projects / people / ms / libloc.git / blame
| Commit | Line | Data |
|---|---|---|
| a76b0b96 MT |
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 | ]) |