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Jonathan Brouwer a1d588b35e
Rollup merge of #150992 - cezarbbb:cstyle-export-rules2, r=bjorn3,petrochenkov 
link modifier `export-symbols`: export all global symbols from selected uptream c static libraries

In order to be able to export symbols from a specified upstream C static library, I redesigned a solution that, compared to a previous PR rust-lang/rust#150335 I submitted, will not have any extra symbols leaking out.

The following points should be noted:
 - This attribute will select and import the `Global` symbols of the first matching library it finds.
 - Developers should ensure that there are no libraries with the same name.
 - This modifier is only compatible with `static` linking kind
 - By default, upstream C static libraries will not export their `Global` symbols regardless of whether `LTO` optimization is enabled. However, after enabling this attribute, if the upstream C static library has `LTO` optimization enabled, the compiler will issue an error to inform the developer that the linked C library is invalid.

The test code is the same as the PR rust-lang/rust#150335.
Here are the results:
1. `cargo +include-libs rustc --release -- -L. -lstatic:+export-symbols=c_add`
(or you can use `#[link(name = "c_add", kind= "static", modifier = "+export-symbols")]` in the file)
```bash
                 U abort@GLIBC_2.2.5
                 U bcmp@GLIBC_2.2.5
0000000000014f60 T c_add
                 U calloc@GLIBC_2.2.5
                 U close@GLIBC_2.2.5
0000000000014f70 T c_sub
                 w __cxa_finalize@GLIBC_2.2.5
                 w __cxa_thread_atexit_impl@GLIBC_2.18
                 U dl_iterate_phdr@GLIBC_2.2.5
0000000000014ee0 T downstream_add
                 U __errno_location@GLIBC_2.2.5
                 U free@GLIBC_2.2.5
                 U fstat64@GLIBC_2.33
                 U getcwd@GLIBC_2.2.5
                 U getenv@GLIBC_2.2.5
                 w __gmon_start__
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
                 U lseek64@GLIBC_2.2.5
                 U malloc@GLIBC_2.2.5
                 U memcpy@GLIBC_2.14
                 U memmove@GLIBC_2.2.5
                 U memset@GLIBC_2.2.5
                 U mmap64@GLIBC_2.2.5
                 U munmap@GLIBC_2.2.5
                 U open64@GLIBC_2.2.5
                 U posix_memalign@GLIBC_2.2.5
                 U pthread_key_create@GLIBC_2.34
                 U pthread_key_delete@GLIBC_2.34
                 U pthread_setspecific@GLIBC_2.34
                 U read@GLIBC_2.2.5
                 U readlink@GLIBC_2.2.5
                 U realloc@GLIBC_2.2.5
                 U realpath@GLIBC_2.3
                 U stat64@GLIBC_2.33
                 w statx@GLIBC_2.28
                 U strlen@GLIBC_2.2.5
                 U syscall@GLIBC_2.2.5
                 U __tls_get_addr@GLIBC_2.3
                 U _Unwind_Backtrace@GCC_3.3
                 U _Unwind_DeleteException@GCC_3.0
                 U _Unwind_GetDataRelBase@GCC_3.0
                 U _Unwind_GetIP@GCC_3.0
                 U _Unwind_GetIPInfo@GCC_4.2.0
                 U _Unwind_GetLanguageSpecificData@GCC_3.0
                 U _Unwind_GetRegionStart@GCC_3.0
                 U _Unwind_GetTextRelBase@GCC_3.0
                 U _Unwind_RaiseException@GCC_3.0
                 U _Unwind_Resume@GCC_3.0
                 U _Unwind_SetGR@GCC_3.0
                 U _Unwind_SetIP@GCC_3.0
                 U write@GLIBC_2.2.5
                 U writev@GLIBC_2.2.5
```
3. `cargo +nightly rustc --release -- -L ./`
```bash
                 U abort@GLIBC_2.2.5
                 U bcmp@GLIBC_2.2.5
                 U calloc@GLIBC_2.2.5
                 U close@GLIBC_2.2.5
                 w __cxa_finalize@GLIBC_2.2.5
                 w __cxa_thread_atexit_impl@GLIBC_2.18
                 U dl_iterate_phdr@GLIBC_2.2.5
0000000000011e10 T downstream_add
                 U __errno_location@GLIBC_2.2.5
                 U free@GLIBC_2.2.5
                 U fstat64@GLIBC_2.33
                 U getcwd@GLIBC_2.2.5
                 U getenv@GLIBC_2.2.5
                 w gettid@GLIBC_2.30
                 w __gmon_start__
                 w _ITM_deregisterTMCloneTable
                 w _ITM_registerTMCloneTable
                 U lseek64@GLIBC_2.2.5
                 U malloc@GLIBC_2.2.5
                 U memcpy@GLIBC_2.14
                 U memmove@GLIBC_2.2.5
                 U memset@GLIBC_2.2.5
                 U mmap64@GLIBC_2.2.5
                 U munmap@GLIBC_2.2.5
                 U open64@GLIBC_2.2.5
                 U posix_memalign@GLIBC_2.2.5
                 U pthread_key_create@GLIBC_2.34
                 U pthread_key_delete@GLIBC_2.34
                 U pthread_setspecific@GLIBC_2.34
                 U read@GLIBC_2.2.5
                 U readlink@GLIBC_2.2.5
                 U realloc@GLIBC_2.2.5
                 U realpath@GLIBC_2.3
                 U stat64@GLIBC_2.33
                 w statx@GLIBC_2.28
                 U strlen@GLIBC_2.2.5
                 U syscall@GLIBC_2.2.5
                 U __tls_get_addr@GLIBC_2.3
                 U _Unwind_Backtrace@GCC_3.3
                 U _Unwind_GetDataRelBase@GCC_3.0
                 U _Unwind_GetIP@GCC_3.0
                 U _Unwind_GetIPInfo@GCC_4.2.0
                 U _Unwind_GetLanguageSpecificData@GCC_3.0
                 U _Unwind_GetRegionStart@GCC_3.0
                 U _Unwind_GetTextRelBase@GCC_3.0
                 U _Unwind_RaiseException@GCC_3.0
                 U _Unwind_Resume@GCC_3.0
                 U _Unwind_SetGR@GCC_3.0
                 U _Unwind_SetIP@GCC_3.0
                 U write@GLIBC_2.2.5
                 U writev@GLIBC_2.2.5
```

