gcc/config
H.J. Lu 520a02b6fa Use dlsym to check if libdl is needed for plugin
config/plugins.m4 has

 if test "$plugins" = "yes"; then
    AC_SEARCH_LIBS([dlopen], [dl])
  fi

Plugin uses dlsym, but libasan.so only intercepts dlopen, not dlsym:

[hjl@gnu-tools-1 binutils-text]$ nm -D /lib64/libasan.so.4| grep " dl"
0000000000038580 W dlclose
                 U dl_iterate_phdr
000000000004dc50 W dlopen
                 U dlsym
                 U dlvsym
[hjl@gnu-tools-1 binutils-text]$

Testing dlopen for libdl leads to false negative when -fsanitize=address
is used.  It results in link failure:

../bfd/.libs/libbfd.a(plugin.o): undefined reference to symbol 'dlsym@@GLIBC_2.16'

dlsym should be used to check if libdl is needed for plugin.

	PR gas/22318
	* plugins.m4 (AC_PLUGINS): Use dlsym to check if libdl is needed.

From-SVN: r259140
2018-04-05 10:49:39 -07:00
..
2008-07-30 14:57:07 +00:00
2015-05-05 03:41:53 +00:00
2015-04-14 08:04:45 -07:00
2016-12-08 09:46:03 +10:30
2010-07-02 10:26:12 +00:00
2012-10-15 13:10:30 +00:00
2017-02-13 08:54:02 +00:00
2012-05-03 15:39:07 +00:00
2012-04-03 12:07:28 +00:00
2016-12-08 09:46:03 +10:30
2015-05-13 21:15:31 +00:00
2008-12-21 14:27:18 -08:00
2015-05-27 16:40:38 -04:00