| Issue |
162427
|
| Summary |
[Clad + Enzyme][Apple M1] Assertion failed: (Loc.isValid()) in DeclTemplate.h:1937 when using clad::gradient<opts::use_enzyme>
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
Vedant2005goyal
|
When compiling and running a Clad + Enzyme test on Apple M1 with Clang 18.1.8, a segmentation fault occurs due to an assertion in DeclTemplate.h.
**Error Message:**
Assertion failed: (Loc.isValid() && "point of instantiation must be valid!"),
function setPointOfInstantiation, file DeclTemplate.h, line 1937.
**System Info:**
- macOS 15 (Darwin 25.0.0)
- Apple Silicon (M1)
- Clang version: 18.1.8 (built from llvm-project)
- Clad build: latest main branch
- Enzyme enabled
**Steps to Reproduce:**
**1. Test File (test/Enzyme/DifferentCladEnzymeDerivatives.C):**
// RUN: %cladclang %s -I%S/../../include -oDifferentCladEnzymeDerivatives.out | %filecheck %s
// RUN: ./DifferentCladEnzymeDerivatives.out
// REQUIRES: Enzyme
#include "clad/Differentiator/Differentiator.h"
#include <iostream>
double foo(double x, double y) {
return x * y;
}
int main() {
auto grad = clad::gradient(foo);
auto gradEnzyme = clad::gradient<clad::opts::use_enzyme>(foo);
double x = 3.0, y = 4.0;
double grads[2];
grad.execute(x, y, grads);
std::cout << grads[0] << " " << grads[1] << std::endl;
}
**2. Command:**
bash./runclad.sh test/Enzyme/DifferentCladEnzymeDerivatives.C
**3. Full Output:**
🔧 Compiling test/Enzyme/DifferentCladEnzymeDerivatives.C...
Assertion failed: (Loc.isValid() && "point of instantiation must be valid!"), function setPointOfInstantiation, file DeclTemplate.h, line 1937.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace, preprocessed source, and associated run script.
clang++: error: unable to execute command: Segmentation fault: 11
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 18.1.8 (https://github.com/llvm/llvm-project.git 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
Target: arm64-apple-darwin25.0.0
Thread model: posix
InstalledDir: /Users/vedantgoyal/Desktop/CODING/clad/./llvm-project/build/bin
**Diagnostic Files:**
[clang-18-2025-10-08-104848.txt](https://github.com/user-attachments/files/22759338/clang-18-2025-10-08-104848.txt)
[DifferentCladEnzymeDerivatives-4f9ddd.cpp](https://github.com/user-attachments/files/22759312/DifferentCladEnzymeDerivatives-4f9ddd.cpp)
[DifferentCladEnzymeDerivatives-4f9ddd.sh](https://github.com/user-attachments/files/22759311/DifferentCladEnzymeDerivatives-4f9ddd.sh)
**Note:** .crash file is renamed to .txt in order to upload it on github
**Shell script:** I have also attached the shell script that i used to compile and execute the code
#!/bin/zsh
set -e
CLANG=(ccache ./llvm-project/build/bin/clang++)
CLAD_LIB=./llvm-project/build/lib/clad.dylib
INCLUDE1=./llvm-project/llvm/include
INCLUDE2=./include
SRC=""
BASENAME=$(basename ${SRC%.*})
OUT=build_exe/${BASENAME}
mkdir -p build_exe
echo "🔧 Compiling $SRC..."
"${CLANG[@]}" -O0 -isysroot $(xcrun --show-sdk-path) \
-I$INCLUDE1 -I$INCLUDE2 \
-L./llvm-project/build/lib \
-fplugin=$CLAD_LIB \
-Xclang -load -Xclang $CLAD_LIB \
-o $OUT $SRC
echo "🚀 Running $OUT..."
./$OUT
**Expected Behavior:**
The code should compile successfully, allowing both gradient computation methods (standard Clad and Enzyme-based) to coexist in the same program.
**Additional Context:**
This appears to be related to template instantiation when mixing different Clad gradient backends in the same translation unit. The assertion occurs during compilation when `setPointOfInstantiation` is called with an invalid location.
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