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master
libmy/m4/ld-version-script.m4
53 строки
2 KB
Robert Edmonds
Merge branch 'master' of ../libmy
08 апр 2014, 00:25
08 апр 2014, 00:25
0dd090f
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# ld-version-script.m4 serial 3 dnl Copyright (C) 2008-2014 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. dnl From Simon Josefsson # FIXME: The test below returns a false positive for mingw # cross-compiles, 'local:' statements does not reduce number of # exported symbols in a DLL. Use --disable-ld-version-script to work # around the problem. # gl_LD_VERSION_SCRIPT # -------------------- # Check if LD supports linker scripts, and define automake conditional # HAVE_LD_VERSION_SCRIPT if so. AC_DEFUN([gl_LD_VERSION_SCRIPT], [ AC_ARG_ENABLE([ld-version-script], AS_HELP_STRING([--enable-ld-version-script], [enable linker version script (default is enabled when possible)]), [have_ld_version_script=$enableval], []) if test -z "$have_ld_version_script"; then AC_MSG_CHECKING([if LD -Wl,--version-script works]) save_LDFLAGS="$LDFLAGS" LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map" cat > conftest.map <<EOF foo EOF AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [accepts_syntax_errors=yes], [accepts_syntax_errors=no]) if test "$accepts_syntax_errors" = no; then cat > conftest.map <<EOF VERS_1 { global: sym; }; VERS_2 { global: sym; } VERS_1; EOF AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], [have_ld_version_script=yes], [have_ld_version_script=no]) else have_ld_version_script=no fi rm -f conftest.map LDFLAGS="$save_LDFLAGS" AC_MSG_RESULT($have_ld_version_script) fi AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes") ])