Bug#872891: gcc-multilib conflicts with GCC cross toolchains
Hi,
in 2017, Matthias Klose marked this bug as wontfix, and explained the
problem like this:
> because the cross toolchain has /usr/include on it's include path,
> which has incompatible header files: /usr/include/asm.
Is that still the case, a few years later? I have an x86_64 machine with
debian buster + gcc-10 and cross compilers from "bullseye" (testing),
and no /usr/include/asm at all. I have the following gcc packages
installed:
ii gcc 4:10.1.0-1 amd64 GNU C compiler
ii gcc-10 10.2.0-7 amd64 GNU C compiler
ii gcc-10-arm-linux-gnueabihf 10.2.0-3cross2 amd64 GNU C compiler (cross compiler for armhf architecture)
ii gcc-10-arm-linux-gnueabihf-base:amd64 10.2.0-3cross2 amd64 GCC, the GNU Compiler Collection (base package)
ii gcc-10-base:amd64 10.2.0-7 amd64 GCC, the GNU Compiler Collection (base package)
ii gcc-10-base:armhf 10.2.0-7 armhf GCC, the GNU Compiler Collection (base package)
ii gcc-10-cross-base 10.2.0-3cross2 all GCC, the GNU Compiler Collection (library base package)
ii gcc-10-i686-linux-gnu 10.2.0-3cross2 amd64 GNU C compiler (cross compiler for i386 architecture)
ii gcc-10-i686-linux-gnu-base:amd64 10.2.0-3cross2 amd64 GCC, the GNU Compiler Collection (base package)
ii gcc-10-multilib 10.2.0-7 amd64 GNU C compiler (multilib support)
ii gcc-10-multilib-i686-linux-gnu 10.2.0-3cross2 amd64 GNU C compiler (multilib support) (cross compiler for i386 architecture)
ii gcc-8 8.4.0-4 amd64 GNU C compiler
ii gcc-8-base:amd64 8.4.0-4 amd64 GCC, the GNU Compiler Collection (base package)
ii gcc-9-base:amd64 9.3.0-18 amd64 GCC, the GNU Compiler Collection (base package)
ii gcc-arm-linux-gnueabihf 4:10.1.0-1 amd64 GNU C compiler for the armhf architecture
ii gcc-i686-linux-gnu 4:10.1.0-1 amd64 GNU C compiler for the i386 architecture
ii gcc-mingw-w64 10.1.0-3+23 all GNU C compiler for MinGW-w64
ii gcc-mingw-w64-base 10.1.0-3+23 amd64 GNU Compiler Collection for MinGW-w64 (base package)
ii gcc-mingw-w64-i686 10.1.0-3+23 all GNU C compiler for MinGW-w64 targeting Win32
ii gcc-mingw-w64-i686-posix 10.1.0-3+23 amd64 GNU C compiler for MinGW-w64, Win32/POSIX
ii gcc-mingw-w64-i686-posix-runtime 10.1.0-3+23 amd64 GNU Compiler Collection for MinGW-w64, i686/posix
ii gcc-mingw-w64-i686-win32 10.1.0-3+23 amd64 GNU C compiler for MinGW-w64, Win32/Win32
ii gcc-mingw-w64-i686-win32-runtime 10.1.0-3+23 amd64 GNU Compiler Collection for MinGW-w64, i686/win32
ii gcc-mingw-w64-x86-64 10.1.0-3+23 all GNU C compiler for MinGW-w64 targeting Win64
ii gcc-mingw-w64-x86-64-posix 10.1.0-3+23 amd64 GNU C compiler for MinGW-w64, Win64/POSIX
ii gcc-mingw-w64-x86-64-posix-runtime 10.1.0-3+23 amd64 GNU Compiler Collection for MinGW-w64, x86-64/posix
ii gcc-mingw-w64-x86-64-win32 10.1.0-3+23 amd64 GNU C compiler for MinGW-w64, Win64/Win32
ii gcc-mingw-w64-x86-64-win32-runtime 10.1.0-3+23 amd64 GNU Compiler Collection for MinGW-w64, x86-64/win32
ii gcc-multilib-i686-linux-gnu 4:10.1.0-1 amd64 GNU C compiler for the i386 architecture
ii lib32gcc-10-dev 10.2.0-7 amd64 GCC support library (32 bit development files)
ii lib32gcc-s1 10.2.0-7 amd64 GCC support library (32 bit Version)
ii lib64gcc-10-dev-i386-cross 10.2.0-3cross2 all GCC support library (64bit development files)
ii lib64gcc-s1-i386-cross 10.2.0-3cross2 all GCC support library (i386) (64bit)
ii libgcc-10-dev:amd64 10.2.0-7 amd64 GCC support library (development files)
