Package: toolchain-source
Version: 3.4-5
Severity: normal
Hello,
There is a problem with the way in which tpkg-make generates cross
compilers. The source of the problem stems from the fact that there
is no /usr/$(TARGET)/sys-include in a tpkg generated compiler. It is
easily shown by comparing a normal compiler limits.h to a cross
compiler's limits.h:
A normal compiler chains to the system's limits.h in the general case
via a #include_next <limits.h> at the bottom of the file:
>From /usr/lib/gcc/i486-linux/3.4.4/include/limits.h:
#ifdef _GCC_NEXT_LIMITS_H
#include_next <limits.h> /* recurse down to the real one */
#endif
A tpkg compiler's limits.h has no such chain-through. Digging through
the GCC sources shows that, ultimately, the chain will not be put in
the compiler's limits.h because /usr/$(TARGET)/sys-include/limits.h
isn't found. The simplistic fix is to make GCC look for
/usr/$(TARGET)/include/limits.h, such as with the following patch to
configure.ac in the src/gcc directory:
--- src/gcc/configure.ac.orig 2005-04-07 16:27:06.000000000 -0600
+++ src/gcc/configure.ac 2005-04-07 16:27:35.000000000 -0600
@@ -597,7 +597,7 @@
], [
TARGET_SYSTEM_ROOT=
TARGET_SYSTEM_ROOT_DEFINE=
- CROSS_SYSTEM_HEADER_DIR='$(gcc_tooldir)/sys-include'
+ CROSS_SYSTEM_HEADER_DIR='$(gcc_tooldir)/include'
])
AC_SUBST(TARGET_SYSTEM_ROOT)
AC_SUBST(TARGET_SYSTEM_ROOT_DEFINE)
After this patch is applied, autoconf need be run in the src/gcc directory.
A test case which clearly illustrates the problem is:
#include <stdio.h>
#include <limits.h>
int main(int argc, char *argv)
{
printf("PATH_MAX is %d\n", PATH_MAX);
return 0;
}
Using a normal compiler, the above code compiles properly. When using
an unpatched tpkg compiler, it fails with 'PATH_MAX undeclared':
error: `PATH_MAX' undeclared (first use in this function)
error: (Each undeclared identifier is reported only once
error: for each function it appears in.)
With the above patch, the tpkg compiler successfully compiles the code
and has the proper chain in it's limits.h.
Best regards,
Matt
-- System Information:
Debian Release: 3.1
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (101, 'experimental')
Architecture: i386 (i686)
Kernel: Linux 2.6.11.6.msw2
Locale: LANG=en_US, LC_CTYPE=en_US (charmap=ISO-8859-1)
Versions of packages toolchain-source depends on:
ii devscripts 2.8.14 Scripts to make the life of a Debi
ii dpkg-awk 1.0.1 Gawk script to parse /var/lib/dpkg
ii dpkg-cross 1.24 tools for cross compiling Debian p
ii m4 1.4.2-1 a macro processing language
ii wget 1.9.1-8 retrieves files from the web
-- no debconf information
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