bug: comparison of integer expressions of different signedness on aarch64

Did you check existing issues?

• I have read all the tree-sitter docs if it relates to using the parser
• I have searched the existing issues of tree-sitter-cpp

Tree-Sitter CLI Version, if relevant (output of tree-sitter --version)

0.23.4

Describe the bug

While building cvise which imported tree-sitter-cpp 0.23.4, we get the following error when building for openSUSE Tumbleweed aarch64:

[   29s] [ 15%] Building C object tree-sitter-cpp/CMakeFiles/tree-sitter-cpp.dir/src/scanner.c.o
[   29s] cd /home/abuild/rpmbuild/BUILD/cvise-2.12.0+git.20251010.334b9acf-build/cvise-2.12.0+git.20251010.334b9acf/build/tree-sitter-cpp && /usr/bin/cc -DHAVE_CONFIG_H -I/home/abuild/rpmbuild/BUILD/cvise-2.12.0+git.20251010.334b9acf-build/cvise-2.12.0+git.20251010.334b9acf/tree-sitter-cpp/src -mbranch-protection=standard -O2 -Wall -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3 -fstack-protector-strong -funwind-tables -fasynchronous-unwind-tables -fstack-clash-protection -Werror=return-type -flto=auto -g -fuse-ld=mold -Wall -Wextra -Werror -Wno-unused-parameter -Wno-error=maybe-uninitialized -Wno-error=class-memaccess -Wno-error=non-template-friend -Wno-error=deprecated-declarations -O2 -g -DNDEBUG -std=gnu11 -fPIC -MD -MT tree-sitter-cpp/CMakeFiles/tree-sitter-cpp.dir/src/scanner.c.o -MF CMakeFiles/tree-sitter-cpp.dir/src/scanner.c.o.d -o CMakeFiles/tree-sitter-cpp.dir/src/scanner.c.o -c /home/abuild/rpmbuild/BUILD/cvise-2.12.0+git.20251010.334b9acf-build/cvise-2.12.0+git.20251010.334b9acf/tree-sitter-cpp/src/scanner.c
[   29s] /home/abuild/rpmbuild/BUILD/cvise-2.12.0+git.20251010.334b9acf-build/cvise-2.12.0+git.20251010.334b9acf/tree-sitter-cpp/src/scanner.c: In function ‘scan_raw_string_delimiter’:
[   29s] /home/abuild/rpmbuild/BUILD/cvise-2.12.0+git.20251010.334b9acf-build/cvise-2.12.0+git.20251010.334b9acf/tree-sitter-cpp/src/scanner.c:32:34: error: comparison of integer expressions of different signedness: ‘int32_t’ {aka ‘int’} and ‘wchar_t’ {aka ‘unsigned int’} [-Werror=sign-compare]
[   29s]    32 |             if (lexer->lookahead != scanner->delimiter[i]) {
[   29s]       |                                  ^~
[   29s] /home/abuild/rpmbuild/BUILD/cvise-2.12.0+git.20251010.334b9acf-build/cvise-2.12.0+git.20251010.334b9acf/tree-sitter-cpp/src/scanner.c: In function ‘scan_raw_string_content’:
[   29s] /home/abuild/rpmbuild/BUILD/cvise-2.12.0+git.20251010.334b9acf-build/cvise-2.12.0+git.20251010.334b9acf/tree-sitter-cpp/src/scanner.c:78:38: error: comparison of integer expressions of different signedness: ‘int32_t’ {aka ‘int’} and ‘wchar_t’ {aka ‘unsigned int’} [-Werror=sign-compare]
[   29s]    78 |                 if (lexer->lookahead == scanner->delimiter[delimiter_index]) {
[   29s]       |                                      ^~
[   29s] cc1: all warnings being treated as errors
[   29s] make[2]: *** [tree-sitter-cpp/CMakeFiles/tree-sitter-cpp.dir/build.make:100: tree-sitter-cpp/CMakeFiles/tree-sitter-cpp.dir/src/scanner.c.o] Error 1

Steps To Reproduce/Bad Parse Tree

Build for aarch64 with -Werror=sign-compare

Expected Behavior/Parse Tree

It should build fine.

Repro

// Example code that causes the issue
void foo() {
  // Code that fails to parse, or causes an error
}

Start with src/scanner.c, especially scan_raw_string_delimiter and scan_raw_string_content, where the reported signedness comparisons occur. Reproduce the build on aarch64 or with -Werror=sign-compare, then verify that tree-sitter-cpp builds successfully with those warnings treated as errors.