[llvm-bugs] [Bug 25045] New: clang 3.5.2 on cygwin generates inconsistent argc value on -O1 and higher
via llvm-bugs
llvm-bugs at lists.llvm.org
Sun Oct 4 11:52:06 PDT 2015
https://llvm.org/bugs/show_bug.cgi?id=25045
Bug ID: 25045
Summary: clang 3.5.2 on cygwin generates inconsistent argc
value on -O1 and higher
Product: new-bugs
Version: 3.5
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: new bugs
Assignee: unassignedbugs at nondot.org
Reporter: omoik4ne at yahoo.com
CC: llvm-bugs at lists.llvm.org
Classification: Unclassified
Created attachment 14996
--> https://llvm.org/bugs/attachment.cgi?id=14996&action=edit
Trivial C code to print value of argc
On cygwin, when compiling C or C++ code with optimizations enabled using either
clang or clang++, the value of argc passed to main() is inconsistent.
cat <<EOT > a.c
#include<stdio.h>
int main(int argc, char *argv[])
{
printf("%d\n", argc);
return 0;
}
EOT
% clang -O0 a.c -o a.exe && ./a.exe
1
% clang -O1 a.c -o a.exe && ./a.exe
0
A value of "0" is not technically wrong (according to 5.1.2.2.1 in ISO/IEC
9899), but I can't find another compiler that does this. If clang were going
to do it, it should at least be consistent between -O0 and -O1.
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