forked from enlightenment/efl
62 lines
1.8 KiB
Plaintext
62 lines
1.8 KiB
Plaintext
dnl This code is public domain and can be freely used or copied.
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dnl File to auto-detect libunwind
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dnl Macro that checks for libunwind, first by using
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dnl pkg-config, then by trying to compile and link a simple
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dnl program, to see if libunwind is distributed on the system
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dnl but has no pkg-config support
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dnl
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dnl The biggest usecase is on Mac OS X, where there are no
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dnl pkg-config files, and the libunwind headers are lost
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dnl in an obscure place on the system (but whom the compilers
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dnl distributed by Apple are aware of).
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dnl
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dnl Usage: EFL_CHECK_LIBUNWIND
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dnl will inconditionaly set UNWIND_CFLAGS and UNWIND_LIBS
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dnl to follow pkg-config fashion.
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dnl
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AC_DEFUN([EFL_CHECK_LIBUNWIND],
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[dnl
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dnl First, check with pkg-config
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PKG_CHECK_MODULES([UNWIND], [libunwind libunwind-generic],
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[have_unwind=yes], [have_unwind=no])
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dnl No pkg-config file... maybe system built-in?
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if test "x${have_unwind}" = "xno"; then
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AC_LANG_PUSH([C])
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[[
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#include <libunwind.h>
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]],
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[[
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unw_context_t ctx;
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unw_getcontext(&ctx);
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]]
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)],
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[
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have_unwind="yes"
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],
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[
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have_unwind="no"
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]
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)
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AC_MSG_CHECKING([for native libunwind])
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AC_MSG_RESULT([${have_unwind}])
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AC_LANG_POP([C])
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dnl Provide dummy variables to automake.
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dnl In case pkg-config succeeded, these will be set and
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dnl used in other automake files. To avoid, problems,
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dnl we define empty variables.
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UNWIND_CFLAGS=""
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UNWIND_LIBS=""
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AC_SUBST([UNWIND_CFLAGS])
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AC_SUBST([UNWIND_LIBS])
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fi
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AS_IF([test "x$have_unwind" = "xyes"],
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[AC_DEFINE([HAVE_UNWIND], [1], [Have libunwind])])
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AM_CONDITIONAL(HAVE_UNWIND, test "x$have_unwind" = "xyes")
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])
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