On 02/02/2015 10:46 PM, Peter Hutterer wrote:
the usual process is (used to be?):
SAVE_LIBS="$LIBS"
AC_SEARCH_LIBS(....)
EXPAT_LIBS="$LIBS"
LIBS="$SAVE_LIBS"
so you save the current state and restore it after it got mangled. we do
that for the rdp compositro CPPFLAGS already for example.
Okay I'll try that.
I would advice to use AM_SUBST_NOTMAKE(LIBS) and never rely on LIBS at
all. But that could be left to another patch I guess.
I think that would break everything because of the many uses of $(LIBS)
Do you rely on PKG_CHECK_MODULES to AC_SUBST?
I have no idea. I'm trying not to change the behavior when PKG_CHECK_MODULES
works, just to alter the behavior when it does not work.
PKG_CHECK_MODULES does this for you, it subst's the _LIBS and CFLAGS
variables from the first parameter, i.e. EXPAT_LIBS and EXPAT_CFLAGS in this
case. That's why you usually don't see the subst calls when pkgconfig is
used. Not sure it does it when it can't find the package though, so in this
case you'll have to call it manually to make sure it's invoked regardless of
PKG_CHECK_MODULES' success.
Got it, yes it looks like I am relying on that happening even if the
pkg-check fails. This actually makes sense since a failed package will
want to set those variables blank, not leave them with the label text.
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