GNU bug report logs - #78854
Cross-Compiling: ld.lld - "clang_rt.crtbegin.o is incompatible with elf32-littlearm"

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: NR <nroycea+gnu <at> gmail.com>
To: bug-libtool <at> gnu.org
Subject: Cross-Compiling: ld.lld - "clang_rt.crtbegin.o is incompatible with
 elf32-littlearm"
Date: Fri, 20 Jun 2025 18:27:53 -0500

```
       host-triplet:   armv6-pc-linux-gnu
       shell:          /bin/sh
       compiler:       /<pathTo>/toolchain/bin/clang
       compiler flags: -pipe --target=armv6-pc-linux-gnu
--sysroot=/<pathTo>/sysroot -mfloat-abi=soft
-Wno-unused-command-line-argument
       linker:         /<pathTo>/toolchain/bin/ld.lld (gnu? yes)
       version:        libtool (GNU libtool) 2.5.4.1-baa1-dirty
       automake:       automake (GNU automake) 1.17
       autoconf:       autoconf (GNU Autoconf) 2.72
```

For some reason, libtool isn't specifying the target for ld.lld:
ld.lld: error: /<pathTo>/toolchain/lib/clang/21/lib/x86_64-unknown-linux-gnu/clang_rt.crtbegin.o
is incompatible with elf32-littlearm

```
/bin/sh ./libtool  --tag=CC   --mode=link
/<pathTo>/toolchain/bin/clang -Wall -Wextra -Walloca
-Wbad-function-cast -Wcast-align -Wcast-qual -Wconversion -Wformat=2
-Wformat-signedness -Wmissing-declarations -Wmissing-prototypes
-Wnested-externs -Wnull-dereference -Wold-style-definition
-Wpointer-arith -Wshadow -Wstrict-overflow=2 -Wstrict-prototypes
-Wundef -Wvla -Wwrite-strings -Wpedantic -Werror -fno-plt -pipe
--target=armv6-pc-linux-gnu --sysroot=/<pathTo>/sysroot
-mfloat-abi=soft -Wno-unused-command-line-argument -version-info 2:0:1
-Wl,--version-script,./libcrypt.map -Wl,-z,defs -Wl,-z,text
-Wl,-z,relro -Wl,-z,now -pipe --target=armv6-pc-linux-gnu
--sysroot=/<pathTo>/sysroot -o libcrypt.la -rpath /usr/lib
lib/libcrypt_la-alg-des-tables.lo lib/libcrypt_la-alg-des.lo
lib/libcrypt_la-alg-gost3411-2012-core.lo
lib/libcrypt_la-alg-gost3411-2012-hmac.lo
lib/libcrypt_la-alg-hmac-sha1.lo lib/libcrypt_la-alg-md4.lo
lib/libcrypt_la-alg-md5.lo lib/libcrypt_la-alg-sha1.lo
lib/libcrypt_la-alg-sha256.lo lib/libcrypt_la-alg-sha512.lo
lib/libcrypt_la-alg-yescrypt-common.lo
lib/libcrypt_la-alg-yescrypt-opt.lo lib/libcrypt_la-crypt-bcrypt.lo
lib/libcrypt_la-crypt-des.lo lib/libcrypt_la-crypt-gensalt-static.lo
lib/libcrypt_la-crypt-gost-yescrypt.lo lib/libcrypt_la-crypt-md5.lo
lib/libcrypt_la-crypt-nthash.lo lib/libcrypt_la-crypt-pbkdf1-sha1.lo
lib/libcrypt_la-crypt-scrypt.lo lib/libcrypt_la-crypt-sha256.lo
lib/libcrypt_la-crypt-sha512.lo lib/libcrypt_la-crypt-static.lo
lib/libcrypt_la-crypt-sunmd5.lo lib/libcrypt_la-crypt-yescrypt.lo
lib/libcrypt_la-crypt.lo lib/libcrypt_la-util-base64.lo
lib/libcrypt_la-util-gensalt-sha.lo
lib/libcrypt_la-util-get-random-bytes.lo
lib/libcrypt_la-util-make-failure-token.lo
lib/libcrypt_la-util-xbzero.lo lib/libcrypt_la-util-xstrcpy.lo
lib/libcrypt_la-crypt-des-obsolete.lo
libtool: link: /<pathTo>/toolchain/bin/clang -shared  -fPIC -DPIC
lib/.libs/libcrypt_la-alg-des-tables.o lib/.libs/libcrypt_la-alg-des.o
lib/.libs/libcrypt_la-alg-gost3411-2012-core.o
lib/.libs/libcrypt_la-alg-gost3411-2012-hmac.o
lib/.libs/libcrypt_la-alg-hmac-sha1.o lib/.libs/libcrypt_la-alg-md4.o
lib/.libs/libcrypt_la-alg-md5.o lib/.libs/libcrypt_la-alg-sha1.o
lib/.libs/libcrypt_la-alg-sha256.o lib/.libs/libcrypt_la-alg-sha512.o
lib/.libs/libcrypt_la-alg-yescrypt-common.o
lib/.libs/libcrypt_la-alg-yescrypt-opt.o
lib/.libs/libcrypt_la-crypt-bcrypt.o lib/.libs/libcrypt_la-crypt-des.o
lib/.libs/libcrypt_la-crypt-gensalt-static.o
lib/.libs/libcrypt_la-crypt-gost-yescrypt.o
lib/.libs/libcrypt_la-crypt-md5.o lib/.libs/libcrypt_la-crypt-nthash.o
lib/.libs/libcrypt_la-crypt-pbkdf1-sha1.o
lib/.libs/libcrypt_la-crypt-scrypt.o
lib/.libs/libcrypt_la-crypt-sha256.o
lib/.libs/libcrypt_la-crypt-sha512.o
lib/.libs/libcrypt_la-crypt-static.o
lib/.libs/libcrypt_la-crypt-sunmd5.o
lib/.libs/libcrypt_la-crypt-yescrypt.o lib/.libs/libcrypt_la-crypt.o
lib/.libs/libcrypt_la-util-base64.o
lib/.libs/libcrypt_la-util-gensalt-sha.o
lib/.libs/libcrypt_la-util-get-random-bytes.o
lib/.libs/libcrypt_la-util-make-failure-token.o
lib/.libs/libcrypt_la-util-xbzero.o
lib/.libs/libcrypt_la-util-xstrcpy.o
lib/.libs/libcrypt_la-crypt-des-obsolete.o    -Werror
--sysroot=/<pathTo>/sysroot -mfloat-abi=soft -Wl,--version-script
-Wl,./libcrypt.map -Wl,-z -Wl,defs -Wl,-z -Wl,text -Wl,-z -Wl,relro
-Wl,-z -Wl,now --sysroot=/<pathTo>/sysroot   -Wl,-soname
-Wl,libcrypt.so.1 -o .libs/libcrypt.so.1.1.0
```