r? @bjorn3
2026-02-04 14:39:17 +01:00
..
assembly-llvm Move bigint helper tracking issues 2026-02-02 18:45:26 -05:00
auxiliary Rollup merge of #150368 - minicore-ordering, r=workingjubilee 2026-01-11 09:56:38 +01:00
build-std/configurations Test that -Zbuild-std=core works on a variety of profiles 2026-01-14 20:39:12 -05:00
codegen-llvm Rollup merge of #151958 - chahar-ritik:add-slp-vectorization-test, r=jieyouxu 2026-02-02 23:12:05 -05:00
codegen-units address review comments; fix CI 2026-01-01 19:17:11 -05:00
coverage coverage: Add a test case for a previously-unknown span mismatch 2026-02-03 22:53:38 +11:00
coverage-run-rustdoc
crashes error on unsized AnonConsts 2026-02-02 20:48:14 +01:00
debuginfo Auto merge of #150843 - fmease:dyn-ace, r=BoxyUwU 2026-01-22 01:56:41 +00:00
incremental Implement incremental caching for derive macro expansions 2026-01-16 07:36:36 +01:00
mir-opt Auto merge of #151622 - scottmcm:elide-more-transmutes, r=cjgillot 2026-01-31 20:42:37 +00:00
pretty Update uitests 2026-01-19 21:50:29 +01:00
run-make Rollup merge of #150992 - cezarbbb:cstyle-export-rules2, r=bjorn3,petrochenkov 2026-02-04 14:39:17 +01:00
run-make-cargo Update cargo submodule 2026-01-30 19:15:24 -05:00
rustdoc-gui Try to fix rustdoc-gui/globals.goml flakyness 2026-02-03 16:07:25 +01:00
rustdoc-html resolve: Mark items under ambigous imports as exported 2026-01-27 16:24:53 +03:00
rustdoc-js Auto merge of #149370 - Zalathar:rollup-6fkk5x4, r=Zalathar 2025-11-27 07:30:25 +00:00
rustdoc-js-std Explicitly export core and std macros 2026-01-13 08:47:48 +01:00
rustdoc-json resolve: Mark items under ambigous imports as exported 2026-01-27 16:24:53 +03:00
rustdoc-ui Rollup merge of #151449 - GuillaumeGomez:regression-test-for-151411, r=lolbinarycat 2026-01-28 21:10:54 +01:00
ui Rollup merge of #150992 - cezarbbb:cstyle-export-rules2, r=bjorn3,petrochenkov 2026-02-04 14:39:17 +01:00
ui-fulldeps Fix references and remove inner queries module 2026-02-03 21:32:52 +01:00
COMPILER_TESTS.md