Fix: fall back to "C" locale when system lacks user's LANG

std::locale("") at static-init throws std::runtime_error on systems
where the requested locale (e.g. en_US.UTF-8) isn't generated, killing
Fluorine before main() runs. Wrap in try/catch and fall back to the
classic locale.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/src/src/shared/util.cpp b/src/src/shared/util.cpp
index ec720d2..71e735e 100644
--- a/src/src/shared/util.cpp
+++ b/src/src/shared/util.cpp
@@ -129,7 +129,19 @@ std::wstring ToWString(const std::string& source, bool utf8)
 }

 #endif

 

-static std::locale loc("");

+static std::locale makeUserLocale()

+{

+  // std::locale("") reads LANG/LC_* env vars. If user's system lacks the

+  // requested locale (e.g. en_US.UTF-8 not generated), constructor throws

+  // runtime_error. Fall back to "C" so startup doesn't abort.

+  try {

+    return std::locale("");

+  } catch (const std::runtime_error&) {

+    return std::locale::classic();

+  }

+}

+

+static std::locale loc = makeUserLocale();

 static auto locToLowerW = [](wchar_t in) -> wchar_t {

   return std::tolower(in, loc);

 };