mirror of
https://github.com/zeromq/libzmq.git
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143 lines
4.6 KiB
Plaintext
143 lines
4.6 KiB
Plaintext
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# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_check_vscript.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_CHECK_VSCRIPT
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#
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# DESCRIPTION
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#
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# Check whether the linker supports version scripts. Version scripts are
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# used when building shared libraries to bind symbols to version nodes
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# (helping to detect incompatibilities) or to limit the visibility of
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# non-public symbols.
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#
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# Output:
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#
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# If version scripts are supported, VSCRIPT_LDFLAGS will contain the
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# appropriate flag to pass to the linker. On GNU systems this would
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# typically be "-Wl,--version-script", and on Solaris it would typically
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# be "-Wl,-M".
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#
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# Two Automake conditionals are also set:
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#
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# HAVE_VSCRIPT is true if the linker supports version scripts with
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# entries that use simple wildcards, like "local: *".
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#
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# HAVE_VSCRIPT_COMPLEX is true if the linker supports version scripts with
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# pattern matching wildcards, like "global: Java_*".
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#
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# On systems that do not support symbol versioning, such as Mac OS X, both
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# conditionals will be false. They will also be false if the user passes
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# "--disable-symvers" on the configure command line.
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#
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# Example:
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#
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# configure.ac:
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#
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# AX_CHECK_VSCRIPT
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#
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# Makefile.am:
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#
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# if HAVE_VSCRIPT
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# libfoo_la_LDFLAGS += $(VSCRIPT_LDFLAGS),@srcdir@/libfoo.map
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# endif
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#
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# if HAVE_VSCRIPT_COMPLEX
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# libbar_la_LDFLAGS += $(VSCRIPT_LDFLAGS),@srcdir@/libbar.map
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# endif
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#
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# LICENSE
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#
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# Copyright (c) 2014 Kevin Cernekee <cernekee@gmail.com>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 2
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# _AX_CHECK_VSCRIPT(flag, global-sym, action-if-link-succeeds, [junk-file=no])
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AC_DEFUN([_AX_CHECK_VSCRIPT], [
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AC_LANG_PUSH([C])
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ax_check_vscript_save_flags="$LDFLAGS"
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echo "V1 { global: $2; local: *; };" > conftest.map
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AS_IF([test x$4 = xyes], [
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echo "{" >> conftest.map
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])
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LDFLAGS="$LDFLAGS -Wl,$1,conftest.map"
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[int show, hide;]], [])], [$3])
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LDFLAGS="$ax_check_vscript_save_flags"
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rm -f conftest.map
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AC_LANG_POP([C])
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]) dnl _AX_CHECK_VSCRIPT
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AC_DEFUN([AX_CHECK_VSCRIPT], [
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AC_ARG_ENABLE([symvers],
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AS_HELP_STRING([--disable-symvers],
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[disable library symbol versioning [default=auto]]),
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[want_symvers=$enableval],
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[want_symvers=yes]
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)
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AS_IF([test x$want_symvers = xyes], [
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dnl First test --version-script and -M with a simple wildcard.
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AC_CACHE_CHECK([linker version script flag], ax_cv_check_vscript_flag, [
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ax_cv_check_vscript_flag=unsupported
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_AX_CHECK_VSCRIPT([--version-script], [show], [
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ax_cv_check_vscript_flag=--version-script
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])
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AS_IF([test x$ax_cv_check_vscript_flag = xunsupported], [
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_AX_CHECK_VSCRIPT([-M], [show], [ax_cv_check_vscript_flag=-M])
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])
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dnl The linker may interpret -M (no argument) as "produce a load map."
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dnl If "-M conftest.map" doesn't fail when conftest.map contains
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dnl obvious syntax errors, assume this is the case.
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AS_IF([test x$ax_cv_check_vscript_flag != xunsupported], [
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_AX_CHECK_VSCRIPT([$ax_cv_check_vscript_flag], [show],
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[ax_cv_check_vscript_flag=unsupported], [yes])
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])
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])
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dnl If the simple wildcard worked, retest with a complex wildcard.
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AS_IF([test x$ax_cv_check_vscript_flag != xunsupported], [
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ax_check_vscript_flag=$ax_cv_check_vscript_flag
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AC_CACHE_CHECK([if version scripts can use complex wildcards],
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ax_cv_check_vscript_complex_wildcards, [
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ax_cv_check_vscript_complex_wildcards=no
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_AX_CHECK_VSCRIPT([$ax_cv_check_vscript_flag], [sh*], [
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ax_cv_check_vscript_complex_wildcards=yes])
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])
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ax_check_vscript_complex_wildcards="$ax_cv_check_vscript_complex_wildcards"
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], [
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ax_check_vscript_flag=
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ax_check_vscript_complex_wildcards=no
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])
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], [
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AC_MSG_CHECKING([linker version script flag])
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AC_MSG_RESULT([disabled])
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ax_check_vscript_flag=
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ax_check_vscript_complex_wildcards=no
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])
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AS_IF([test x$ax_check_vscript_flag != x], [
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VSCRIPT_LDFLAGS="-Wl,$ax_check_vscript_flag"
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AC_SUBST([VSCRIPT_LDFLAGS])
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])
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AM_CONDITIONAL([HAVE_VSCRIPT],
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[test x$ax_check_vscript_flag != x])
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AM_CONDITIONAL([HAVE_VSCRIPT_COMPLEX],
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[test x$ax_check_vscript_complex_wildcards = xyes])
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]) dnl AX_CHECK_VSCRIPT
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