<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/59669>59669</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
Unresolved External Symbol
</td>
</tr>
<tr>
<th>Labels</th>
<td>
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
HideakiAtsuyo
</td>
</tr>
</table>
<pre>
Hello, I want to compile a simple cpp file using `SysAllocateString` from `oleaut32` but I can't find how to link this lib
The commands I'm using to compile:
```
clang++ -c -o dllCode.o dllCode.cpp -v
clang++ -shared -v -o US_Rtm.dll dllCode.o
```
Error: `error LNK2019: unresolved external symbol __imp_SysAllocString referenced in function GS`
<details>
<summary> Full Logs </summary>
```
clang version 15.0.6
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin
(in-process)
"C:\\Program Files\\LLVM\\bin\\clang++.exe" -cc1 -triple x86_64-pc-windows-msvc19.35.32019 -emit-obj -mrelax-all -mincremental-linker-compatible --mrelax-relocations -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name dllCode.cpp -mrelocation-model pic -pic-level 2 -mframe-pointer=none -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -mllvm -treat-scalable-fixed-error-as-warning -v "-fcoverage-compilation-dir=C:\\Users\\Hide\\Desktop\\Development\\VisualStudio\\UnmanagedStringsWithDLLV2\\Release" -resource-dir "C:\\Program Files\\LLVM\\lib\\clang\\15.0.6" -internal-isystem "C:\\Program Files\\LLVM\\lib\\clang\\15.0.6\\include" -internal-isystem "C:\\Program Files\\Microsoft Visual Studio\\2022\\Preview\\VC\\Tools\\MSVC\\14.35.32019\\include" -internal-isystem "C:\\Program Files\\Microsoft Visual Studio\\2022\\Preview\\VC\\Tools\\MSVC\\14.35.32019\\atlmfc\\include" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22621.0\\ucrt" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22621.0\\shared" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22621.0\\um" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22621.0\\winrt" -internal-isystem "C:\\Program Files (x86)\\Windows Kits\\10\\Include\\10.0.22621.0\\cppwinrt" -fdeprecated-macro "-fdebug-compilation-dir=C:\\Users\\Hide\\Desktop\\Development\\VisualStudio\\UnmanagedStringsWithDLLV2\\Release" -ferror-limit 19 -fmessage-length=120 -fno-use-cxa-atexit -fms-extensions -fms-compatibility -fms-compatibility-version=19.35.32019 -std=c++14 -fdelayed-template-parsing -fcxx-exceptions -fexceptions -fcolor-diagnostics -faddrsig -o dllCode.o -x c++ dllCode.cpp
clang -cc1 version 15.0.6 based upon LLVM 15.0.6 default target x86_64-pc-windows-msvc
#include "..." search starts here:
#include <...> search starts here:
C:\Program Files\LLVM\lib\clang\15.0.6\include
C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32019\include
C:\Program Files\Microsoft Visual Studio\2022\Preview\VC\Tools\MSVC\14.35.32019\atlmfc\include
C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt
C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\shared
C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\um
C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\winrt
C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\cppwinrt
End of search list.
clang version 15.0.6
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin
"C:\\Program Files\\Microsoft Visual Studio\\2022\\Preview\\VC\\Tools\\MSVC\\14.35.32019\\bin\\Hostx64\\x64\\link.exe" -out:US_Rtm.dll -defaultlib:libcmt -defaultlib:oldnames "-libpath:C:\\Program Files\\Microsoft Visual Studio\\2022\\Preview\\VC\\Tools\\MSVC\\14.35.32019\\lib\\x64" "-libpath:C:\\Program Files\\Microsoft Visual Studio\\2022\\Preview\\VC\\Tools\\MSVC\\14.35.32019\\atlmfc\\lib\\x64" "-libpath:C:\\Program Files (x86)\\Windows Kits\\10\\Lib\\10.0.22621.0\\ucrt\\x64" "-libpath:C:\\Program Files (x86)\\Windows Kits\\10\\Lib\\10.0.22621.0\\um\\x64" "-libpath:C:\\Program Files\\LLVM\\lib\\clang\\15.0.6\\lib\\windows" -nologo -dll -implib:US_Rtm.lib dllCode.o
Creating library US_Rtm.lib and object US_Rtm.exp
dllCode.o : error LNK2019: unresolved external symbol __imp_SysAllocString referenced in function GS
US_Rtm.dll : fatal error LNK1120: 1 unresolved externals
clang++: error: linker command failed with exit code 1120 (use -v to see invocation)
```
\==========
</details>
<details>
<summary> GS Function Screenshot </summary>
No this function will not stay like this, waiting to get this compiling & working before doing the necessary modifications.
\==========
</details>
Thanks for your time !
Regards.
