1 # ld-version-script.m4 serial 4 2 dnl Copyright (C) 2008-2015 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=$enableval], 24 [AC_CACHE_CHECK([if LD -Wl,--version-script works], 25 [gl_cv_sys_ld_version_script], 26 [gl_cv_sys_ld_version_script=no 27 save_LDFLAGS=$LDFLAGS 28 LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map" 29 echo foo >conftest.map 30 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], 31 [], 32 [cat > conftest.map <<EOF 33 VERS_1 { 34 global: sym; 35 }; 36 37 VERS_2 { 38 global: sym; 39 } VERS_1; 40 EOF 41 AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])], 42 [gl_cv_sys_ld_version_script=yes])]) 43 rm -f conftest.map 44 LDFLAGS=$save_LDFLAGS]) 45 have_ld_version_script=$gl_cv_sys_ld_version_script]) 46 AM_CONDITIONAL([HAVE_LD_VERSION_SCRIPT], 47 [test "$have_ld_version_script" = yes]) 48 ]) 49
