Linkage error when cross-compiling for `aarch64-pc-windows-msvc`

[rami3l]

Problem:

Originally posted as rustls/rustls-platform-verifier#101, but it turns out it's actually an aws_lc_rs-related issue.

In short, in rust-lang/rustup#3898 we (the Rustup team) are trying to replace the ring backend with aws-lc-rs as a part of Rustup's plan to ship the rustls backend by default (rust-lang/rustup#3806).

When cross-compiling for aarch64-pc-windows-msvc from GitHub's official Windows CI runner however, the following error was generated (see the full error log in the foldable section below):

LINK : warning LNK4098: defaultlib 'msvcrtd.lib' conflicts with use of other libs; use /NODEFAULTLIB:library
LINK : warning LNK4286: symbol '_wassert' defined in 'libucrt.lib(assert.obj)' is imported by 'libaws_lc_sys-0a41df4d7545123e.rlib(bio.c.obj)'
LINK : warning LNK4286: symbol '_wassert' defined in 'libucrt.lib(assert.obj)' is imported by 'libaws_lc_sys-0a41df4d7545123e.rlib(printf.c.obj)'
[..]
LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(chacha.c.obj)'
[..]
libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_ftell referenced in function file_ctrl
libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp__setmode referenced in function file_ctrl
oldnames.lib(strdup.obi) : error LNK2001: unresolved external symbol __imp__strdup
D:\a\rustup\rustup\target\aarch64-pc-windows-msvc\debug\deps\rustls_platform_verifier-824047c6ba53f86f.dll : fatal error LNK1120: 18 unresolved externals

