I was able to cross-compile a "hello world" program. First, I created the following symlinks:
# ln -s
/nix/store/mifp2p1zjlvb4ndslw1r8grkpglybqjf-glibc-cross-mips64el-linux-gnu-2.17/lib/crti.o
/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/crti.o
# ln -s
/nix/store/mifp2p1zjlvb4ndslw1r8grkpglybqjf-glibc-cross-mips64el-linux-gnu-2.17/lib/crt1.o
/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/crt1.o
# ln -s
/nix/store/mifp2p1zjlvb4ndslw1r8grkpglybqjf-glibc-cross-mips64el-linux-gnu-2.17/lib/crtn.o
/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/crtn.o
These are needed because I haven't found a way to set the
CROSS_LIBRARY_PATH variable. (I'll show an example below.)
Then I set this variable:
# export
COMPILER_PATH=/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/libexec/gcc/mips64el-linux-gnu:/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/libexec/gcc/mips64el-linux-gnu/4.7.2
which is used to locate subprograms [1].
After that I specified this one:
# export
C_INCLUDE_PATH=/nix/store/mifp2p1zjlvb4ndslw1r8grkpglybqjf-glibc-cross-mips64el-linux-gnu-2.17/include
And compiled the following program:
#include <stdio.h>
int main ()
{
printf ("Hello World!\n");
}
#
/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/bin/mips64el-linux-gnu-gcc
-static -o hello hello.c
Then I ran 'hello' on mips64el and it worked. Is it enough to be sure
that cross-compiler will also work for non-trivial programs?
Here is the example I mentioned:
# export CROSS_LIBRARY_PATH=foo
#
/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/bin/mips64el-linux-gnu-gcc
-static -o hello -v hello.c |& grep CROSS_LIBRARY_PATH
CROSS_LIBRARY_PATH=/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/:/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/../../../../mips64el-linux-gnu/lib
Note that CROSS_LIBRARY_PATH is not set to 'foo'. Could you explain
why? Is it determined automatically (e.g., based on the location of
GCC)?
# ltrace
/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/bin/mips64el-linux-gnu-gcc
-static -o hello -v hello.c |& grep CROSS_LIBRARY_PATH
getenv("CROSS_LIBRARY_PATH") = "foo"
strlen("CROSS_LIBRARY_PATH") = 18
memcpy(0x0867b044, "CROSS_LIBRARY_PATH", 18) = 0x0867b044
vfprintf(0xb77b3980, "%s\n",
0xbf9b3d88CROSS_LIBRARY_PATH=/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/:/nix/store/khdyz3i5aih56lxfk6hjvp3884apm7qb-gcc-cross-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/../../../../mips64el-linux-gnu/lib/
putenv("CROSS_LIBRARY_PATH=/nix/store/kh"...) = 0
How did 'vfprintf' get its third argument?
Comments? Do you know how to do it without the symlinks?
[1] http://gcc.gnu.org/onlinedocs/gcc/Environment-Variables.html
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