Re: Initial cross-compilation support

[Nikita Karetnikov <nikita@karetnikov.org>]

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> The absolute file name appeared in your previous message:

>   /nix/store/g9js73bwv1fl92h1nnf50vf1619irnxf-gcc-cross-sans-libc-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/libgcc.a

# objdump -a /nix/store/g9js73bwv1fl92h1nnf50vf1619irnxf-gcc-cross-sans-libc-mips64el-linux-gnu-4.7.2/lib/gcc/mips64el-linux-gnu/4.7.2/libgcc.a | grep 'file format' | head
_m16addsf3.o:     file format elf64-little
_m16subsf3.o:     file format elf64-little
_m16mulsf3.o:     file format elf64-little
_m16divsf3.o:     file format elf64-little
_m16eqsf2.o:     file format elf64-little
_m16nesf2.o:     file format elf64-little
_m16gtsf2.o:     file format elf64-little
_m16gesf2.o:     file format elf64-little
_m16lesf2.o:     file format elf64-little
_m16ltsf2.o:     file format elf64-little

> After a bit of research, I found ports/sysdeps/mips/preconfigure (in
> libc).  Apparently, it interprets the OS part of the target triplet to
> determine the ABI.  So, if you specify --target=mips64el-linux-gnuabi64,
> it should automatically build glibc for n64.

I changed it like this:

diff --git a/gnu/packages/cross-base.scm b/gnu/packages/cross-base.scm
index 69dc9f5..8cd93e9 100644
--- a/gnu/packages/cross-base.scm
+++ b/gnu/packages/cross-base.scm
@@ -87,6 +87,10 @@ GCC that does not target a libc; otherwise, target that libc."
                                    "--disable-libssp"
                                    "--disable-libquadmath"
                                    "--disable-decimal-float" ; would need libc
+
+                                   ;; MIPS64
+                                   "--with-arch=mips64"
+                                   "--with-abi=64"
                                    )))
 
                      ,(if libc
@@ -231,7 +235,8 @@ XBINUTILS and the cross tool chain."
 ;;;
 
 (define-public xgcc-mips64el
-  (let ((triplet "mips64el-linux-gnu"))
+  ;; (let ((triplet "mips64el-linux-gnu"))
+  (let ((triplet "mips64el-linux-gnuabi64"))
     (cross-gcc triplet
                (cross-binutils triplet)
                (cross-libc triplet))))

> So, if you specify --target=mips64el-linux-gnuabi64,
> it should automatically build glibc for n64.

But 'guix build' doesn't have '--target'.  How can I specify it?

So I used the following command:

# ./pre-inst-env guix build -K gcc-cross-mips64el-linux-gnuabi64

[...]

mips64el-linux-gnuabi64-gcc -mabi=64   -nostdlib -nostartfiles -r -o /tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/libc_pic.os \
 -Wl,-d -Wl,--whole-archive /tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/libc_pic.a -o /tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/libc_pic.os
mips64el-linux-gnuabi64-gcc -mabi=64   -nostdlib -nostartfiles -r -o /tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/elf/librtld.map.o '-Wl,-(' /tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/elf/dl-allobjs.os /tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/libc_pic.a -lgcc '-Wl,-)' -Wl,-Map,/tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/elf/librtld.mapT
/tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/libc_pic.a: could not read symbols: Archive has no index; run ranlib to add one
collect2: error: ld returned 1 exit status
make[2]: *** [/tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/build/elf/librtld.map] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/glibc-2.17/elf'
make[1]: *** [elf/subdir_lib] Error 2
make[1]: Leaving directory `/tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1/glibc-2.17'
make: *** [all] Error 2
phase `build' failed after 258 seconds
note: keeping build directory `/tmp/nix-build-glibc-cross-mips64el-linux-gnuabi64-2.17.drv-1'
builder for `/nix/store/hdga358q2fcdcwlzy9g72cc6xaf2wvza-glibc-cross-mips64el-linux-gnuabi64-2.17.drv' failed with exit code 1
@ build-failed /nix/store/hdga358q2fcdcwlzy9g72cc6xaf2wvza-glibc-cross-mips64el-linux-gnuabi64-2.17.drv /nix/store/ca0s9nrmmfy654fjyg0rm73n3pnc677n-glibc-cross-mips64el-linux-gnuabi64-2.17 1 builder for `/nix/store/hdga358q2fcdcwlzy9g72cc6xaf2wvza-glibc-cross-mips64el-linux-gnuabi64-2.17.drv' failed with exit code 1
cannot build derivation `/nix/store/c4avrlc8bg33jsmwq9rgj8z8vyc69sdy-gcc-cross-mips64el-linux-gnuabi64-4.7.2.drv': 1 dependencies couldn't be built
error: build failed: build of `/nix/store/c4avrlc8bg33jsmwq9rgj8z8vyc69sdy-gcc-cross-mips64el-linux-gnuabi64-4.7.2.drv' failed

config.log:

[...]

configure:7187: mips64el-linux-gnuabi64-gcc -o conftest -g -O2   -mabi=64   conftest.c  -lgd -lpng -lz -lm >&5
conftest.c:19:16: fatal error: gd.h: No such file or directory

[...]

configure:7209: checking for is_selinux_enabled in -lselinux
configure:7234: mips64el-linux-gnuabi64-gcc -o conftest -g -O2  -mabi=64  conftest.c -lselinux   >&5
/nix/store/19rp26b4hzpdxnday60fxv7ygr5445aj-gcc-cross-sans-libc-mips64el-linux-gnuabi64-4.7.2/libexec/gcc/mips64el-linux-gnuabi64/ld: cannot find crt1.o: No such file or directory
/nix/store/19rp26b4hzpdxnday60fxv7ygr5445aj-gcc-cross-sans-libc-mips64el-linux-gnuabi64-4.7.2/libexec/gcc/mips64el-linux-gnuabi64/ld: cannot find crti.o: No such file or directory
/nix/store/19rp26b4hzpdxnday60fxv7ygr5445aj-gcc-cross-sans-libc-mips64el-linux-gnuabi64-4.7.2/libexec/gcc/mips64el-linux-gnuabi64/ld: cannot find -lselinux
/nix/store/19rp26b4hzpdxnday60fxv7ygr5445aj-gcc-cross-sans-libc-mips64el-linux-gnuabi64-4.7.2/libexec/gcc/mips64el-linux-gnuabi64/ld: cannot find -lc
/nix/store/19rp26b4hzpdxnday60fxv7ygr5445aj-gcc-cross-sans-libc-mips64el-linux-gnuabi64-4.7.2/libexec/gcc/mips64el-linux-gnuabi64/ld: cannot find crtn.o: No such file or directory
collect2: error: ld returned 1 exit status

[...]

configure:7404: mips64el-linux-gnuabi64-gcc -o conftest -g -O2  -mabi=64  conftest.c  >&5
conftest.c:22:19: fatal error: stdio.h: No such file or directory
compilation terminated.

There are other errors.  But I guess that they all have the same cause
(i.e., GCC can't find the needed files).  Is it correct?

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