Note how `--target=armv6-pc-linux-gnu --sysroot=<...>` was set with
the first clang command, but only `--sysroot` exists with the
subsequent clang command for linking.

Message #8 received at 78854 <at> debbugs.gnu.org (full text, mbox):

From: Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
To: NR <nroycea+gnu <at> gmail.com>, 78854 <at> debbugs.gnu.org
Subject: Re: bug#78854: Cross-Compiling: ld.lld - "clang_rt.crtbegin.o is
 incompatible with elf32-littlearm"
Date: Wed, 2 Jul 2025 21:34:27 +0300

[Message part 1 (text/plain, inline)]

On 21/06/2025 02:27, NR wrote:
> For some reason, libtool isn't specifying the target for ld.lld:
> ld.lld: error: /<pathTo>/toolchain/lib/clang/21/lib/x86_64-unknown-linux-gnu/clang_rt.crtbegin.o
> is incompatible with elf32-littlearm
> 
> Note how `--target=armv6-pc-linux-gnu --sysroot=<...>` was set with
> the first clang command, but only `--sysroot` exists with the
> subsequent clang command for linking.

Thank you for your bug report! I think this is an easy fix to have the
"--target" flag passed through libtool. Would you test the attached
diff? It is based on the development branch, so it may not apply.

-- 
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

[handle-target-architecture-flag.diff (text/x-patch, attachment)]

[OpenPGP_0x6570EA01146F7354.asc (application/pgp-keys, attachment)]

[OpenPGP_signature.asc (application/pgp-signature, attachment)]

Message #11 received at 78854 <at> debbugs.gnu.org (full text, mbox):

From: Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
To: 78854 <at> debbugs.gnu.org
Cc: NR <nroycea+gnu <at> gmail.com>
Subject: Re: bug#78854: Cross-Compiling: ld.lld - "clang_rt.crtbegin.o is
 incompatible with elf32-littlearm"
Date: Mon, 14 Jul 2025 18:51:24 +0300

[Message part 1 (text/plain, inline)]

On 03/07/2025 09:51, NR wrote:
> Yeah, that worked out fine and the build completed.

Thank you for testing! The patch has been applied to the development
branch.

https://cgit.git.savannah.gnu.org/cgit/libtool.git/commit/?h=development&id=58f12166a05e8041de34a3c90cf01d9c283124fc

-- 
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

[OpenPGP_0x6570EA01146F7354.asc (application/pgp-keys, attachment)]

[OpenPGP_signature.asc (application/pgp-signature, attachment)]

Message #16 received at 78854-done <at> debbugs.gnu.org (full text, mbox):

From: Ileana Dumitrescu <ileanadumitrescu95 <at> gmail.com>
To: 78854-done <at> debbugs.gnu.org
Subject: bug#78854: Cross-Compiling: ld.lld - "clang_rt.crtbegin.o is
 incompatible with elf32-littlearm"
Date: Fri, 8 Aug 2025 17:54:28 +0300

[Message part 1 (text/plain, inline)]

This is applied in the master branch now, so closing.

https://cgit.git.savannah.gnu.org/cgit/libtool.git/commit/?id=9c7772f8a6924ff0d1ad6385e12c56baed96dd71

-- 
Ileana Dumitrescu

GPG Public Key: FA26 CA78 4BE1 8892 7F22 B99F 6570 EA01 146F 7354

[OpenPGP_0x6570EA01146F7354.asc (application/pgp-keys, attachment)]

[OpenPGP_signature.asc (application/pgp-signature, attachment)]

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