Full Error log

Compiling rustls-platform-verifier v0.3.1
error: linking with `link.exe` failed: exit code: 1120
  |
  = note: "C:\\Program Files\\Microsoft Visual Studio\\2022\\Enterprise\\VC\\Tools\\MSVC\\14.40.33807\\bin\\HostX64\\arm64\\link.exe" "/DEF:C:\\Users\\RUNNER~1\\AppData\\Local\\Temp\\rustcjxMRYi\\lib.def" "/NOLOGO" "C:\\Users\\RUNNER~1\\AppData\\Local\\Temp\\rustcjxMRYi\\symbols.o" "D:\\a\\rustup\\rustup\\target\\aarch64-pc-windows-msvc\\debug\\deps\\rustls_platform_verifier-824047c6ba53f86f.rustls_platform_verifier.d3754e06d5d23fde-cgu.0.rcgu.o" "D:\\a\\rustup\\rustup\\target\\aarch64-pc-windows-msvc\\debug\\deps\\rustls_platform_verifier-824047c6ba53f86f.2kbvfqg2xu4cad5i.rcgu.o" "/LIBPATH:D:\\a\\rustup\\rustup\\target\\aarch64-pc-windows-msvc\\debug\\deps" "/LIBPATH:D:\\a\\rustup\\rustup\\target\\debug\\deps" "/LIBPATH:D:\\a\\rustup\\rustup\\target\\aarch64-pc-windows-msvc\\debug\\build\\aws-lc-sys-62247e93288e9cb7\\out\\build\\artifacts\\" "/LIBPATH:C:\\Users\\runneradmin\\.rustup\\toolchains\\stable-x86_64-pc-windows-msvc\\lib\\rustlib\\aarch64-pc-windows-msvc\\lib" "D:\\a\\rustup\\rustup\\target\\aarch64
  = note:    Creating library D:\a\rustup\rustup\target\aarch64-pc-windows-msvc\debug\deps\rustls_platform_verifier-824047c6ba53f86f.dll.lib and object D:\a\rustup\rustup\target\aarch64-pc-windows-msvc\debug\deps\rustls_platform_verifier-824047c6ba53f86f.dll.exp
          LINK : warning LNK4098: defaultlib 'msvcrtd.lib' conflicts with use of other libs; use /NODEFAULTLIB:library
          LINK : warning LNK4286: symbol 'abort' defined in 'libucrt.lib(abort.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(obj.c.obj)'
          LINK : warning LNK4286: symbol 'abort' defined in 'libucrt.lib(abort.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(refcount_c11.c.obj)'
          LINK : warning LNK4286: symbol 'abort' defined in 'libucrt.lib(abort.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(ex_data.c.obj)'
          LINK : warning LNK4217: symbol 'abort' defined in 'libucrt.lib(abort.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj)' in function 'aws_lc_0_18_0_bn_mod_exp_mont_small'
          LINK : warning LNK4286: symbol 'abort' defined in 'libucrt.lib(abort.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj)'
          LINK : warning LNK4286: symbol 'abort' defined in 'libucrt.lib(abort.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(thread_win.c.obj)'
          LINK : warning LNK4286: symbol 'abort' defined in 'libucrt.lib(abort.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(windows.c.obj)'
          LINK : warning LNK4217: symbol 'malloc' defined in 'libucrt.lib(malloc.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj)' in function 'bn_less_than_word_mask'
          LINK : warning LNK4286: symbol 'malloc' defined in 'libucrt.lib(malloc.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(mem.c.obj)'
          LINK : warning LNK4286: symbol 'malloc' defined in 'libucrt.lib(malloc.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj)'
          LINK : warning LNK4286: symbol 'malloc' defined in 'libucrt.lib(malloc.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(thread_win.c.obj)'
          LINK : warning LNK4217: symbol '__acrt_iob_func' defined in 'libucrt.lib(_file.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj)' in function 'aws_lc_0_18_0_handle_cpu_env'
          LINK : warning LNK4217: symbol 'free' defined in 'libucrt.lib(free.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj)' in function 'ctr32_add'
          LINK : warning LNK4286: symbol 'free' defined in 'libucrt.lib(free.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(mem.c.obj)'
          LINK : warning LNK4286: symbol 'free' defined in 'libucrt.lib(free.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj)'
          LINK : warning LNK4286: symbol 'free' defined in 'libucrt.lib(free.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(thread_win.c.obj)'
          LINK : warning LNK4217: symbol 'fflush' defined in 'libucrt.lib(fflush.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj)' in function 'check_test'
          LINK : warning LNK4286: symbol 'fflush' defined in 'libucrt.lib(fflush.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(pq_custom_randombytes.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(kyber512r3_ref.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(kyber768r3_ref.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(kyber1024r3_ref.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(ml_kem_512_ipd.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(kem.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(printf.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(kem_methods.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(kem_kyber.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_hmac_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(print.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bio.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_dsa_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_ed25519_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_x25519_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_kem_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_x25519.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_kem.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_rsa_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_ec_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(err_data.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(a_object.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(lhash.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_ed25519.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(convert.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(dsa_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(posix_time.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(poly1305.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(rsa_crypt.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(curve25519_nohw.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bn_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(asn1_compat.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(p_methods.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(dsa.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(rsassa_pss_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(ripemd.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(refcount_c11.