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520a02b6fa
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
22 lines
640 B
Plaintext
22 lines
640 B
Plaintext
AC_DEFUN([AC_PLUGINS],
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[
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maybe_plugins=no
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AC_CHECK_HEADERS([dlfcn.h], [maybe_plugins=yes], [], [AC_INCLUDES_DEFAULT])
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AC_CHECK_HEADERS([windows.h], [maybe_plugins=yes], [], [AC_INCLUDES_DEFAULT])
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AC_ARG_ENABLE([plugins],
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AS_HELP_STRING([--enable-plugins], [Enable support for plugins]),
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[case "${enableval}" in
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no) plugins=no ;;
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*) plugins=yes
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if test "$maybe_plugins" != "yes" ; then
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AC_MSG_ERROR([Building with plugin support requires a host that supports dlopen.])
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fi ;;
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esac],
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[plugins=$maybe_plugins]
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)
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if test "$plugins" = "yes"; then
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AC_SEARCH_LIBS([dlsym], [dl])
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fi
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])
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