[CLN-list] configuration (and build) fails unless top_srcdir = top_builddir

[Alexei Sheplyakov]

Dear Richard,

On Sun, Apr 06, 2008 at 09:47:04PM +0200, Richard B. Kreckel wrote:
 
> Ooops. Can you, please, word a comment what this line does and why,
> and I'll happily apply it. I'm afraid someone will remove it again some day 
> because it looks sooo much like nonsense.

[PATCH] configure.ac: create subdirectory to hold auto-generated headers.

This is necessary for VPATH builds (i.e. when build directory is different
from the source one).

---
 configure.ac |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/configure.ac b/configure.ac
index d9c5d66..32325d9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -154,6 +154,13 @@ dnl           checks for compiler characteristics
 dnl
 AC_C_CHAR_UNSIGNED
                       dnl DEFS __CHAR_UNSIGNED__ if char is unsigned
+
+dnl Create a subdirectory in the ${top_builddir} to hold auto-generated
+dnl headers. This subdirectory does not exist when ${top_builddir} != ${top_srcdir}
+dnl (a.k.a. "VPATH build").
+if test ! -d include/cln; then
+	AS_MKDIR_P([include/cln])
+fi
 CL_MACHINE([integer types and behaviour],${srcdir}/autoconf/intparam.c,[CL_INTPARAM_CROSS],include/cln/intparam.h,cl_cv_file_intparam_h)
                       dnl builds include/cln/intparam.h
 CL_MACHINE([floating-point types and behaviour],${srcdir}/autoconf/floatparam.c,[CL_FLOATPARAM_CROSS],include/cln/floatparam.h,cl_cv_file_floatparam_h)
-- 
1.5.4.2


> That feature is useful for people like Paul Zimmermann, who have 
> fifty-some versions of libgmp sitting in /opt/.

I understand why such feature is useful. But it doesn't work properly.
That is, /usr/lib/libgmp.so.?  is used anyway, unless I manually set LDFLAGS,
i.e.

LDFLAGS="-Wl,--rpath=~/package/gmp/4.2.2/lib" ../configure --with-gmp=~/package/gmp/4.2.2 --disable-static

Best regards,
	Alexei

-- 
All science is either physics or stamp collecting.

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