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(engine.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(ex_data.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(obj_xref.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(forkunsafe.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(windows.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(obj.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(cpucap.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(e_chacha20poly1305.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(thread_win.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(stack.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(rsa_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(mem.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(cbs.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(e_aesgcmsiv.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(cbb.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(ec_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(evp_asn1.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(crypto.c.obj)'
          LINK : warning LNK4217: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj)' in function '_vsnprintf_l'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(chacha.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(curve25519.c.obj)'
          LINK : warning LNK4286: symbol '__stdio_common_vsprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(ecdsa_asn1.c.obj)'
          LINK : warning LNK4217: symbol '__stdio_common_vfprintf' defined in 'libucrt.lib(output.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj)' in function '_vfprintf_l'
          LINK : warning LNK4217: symbol 'qsort' defined in 'libucrt.lib(qsort.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(cbb.c.obj)' in function 'aws_lc_0_18_0_CBB_flush_asn1_set_of'
          LINK : warning LNK4217: symbol '_errno' defined in 'libucrt.lib(errno.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(mem.c.obj)' in function 'aws_lc_0_18_0_OPENSSL_vasprintf_internal'
          LINK : warning LNK4286: symbol '_errno' defined in 'libucrt.lib(errno.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj)'
          LINK : warning LNK4286: symbol '_errno' defined in 'libucrt.lib(errno.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj)'
          LINK : warning LNK4217: symbol 'fclose' defined in 'libucrt.lib(fclose.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj)' in function 'aws_lc_0_18_0_BIO_new_file'
          LINK : warning LNK4217: symbol '_fileno' defined in 'libucrt.lib(fileno.obj)' is imported by 'libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj)' in function 'file_ctrl'
          libaws_lc_sys-2799e0ca1159a8ce.rlib(bio.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(printf.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(posix_time.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(poly1305.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(a_object.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(lhash.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(curve25519_nohw.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(asn1_compat.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(convert.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(dsa_asn1.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(stack.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(engine.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(ex_data.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(ripemd.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(mem.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(cbs.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(e_chacha20poly1305.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(chacha.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(cbb.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(rsa_asn1.c.obj) : error LNK2001: unresolved external symbol __imp__wassert
          libaws_lc_sys-2799e0ca1159a8ce.rlib(bcm.c.obj) : error LNK2019: unresolved external symbol __imp___stdio_common_vsscanf referenced in function _vsscanf_l
          libaws_lc_sys-2799e0ca1159a8ce.rlib(mem.c.obj) : error LNK2019: unresolved external symbol __imp_realloc referenced in function aws_lc_0_18_0_OPENSSL_vasprintf_internal
          libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj) : error LNK2019: unresolved external symbol __imp_strerror referenced in function err_reason_error_string
          libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj) : error LNK2019: unresolved external symbol __imp_fputs referenced in function print_errors_to_file
          libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj) : error LNK2019: unresolved external symbol __imp_strdup referenced in function aws_lc_0_18_0_ERR_set_error_data
          oldnames.lib(strdup.obi) : error LNK2001: unresolved external symbol __imp_strdup
          libaws_lc_sys-2799e0ca1159a8ce.rlib(err.c.obj) : error LNK2019: unresolved external symbol __imp_bsearch referenced in function aws_lc_0_18_0_ERR_restore_state
          libaws_lc_sys-2799e0ca1159a8ce.rlib(obj.c.obj) : error LNK2001: unresolved external symbol __imp_bsearch
          libaws_lc_sys-2799e0ca1159a8ce.rlib(stack.c.obj) : error LNK2019: unresolved external symbol __imp_qsort_s referenced in function aws_lc_0_18_0_OPENSSL_sk_sort
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_fopen referenced in function aws_lc_0_18_0_BIO_new_file
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_fwrite referenced in function file_write
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_fread referenced in function file_read
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_ferror referenced in function file_read
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_fgets referenced in function file_gets
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_fseek referenced in function file_ctrl
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_feof referenced in function file_ctrl
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_ftell referenced in function file_ctrl
          libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp__setmode referenced in function file_ctrl
          oldnames.lib(strdup.obi) : error LNK2001: unresolved external symbol __imp__strdup
          D:\a\rustup\rustup\target\aarch64-pc-windows-msvc\debug\deps\rustls_platform_verifier-824047c6ba53f86f.dll : fatal error LNK1120: 18 unresolved externals
          
