| # ld-version-script.m4 serial 1 |
| dnl Copyright (C) 2008, 2009 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 |
| 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]) |
| rm -f conftest.map |
| LDFLAGS="$save_LDFLAGS" |
| AC_MSG_RESULT($have_ld_version_script) |
| fi |
| ]) |
