1 # ld-version-script.m4 serial 3 2 dnl Copyright (C) 2008-2012 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 dnl From Simon Josefsson 8 9 # FIXME: The test below returns a false positive for mingw 10 # cross-compiles, 'local:' statements does not reduce number of 11 # exported symbols in a DLL. Use --disable-ld-version-script to work 12 # around the problem. 13 14 # gl_LD_VERSION_SCRIPT 15 # -------------------- 16 # Check if LD supports linker scripts, and define automake conditional 17 # HAVE_LD_VERSION_SCRIPT if so. 18 AC_DEFUN([gl_LD_VERSION_SCRIPT], 19 [ 20 AC_ARG_ENABLE([ld-version-script], 21 AS_HELP_STRING([--enable-ld-version-script], 22 [enable linker version script (default is enabled when possible)]), 23 [have_ld_version_script=$enableval], []) 24 if test -z "$have_ld_version_script"; then 25 AC_MSG_CHECKING([if LD -Wl,--version-script works]) 26 save_LDFLAGS="$LDFLAGS" 27 LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map" 28 cat > conftest.map <<EOF 29 foo 30 EOF 31 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], 32 [accepts_syntax_errors=yes], [accepts_syntax_errors=no]) 33 if test "$accepts_syntax_errors" = no; then 34 cat > conftest.map <<EOF 35 VERS_1 { 36 global: sym; 37 }; 38 39 VERS_2 { 40 global: sym; 41 } VERS_1; 42 EOF 43 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], 44 [have_ld_version_script=yes], [have_ld_version_script=no]) 45 else 46 have_ld_version_script=no 47 fi 48 rm -f conftest.map 49 LDFLAGS="$save_LDFLAGS" 50 AC_MSG_RESULT($have_ld_version_script) 51 fi 52 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes") 53 ]) 54