ii libgcc-10-dev-armhf-cross 10.2.0-3cross2 all GCC support library (development files)
ii libgcc-10-dev-i386-cross 10.2.0-3cross2 all GCC support library (development files)
ii libgcc-8-dev:amd64 8.4.0-4 amd64 GCC support library (development files)
ii libgcc-s1:amd64 10.2.0-7 amd64 GCC support library
ii libgcc-s1:armhf 10.2.0-7 armhf GCC support library
ii libgcc-s1-armhf-cross 10.2.0-3cross2 all GCC support library (armhf)
ii libgcc-s1-i386-cross 10.2.0-3cross2 all GCC support library (i386)
ii libx32gcc-10-dev 10.2.0-7 amd64 GCC support library (x32 development files)
ii libx32gcc-10-dev-i386-cross 10.2.0-3cross2 all GCC support library (x32 development files)
ii libx32gcc-s1 10.2.0-7 amd64 GCC support library (x32)
ii libx32gcc-s1-i386-cross 10.2.0-3cross2 all GCC support library (i386) (x32)
I'm trying to compile the following hello.c program:
#include <stdio.h>
#include <errno.h>
int main(int argc, char **argv) { printf("foo\n"); return 0; }
It works fine to compile it using
$ i686-linux-gnu-gcc hello.c
and that produces a 32-bit executable. However, with gcc -m32 I get
$ gcc -m32 hello.c
In file included from /usr/include/bits/errno.h:26,
from /usr/include/errno.h:28,
from hello.c:2:
/usr/include/linux/errno.h:1:10: fatal error: asm/errno.h: No such file
or directory
1 | #include <asm/errno.h>
| ^~~~~~~~~~~~~
compilation terminated.
(If I delete the errno.h include, it works, so it seems to only be a
problem with certain system header files missing). If I attempt to
solve the problem by installing gcc-multilib using
# apt-get install -t testing gcc-multilib
it wants to remove the arm and i686 cross compilers (but not the mingw
cross compilers),
The following packages will be REMOVED:
gcc-10-arm-linux-gnueabihf gcc-10-i686-linux-gnu gcc-10-multilib-i686-linux-gnu
gcc-arm-linux-gnueabihf gcc-i686-linux-gnu gcc-multilib-i686-linux-gnu
Regarding the mentioned conflict over /usr/include/asm, I don't have that
directory at all on this machine. Related existing directories are
/usr/include/asm-generic/ (package linux-libc-dev:amd64)
/usr/include/x86_64-linux-gnu/asm (also package linux-libc-dev:amd64)
/usr/i686-linux-gnu/include/asm/ (linux-libc-dev-i386-cross)
/usr/arm-linux-gnueabihf/include/asm (linux-libc-dev-armhf-cross)
So the files belonging to the cross compiler packages shouldn't be in
the way, as far as I can tell. And I guess the proper location for the
missing asm/errno.h would be in /usr/include/i386-linux-gnu/asm/, but I
haven't been able to find what's the proper package to install to get
that directory (maybe linux-libc-dev:i386, but it's a bit unexpected to
have to add i386 as a foreign architecture just to get gcc -m32 to
work)?
Vagely related, I have duplicate, but not interfering, copies of some
foreign libc library files, e.g, I have both
/lib/arm-linux-gnueabihf/libc-2.31.so (package libc6:armhf)
/usr/arm-linux-gnueabihf/lib/libc-2.31.so (package libc6-armhf-cross)
I think the latter is needed by the cross compiler, and the former for
running arm binaries using qemu-arm. That's slightly annoying and a bit
wasted disk usage, but not causing any errors once I realized that both
packages are needed.
Regards,
/Niels
--
Niels Möller. PGP-encrypted email is preferred. Keyid 368C6677.
Internet email is subject to wholesale government surveillance.
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