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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 | ]) |