https://llvm.org/bugs/show_bug.cgi?id=28998
Bug ID: 28998
Summary: wrong comment parsing with regex
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++14
Assignee: unassignedclangb...@nondot.org
Reporter: bremend...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
The compiler misinterprets/ignores the commented out block (see **** lines) and
produces error messages: (C++14 and C++17)
#include <iostream>
#include <regex>
#include <string>
int main() {
std::string astring("// x /* meaningless comment start ");
/* comment results in errors ****
std::string result = std::regex_replace(
astring, std::regex("//[^\n]*/\\*"), "ZZ ");
std::cout << "result = " << result << '\n';
// expected: ZZ meaningless comment start
*/ // end of comment ****
std::cout << "astring = " << astring << '\n';
}
If you delete completely the ****-marked lines, the program compiles and gives
the expected result. clang++ -v gives:
clang version 4.0.0 (trunk 278673)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
Found candidate GCC installation: /usr/lib64/gcc/x86_64-suse-linux/4.8
Found candidate GCC installation:
/usr/local/bin/../lib/gcc/x86_64-pc-linux-gnu/6.1.0
Found candidate GCC installation:
/usr/local/bin/../lib64/gcc/x86_64-pc-linux-gnu/6.1.0
Selected GCC installation:
/usr/local/bin/../lib64/gcc/x86_64-pc-linux-gnu/6.1.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
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