| Issue |
91418
|
| Summary |
[clang][PCH] Initialization order issue after change to lazy initializer loading
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
wolfy1961
|
After commit [bc73ef0031](https://github.com/llvm/llvm-project/commit/bc73ef0031b50f7443615fef614fb4ecaaa4bd11) we see an incorrect initialization order with the attached code. This occurs with PCH use only.
With a vanilla native clang with the above commit on Ubuntu 22.04:
clang -fmath-errno -o t.pch -x c++-header t.h
clang -fmath-errno -S t.cpp -include-pch t.pch
clang -o t t.s -lm
./t
we get the expected
p:0.225000
a:7.589466
b:1.633843
A:7.589466 7.589466 7.589466 7.589466
B:1.633843 1.633843 1.633843 1.633843
But with
clang -fno-math-errno -o t.pch -x c++-header t.h
clang -fno-math-errno -S t.cpp -include-pch t.pch
clang -o t t.s -lm
./t
we get
p:0.225000
a:7.589466
b:1.633843
A:0.000000 0.000000 0.000000 0.000000
B:0.000000 0.000000 0.000000 0.000000
Looking at the code the vectors 'A' and 'B' are initialized before 'a' and 'b' in the failing example.
[init.zip](https://github.com/llvm/llvm-project/files/15242786/init.zip)
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