https://bugs.llvm.org/show_bug.cgi?id=39977
Bug ID: 39977
Summary: Constant folding incorrectly folds modifiable compound
literal
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Keywords: miscompilation
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: hst...@ca.ibm.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
In the following, Clang appears to ignore the modification of the array
element; this, in turn, leads to a call to `abort()`. The GCC-built executable
returns 0 as expected.
### SOURCE (<stdin>):
extern "C" void abort(void);
constexpr int *p0 = (int []){ 13 };
int main(void) {
*p0 = 42;
int x[*p0];
if ((sizeof x)/sizeof(int) == 42) return 0;
abort();
}
### COMPILER INVOCATION:
clang++ -xc++ -std=gnu++11 -o testit -
### INVOCATION OF RESULTING EXECUTABLE:
./testit
### ACTUAL EXECUTION OUTPUT:
Aborted
Return: 0x86:134
### EXPECTED EXECUTION OUTPUT:
Return: 0x00:0
### COMPILER VERSION INFO (clang++ -v):
clang version 8.0.0 (trunk)
Target: powerpc64le-unknown-linux-gnu
Thread model: posix
InstalledDir:
/gsa/tlbgsa/projects/x/xlcmpbld/run/clang/main_trunk/linux_leppc/daily/latest/bin
Found candidate GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.2
Found candidate GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.5
Selected GCC installation: /usr/lib/gcc/ppc64le-redhat-linux/4.8.5
Candidate multilib: .;@m64
Selected multilib: .;@m64
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