error: could not compile `rustls-platform-verifier` (lib) due to 1 previous error

You can also go to https://github.com/rust-lang/rustup/actions/runs/9624188283/job/26547561849 for the full CI log.

In addition, to prove that this actually has nothing to do with rustls-platform-verifier, another build error without the latter was reproduced in rust-lang/rustup#3917 as https://github.com/rust-lang/rustup/actions/runs/9708177268/job/26794554219.

Relevant details

The lockfile includes the following versions for aws-lc-* dependencies:

[[package]]
name = "aws-lc-fips-sys"
version = "0.12.9"

[[package]]
name = "aws-lc-rs"
version = "1.7.3"

[[package]]
name = "aws-lc-sys"
version = "0.18.0"

System information for the official GitHub runner in question:

Current runner version: '2.317.0'
Operating System
  Microsoft Windows Server 2022
  10.0.20348
  Datacenter
Runner Image
  Image: windows-2022
  Version: 20240624.1.0
  Included Software: https://github.com/actions/runner-images/blob/win22/20240624.1/images/windows/Windows2022-Readme.md
  Image Release: https://github.com/actions/runner-images/releases/tag/win22%2F20240624.1
Runner Image Provisioner
  2.0.370.1

Another interesting detail is that this seems to work without issues when compiling natively on an ARM64 Windows machine:

I was able to compile and run the tests for rustls-platform-verifier in an ARM64 Windows 11 VM with the aws_lc_rs backend earlier today. The steps I took to setup the environment were:

• Installed the latest CMake from their website
• Installed the latest Ninja from GitHub releases
• Download the latest Visual Studio 2022 Tools installer
• Installed these components:
  • Windows 11 SDK
  • MSVC v143 C++ ARM64 build tools

I then:

• Edited rustls-platform-verifier's main branch to use aws_lc_rs everywhere ring currently is
• Ran cargo test.

With this setup, I don't get the errors you reported FWIW. @ctz mentioned this in the project Discord but it looks like there isn't a compatible ucrt available to your build since all the missing symbols should be coming from it. I saw the VS installer install a ARM64 ucrt implementation, so maybe that's part of what's missing?
Originally posted by @complexspaces in rustls/rustls-platform-verifier#101 (comment)

Many thanks in advance!

[justsmth]

Thanks for the report. I'll try to reproduce this.

For reference, we do have a CI job that tests cross-compiling to aarch64-pc-windows-msvc -- this test might need to be expanded to include more variety in its build options.

[justsmth]

To help get some clarity, I'll narrow my focus to just that first error you listed:

libaws_lc_sys-2799e0ca1159a8ce.rlib(file.c.obj) : error LNK2019: unresolved external symbol __imp_ftell referenced in function file_ctrl

From what I can tell, this relates to the inability for the linker to resolve the ftell invocation here:

static long file_ctrl(BIO *b, int cmd, long num, void *ptr) {
...
    case BIO_CTRL_INFO:
      ret = ftell(fp);
      break;
...

On Windows, we're specifically including fcntl.h and io.h:

#if defined(OPENSSL_WINDOWS)
#include <fcntl.h>
#include <io.h>
#endif  // OPENSSL_WINDOWS

I'm not sure this gets us any close to a root-cause, but for ftell we should be including "stdio.h" (which we do directly above). I wonder if something in these windows-specific header files is renaming this symbol to __imp_ftell preventing it from being found by the linker.

[rami3l]

Thanks for the report. I'll try to reproduce this.

For reference, we do have a CI job that tests cross-compiling to aarch64-pc-windows-msvc -- this test might need to be expanded to include more variety in its build options.

@justsmth Thanks for the prompt response!

I'm aware that you have a CI workflow for this case, and that was the first thing for me to check out when I encountered this error just in case I'd missed something.

However, I realized that you really just built the lib. In our original build log, the linkage failure happened way beyond the point of building aws-lc-*, and that was why I originally reported the issue to rustls-platform-verifier.

