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ReadMe: Mac deployment workaround, new PM example #948

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Oct 19, 2023
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ReadMe: Mac deployment workaround, new PM example #948

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b567fe0
Example for Mac with the new pass manager and a real file.
FlashSheridan Oct 17, 2023
eeb3155
Troubleshooting suggestion for Mac dynamic_lookup/
FlashSheridan Oct 18, 2023
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14 changes: 13 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -89,10 +89,14 @@ $LLVM2_BUILD/bin/opt -load $ALIVE2_HOME/alive2/build/tv/tv.so -load-pass-plugin
```


On a Mac:
On a Mac with the old pass manager:
```
$LLVM2_BUILD/bin/opt -load $ALIVE2_HOME/alive2/build/tv/tv.dylib -load-pass-plugin $ALIVE2_HOME/alive2/build/tv/tv.dylib -tv -instcombine -tv -o /dev/null foo.ll
```
On a Mac with the new pass manager:
```
$LLVM2_BUILD/bin/opt -load $ALIVE2_HOME/alive2/build/tv/tv.dylib -load-pass-plugin $ALIVE2_HOME/alive2/build/tv/tv.dylib -passes=tv -passes=instcombine -passes=tv -o /dev/null $LLVM2_HOME/llvm/test/Analysis/AssumptionCache/basic.ll
```
You can run any pass or combination of passes, but on the command line
they must be placed in between the two invocations of the Alive2 `-tv`
pass.
Expand Down Expand Up @@ -301,6 +305,14 @@ If you want to use this functionality, you will need to manually start
and stop, as appropriate, a Redis server instance on localhost. Alive2
should be the only user of this server.

Troubleshooting
--------
Some combinations of Clang and MacOS versions may give link warnings
“-undefined dynamic_lookup may not work with chained fixups,” and
runtime errors with “symbol not found in flat namespace.” Setting
[CMAKE_OSX_DEPLOYMENT_TARGET](https://cmake.org/cmake/help/latest/variable/CMAKE_OSX_DEPLOYMENT_TARGET.html) as a cache entry to 11.0
or less at the beginning of CMakeLists.txt may work around this.

LLVM Bugs Found by Alive2
--------

Expand Down