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readme: Mention the common error when the compiler_rt builtins have been omitted by libtool

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Martin Storsjö committed 2019-08-13 12:55:59 +03:00
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@@ -108,7 +108,9 @@ normal GCC/binutils based MinGW.
(This was fixed in qmake in [v5.12.0](https://code.qt.io/cgit/qt/qtbase.git/commit/?id=d92c25b1b4ac0423a824715a08b2db2def4b6e25), to use response (This was fixed in qmake in [v5.12.0](https://code.qt.io/cgit/qt/qtbase.git/commit/?id=d92c25b1b4ac0423a824715a08b2db2def4b6e25), to use response
files instead of linker script.) files instead of linker script.)
- Libtool based projects fail to link with llvm-mingw if the project contains - Libtool based projects fail to link with llvm-mingw if the project contains
C++. For such targets, libtool tries to detect which libraries to link C++. (This often manifests with undefined symbols like `___chkstk_ms`,
`__alloca` or `___divdi3`.)
For such targets, libtool tries to detect which libraries to link
by invoking the compiler with `$CC -v` and picking up the libraries that by invoking the compiler with `$CC -v` and picking up the libraries that
are linked by default, and then invoking the linker driver with `-nostdlib` are linked by default, and then invoking the linker driver with `-nostdlib`
and specifying the default libraries manually. In doing so, libtool fails and specifying the default libraries manually. In doing so, libtool fails