[justsmth]

A possible lead -- I see some mingw headers with macro definitions that could create a __imp_ftell symbol:

❯ find . -name "*.h" | xargs grep __imp_
./mingw64/include/_mingw_mac.h:#  define __MINGW_IMP_SYMBOL(sym) __imp_##sym
./mingw64/include/_mingw_mac.h:#  define __MINGW_IMP_LSYMBOL(sym) __imp_##sym
./mingw64/include/_mingw_mac.h:#  define __MINGW_IMP_LSYMBOL(sym) __imp__##sym
./ucrt64/include/_mingw_mac.h:#  define __MINGW_IMP_SYMBOL(sym) __imp_##sym
./ucrt64/include/_mingw_mac.h:#  define __MINGW_IMP_LSYMBOL(sym) __imp_##sym
./ucrt64/include/_mingw_mac.h:#  define __MINGW_IMP_LSYMBOL(sym) __imp__##sym

Perhaps our build is picking up a MINGW header?

[rami3l]

Could it be related to this thread? https://learn.microsoft.com/en-us/answers/questions/576680/visual-studio-2017-c-linking-error-lnk2019-unresol

At least it does look like this has something to do with how the lib handles CRT.

[rami3l]

Could it be related to this thread? https://learn.microsoft.com/en-us/answers/questions/576680/visual-studio-2017-c-linking-error-lnk2019-unresol

At least it does look like this has something to do with how the lib handles UCRT.

Indeed, https://stackoverflow.com/a/3007915 and OpenMathLib/OpenBLAS#2825 also talk about /MT and /MD compiler options. I'm becoming more and more convinced that this info will help.

[justsmth]

Thanks for your help diagnosing this!

I suspect we should be using static_crt(true) with our CMake config: https://github.com/rust-lang/cmake-rs/blob/c4a60dd154dd90e469dffc41a1faa717704f90b3/src/lib.rs#L333

I'll put the change into this PR:

• Test more windows targets #452

[rami3l]

@justsmth Thanks! Tomorrow I should be able to add a patched dependency to point to the PR branch and see if your changes work for us.

[rami3l]

@justsmth I just tried again with the patched dependency and unfortunately the fix didn't work: https://github.com/rust-lang/rustup/actions/runs/9720192943/job/26831234964?pr=3917

And it's almost the same kind of error... I'm confused.

I wonder if it's possible to at least try to build the test binary (so in addition to the library itself) for ARM64 Windows and see if the linkage problem can be reproduced there?

[justsmth]

I wonder if it's possible to at least try to build the test binary (so in addition to the library itself) for ARM64 Windows and see if the linkage problem can be reproduced there?

Good idea. I'll try to set this up tomorrow.

[justsmth]

I added --all-targets in that PR to our CI's "cargo build" commands for arm64 Windows, but (unfortunately) it's not reproducing the build failure: https://github.com/aws/aws-lc-rs/actions/runs/9734469537/job/26862526216?pr=452. :-(

Please let me know any guidance you might have related to reproducing these build problems locally. I'll work tomorrow on trying to reproduce this and the other (AT_HWCAP2) build failure.

[rami3l]

@justsmth Thanks anyway for having tried!

I still believe there's a CRT conflict somewhere but I'm not sure what kind of conflict it is... I cross-checked our setups for the Windows compilation tests and frankly speaking I cannot find any significant differences...

Maybe @ChrisDenton can shed a light on this issue? (x_x)

[ChrisDenton]

I've not looked into this yet but I can perhaps give some more information on the MSVC C runtime.

There are essentially four mutually exclusive C runtime libraries. Scroll down that page to the table that lists /MT etc. I'll reproduce some of it here with some Rust notes:

lib	C option	Rust
libcmt.lib	/MT	target_feature=+crt_static
libcmtd.lib	/MTd	N/A
msvcrt.lib	/MD	the default
msvcrtd.lib	/MDd	N/A

All libraries and the final binary should use the same CRT, whether they're compiled in C/C++ or Rust. Stable Rust does not currently support the debug CRTs (the ones ending in d) but you might be able to override it by explicitly linking one of them so that the linker sees it first.

In nightly you can use, for example, /nodefaultlib:msvcrt to disable the default before adding the one you need.