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1 | # ld-version-script.m4 serial 1 |
2 | dnl Copyright (C) 2008, 2009 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 | VERS_1 { | |
1cd4fffc | 30 | global: sym; |
25361e4b LC |
31 | }; |
32 | ||
33 | VERS_2 { | |
34 | global: sym; | |
35 | } VERS_1; | |
36 | EOF | |
37 | AC_LINK_IFELSE(AC_LANG_PROGRAM([], []), | |
38 | [have_ld_version_script=yes], [have_ld_version_script=no]) | |
39 | rm -f conftest.map | |
40 | LDFLAGS="$save_LDFLAGS" | |
41 | AC_MSG_RESULT($have_ld_version_script) | |
42 | fi | |
43 | AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes") | |
44 | ]) |