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJzUWFlz2zgS_jX0SxdYImjJ1oMeHCmepMYztRXneEyBQJPCGAcLAHXsr99qkjrsdTKz2fE6W6WSwCbU3ejj60aLGHXjEBfZ9E02XV2ILq19WLzTCsWDvkmx2_uLyqv94h0a4zO-hPewFS5B8iC9bbVBEBC1bQ2CbFuoidJF7RrIZpP7fbwxxkuR8D4F7ZpsNoE6eEsvvUHRpZITreoSvAcpXMavEtTaKVj7LUkx2j1AWusIRlfZZJVNbobvj2skFaxwKsL7jF_ZUe5Jtawc92azyfjpH6URrsn4m4y_ASaBeVDGLL3C_LSiw7DNM_vjWgRUwDb0v0_3Xz8kmytjTiyeFTl8vw3Bh6y8oeMjreHu91_5pJgTrXMBozcbVIC7hMEJA3FvK2_g61dt268Haw6mhIA1BnQSFWgHdedk0t7BL_dPhD76LpcKk9AmZuXbgQSQlcvYWSvCPivfwm1nDNz5JhI947enV48YPWNR2GCIpEIxzSf5bHSTCA0mOt_uevZ1dslaybbaKb-NzMaNPDgzoFBgvUJDe1sf9W549d7FJIxBtdK96Zbk1enyH8E3QVi41QZjNl3e3X3-LZsuK-3GY2X8WjvWBi8xxozPj2Q-cniGyYnPyKpfnLk_xx1mnAOTsgCWgqa4f_5gxTwvp3lJ3gWGVifmqz-A2YBG7JgwBpjVTga06JIwjAIdA6PQFUlXBoEdNgfsc0h7F4EpHUVlkNUBEZg0KAITMbEKax-QVUI-oFOnfcZsLNtg0LXG0JOlCIpthOmQOWExArNCO0ap2xMe54A9SWe9f6DVElirJTO4QQMcmK2DsMhar13CkJUr5x0Cq61Ia4YhOA-srlsmvUtByJSVK--A1c6z4DuntGsY7QVmpXcxhU4mH5gwWkTSr-4cmZYlOlHMyhUHlvrAYrLtyAFsdgksdQ57QoMOA2lp6fTkKBSJRSnMYDq9Q8X6BGQisq0IjhKKbSg6WC39BoNokA0wMhxdUfStTqHzKWIYQ4bgclitMD4k3x4eNmh8S-4dCJ917IS5T53SfmTirHCiQTWkdPyi03p1d_eZD68_oEERh4AjbOiCRFLkPwhiAs2zIO6XY3oS195fThim4z4mtH8P536tnTSdwh8T85uWwUdfJxiMBudW4xPOD__EjcbtaN7l8PvRe3Ngc38gFpfHbPy_UE8kY2v5X6lKCLi7nhH09S-_DOAEv-o0yi8mw-_7UcBIzCc55zNe5OPrTob0asKHcvt6Z7evJnqr3SvaXbbtSYFaYRuQ2jjFrJDBD0CpsOqanwol6wHUjbY6ARXe2mKMhOUGXZPWWbkq-GSoPF1EJneCiYQ7nWhrZNR4uTgUWno-VGNtdNo_Q2Jjy0N8z-t9TCorV3JoGorL3oJG7FGxhLY1IiFrRejbVVbL3Y7hTmI7Vvj60YP0xgemtGicj0lLogmlQtTN486V7WAUeF7Az_uzvmt53KRBJSIq6FrvgLD9QFZYi84kGKrsd3u3jJcjQlFU5HlOnogoglxDTCKkCGsMZ8342f5ySfvLt9_b_ycd31CHDkXoWIEOoPldFt_G8RHETwj--Ry7R-B-jNr_e4nHIvHnoh_hwhNQ6BHhBAdPsKBH_5dgPCL7i-hsX4TtAIgvwfmItsM10Snw9SEnjI4p_4mvWa_dKh3vae98TLvZ5fBwXNC96nht8x3Z6OzWzkagIxQpb4yupE1PiN6o4ZpENc_oqhVUR25e-dTH9psOyvnPpdx59_pDiv71NubuwP4bfesribY_6py_fsE6vh_zvA9w541vPLA-trVthxAeA97o6umYCgCWdDmmTsToKoiwh7PdgpCo-gNlOlBxN7YUp8aD4OIFp1m9tLOUJe61SMKchBYFnxC5eE5s_Lch3lFhWgxzl8MoEWqhDSrY6rSGvi-UXiGQAAqMLiKwDSQPERG024yTkeN86dmxH7mpXH3vcxjOZfz26Xzu24O7x3O7X-7h9mC1exkQXVz79P0hHi-GwW_Gr9cptZECk99m_Fbn2jZdyKW3Gb_9Yst_fpl-yVsy4Pycw-9-mM0e_bXVxoDziTq5PRj9gP2GjC9hK3Qa57PUUvb_G-4O_bSYz2DrwwOth1EWKN9vXyM4lNTGhz2VLl3rcRiW_23m_bgW7iFC7QPsfRcgaUvdbDG8_YCNCCrmF2pRqnk5Fxe4KGZXxdVsOp-VF-tFMakrdVVWZTWZzK-v-VUh6ktRzqalqHgxubrQC8LVgvNyUvLZpMyrSz69vJaSl1e1mpd1djlBK7TJjdnY3IfmQsfY4WI6n83mF0ZUaOJhSh8W_Uyv6pqYXU6oPYinvyWdDC4-ndLg7SH77vvsu-iCWTx2dqPTuqtGXxOj8Ye1wVPqUzyQMjHjt70-_woAAP__gx1bYQ">