Am 2015-06-09 14:21, schrieb m. allan noah:
We need more info here. Where do you see this expansion problem?
allan
The problem is that LIBDIR is passed as a define from the build system.
Then, STRINGIFY(LIBDIR) is used in backend/dll.c to get a string of the
search path for the backends.
This seems to be fine but it can become a problem since "linux" is
definded to "1" by default.
This causes an issue on e. g. Exherbo, my linux distribution. Exherbo
installs all packages to /usr/target-triplet/{bin,lib,include,...} so
that you can have packages for different architectures on the same root.
On my system, sane would be installed to /usr/x86_64-pc-linux-gnu/...,
so that LIBDIR would be defined to be /usr/x86_64-pc-linux-gnu/lib.
But now, STRINGIFY(LIBDIR) turns this into /usr/x86_64-pc-1-gnu/lib
(since it also expands linux) - and as a result, sane cannot find any
backends.
Ole
On Sun, Jun 7, 2015 at 4:14 PM, Niels Ole Salscheider
<niels_...@salscheider-online.de> wrote:
Otherwise, "linux" will be expanded to "1" when it is stringified.
This is a problem for e. g. LIBDIR, which might contain a target
triplet.
On my system, /usr/x86_64-pc-linux-gnu-gcc would expand to
x86_64-pc-1-gnu-gcc.
---
include/sane/sanei.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/sane/sanei.h b/include/sane/sanei.h
index ece1beb..90ec028 100644
--- a/include/sane/sanei.h
+++ b/include/sane/sanei.h
@@ -140,6 +140,9 @@
/** @hideinitializer */
#define NELEMS(a) ((int)(sizeof (a) / sizeof (a[0])))
+/* undef linux so that it can be stringified. It would expand to 1
otherwise. */
+#undef linux
+
/** @hideinitializer */
#define STRINGIFY1(x) #x
/** @hideinitializer */
--
2.4.2
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