[llvm-dev] LLVM linking problem

[Russell Wallace via llvm-dev]

Done.

https://llvm.org/bugs/show_bug.cgi?id=24847

On Wed, Sep 16, 2015 at 6:26 PM, Reid Kleckner <rnk at google.com> wrote:

> That's pretty neat. Can you file a bug and attach a compressed version of
> a.ll? It looks like link.exe has interesting ordering constraints around
> associative COMDATs that we haven't run into before.
>
> On Wed, Sep 16, 2015 at 9:15 AM, Russell Wallace via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> When I use clang on Windows to compile a program using regular
>> expressions to intermediate code, then run the result through llvm-link and
>> finally try to generate an executable, I get an error.
>>
>> All of these ingredients are necessary; it works if the program doesn't
>> use regular expressions, and it works if I compile it directly instead of
>> going via intermediate code.
>>
>> The use of the exact llvm-link binary, however, is not a necessary
>> ingredient; I get the same result with a linking program of my own that
>> uses the same libraries as llvm-link.
>>
>> Minimal test case:
>>
>> C:\test>type test.cpp
>> #include <regex>
>>
>> int main() {
>>   std::cmatch m;
>>   regex_match("a", m, std::regex("a"));
>>   return 0;
>> }
>>
>> C:\test>clang-cl -Xclang -emit-llvm -c -fms-compatibility-version=19
>> test.cpp
>>
>> C:\test>move test.obj test.ll
>> Overwrite C:\test\test.ll? (Yes/No/All): y
>>         1 file(s) moved.
>>
>> C:\test>llvm-link test.ll -o=a.ll
>>
>> C:\test>clang-cl -Wno-override-module a.ll
>> a-e22d14.obj : fatal error LNK1243: invalid or corrupt file: COMDAT
>> section 0x373 associated with following section 0x389
>> clang-cl.exe: error: linker command failed with exit code 1243 (use -v to
>> see invocation)
>>
>> C:\test>llvm-link -version
>> LLVM (http://llvm.org/):
>>   LLVM version 3.7.0
>>   DEBUG build.
>>   Default target: x86_64-pc-windows-msvc
>>   Host CPU: sandybridge
>>
>>
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>>
>>
>
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