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configure.ac: allow user to disable libunwind discovery via --disable-libunwind

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on ia64 architecture libunwind comes with gcc. Unfortunately
libunwind is not directly usable as-is and fails at link time:

```
    ia64-unknown-linux-gnu-g++ -o perf/.libs/local_lat perf/local_lat.o src/.libs/libzmq.so -lsodium -lrt -lpthread -ldl
    src/.libs/libzmq.so: undefined reference to `_ULia64_step'
```

The change adds --{enable,disable}-libunwind flag to control
automatic dependency. The default is unchanged: use if available.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
This commit is contained in:
Sergei Trofimovich 2017-07-14 21:44:30 +01:00
parent dfcf396ded
commit 88487e7da3
1 changed files with 22 additions and 10 deletions
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32
configure.ac
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@ -721,16 +721,28 @@ else
AC_SUBST(pkg_config_defines, "")
fi
PKG_CHECK_MODULES(LIBUNWIND, [libunwind],
[
AC_DEFINE(HAVE_LIBUNWIND, 1, [The libunwind library is to be used])
AC_SUBST([LIBUNWIND_CFLAGS])
AC_SUBST([LIBUNWIND_LIBS])
AC_CHECK_LIB([dl], [dladdr])
],
[
AC_MSG_WARN([Cannot find libunwind])
])
AC_ARG_ENABLE([libunwind],
[AS_HELP_STRING([--enable-libunwind],
[enable libunwind [default=auto]])],
[enable_libunwind=$enableval],
[enable_libunwind="auto"])
if test "x$enable_libunwind" != "xno"; then
PKG_CHECK_MODULES(LIBUNWIND, [libunwind],
[
AC_DEFINE(HAVE_LIBUNWIND, 1, [The libunwind library is to be used])
AC_SUBST([LIBUNWIND_CFLAGS])
AC_SUBST([LIBUNWIND_LIBS])
AC_CHECK_LIB([dl], [dladdr])
],
[
if test "x$enable_libunwind" = "xyes"; then
AC_MSG_ERROR([Cannot find libunwind])
else
AC_MSG_WARN([Cannot find libunwind])
fi
])
fi
# Subst LIBZMQ_EXTRA_CFLAGS & CXXFLAGS & LDFLAGS
AC_SUBST(LIBZMQ_EXTRA_CFLAGS)