 @@ AC_SUBST(GST_LIBS)
dnl LDFLAGS really should only contain flags, not libs - they get added before dnl LDFLAGS really should only contain flags, not libs - they get added before
dnl whatevertarget_LIBS and -L flags here affect the rest of the linking dnl whatevertarget_LIBS and -L flags here affect the rest of the linking
GST_ALL_LDFLAGS="-no-undefined" GST_ALL_LDFLAGS="-no-undefined"
if test "x${enable_Bsymbolic}" == "xyes"; then
GST_ALL_LDFLAGS="$GST_ALL_LDFLAGS -Wl,-Bsymbolic-functions"
fi
AC_SUBST(GST_ALL_LDFLAGS) AC_SUBST(GST_ALL_LDFLAGS)
dnl GST_LIB_LDFLAGS dnl GST_LIB_LDFLAGS