Compiler freezes on Debian 10 (buster) with GCC 8.3.0

[Ben1138]

Environment

OS: Debian 10 (buster)
Processor Arch: ARM
Compiler: GCC 8.3.0
CMake: 3.13.4

When trying to build my CMake project, as soon as GCC compiles my (only) compilation unit that #include "httplib.h", I get these warnings:

and GCC just freezes and is unresponsive forever.
On Windows x64 with MSVC, it builds just fine.
I don't know whether this is an issue within httplib or the GCC compiler itself.

[yhirose]

@Ben1138 thanks for the report.

@bgs99 @bugdea1er, it seems like it is caused by #1608 at the following line. Could you please take a look at it? Thanks!

[bgs99]

I've reproduced the warning locally on docker with Debian 10 + GCC 8.3 when compiling the examples, but no compiler freezes.
The warning is valid and can be fixed by replacing this line with

request.matches = std::smatch();

@Ben1138 , could you check if it helps with the freeze? Otherwise I will probably need the minimal reproducible example.

[yhirose]

@Ben1138 please let me and @bgs99 know if it still happens.

[Ben1138]

The warning is gone, but it still freezes.
Here's a minimal example with which I can reproduce the freeze: freeze.zip

If someone can confirm or confute the freeze in the same environment, that'd be great.

[bgs99]

Checked on Docker x64 Debian 10 + GCC 8.3, it takes a couple of seconds but builds fine, if I add the missing linking to pthread in CMakeLists.txt.

[bgs99]

Checked on Docker ARM too, no freezes either.