docs: Mention lint-locale-dependence.sh in developer-notes.md

Author: practicalswift

doc/developer-notes.md

@@ -499,7 +499,35 @@ Strings and formatting
 
 - Use `ParseInt32`, `ParseInt64`, `ParseUInt32`, `ParseUInt64`, `ParseDouble` from `utilstrencodings.h` for number parsing
 
-  - *Rationale*: These functions do overflow checking, and avoid pesky locale issues
+  - *Rationale*: These functions do overflow checking, and avoid pesky locale issues.
+
+- Avoid using locale dependent functions if possible. You can use the provided
+  [`lint-locale-dependence.sh`](/contrib/devtools/lint-locale-dependence.sh)
+  to check for accidental use of locale dependent functions.
+
+  - *Rationale*: Unnecessary locale dependence can cause bugs that are very tricky to isolate and fix.
+
+  - These functions are known to be locale dependent:
+    `alphasort`, `asctime`, `asprintf`, `atof`, `atoi`, `atol`, `atoll`, `atoq`,
+    `btowc`, `ctime`, `dprintf`, `fgetwc`, `fgetws`, `fprintf`, `fputwc`,
+    `fputws`, `fscanf`, `fwprintf`, `getdate`, `getwc`, `getwchar`, `isalnum`,
+    `isalpha`, `isblank`, `iscntrl`, `isdigit`, `isgraph`, `islower`, `isprint`,
+    `ispunct`, `isspace`, `isupper`, `iswalnum`, `iswalpha`, `iswblank`,
+    `iswcntrl`, `iswctype`, `iswdigit`, `iswgraph`, `iswlower`, `iswprint`,
+    `iswpunct`, `iswspace`, `iswupper`, `iswxdigit`, `isxdigit`, `mblen`,
+    `mbrlen`, `mbrtowc`, `mbsinit`, `mbsnrtowcs`, `mbsrtowcs`, `mbstowcs`,
+    `mbtowc`, `mktime`, `putwc`, `putwchar`, `scanf`, `snprintf`, `sprintf`,
+    `sscanf`, `stoi`, `stol`, `stoll`, `strcasecmp`, `strcasestr`, `strcoll`,
+    `strfmon`, `strftime`, `strncasecmp`, `strptime`, `strtod`, `strtof`,
+    `strtoimax`, `strtol`, `strtold`, `strtoll`, `strtoq`, `strtoul`,
+    `strtoull`, `strtoumax`, `strtouq`, `strxfrm`, `swprintf`, `tolower`,
+    `toupper`, `towctrans`, `towlower`, `towupper`, `ungetwc`, `vasprintf`,
+    `vdprintf`, `versionsort`, `vfprintf`, `vfscanf`, `vfwprintf`, `vprintf`,
+    `vscanf`, `vsnprintf`, `vsprintf`, `vsscanf`, `vswprintf`, `vwprintf`,
+    `wcrtomb`, `wcscasecmp`, `wcscoll`, `wcsftime`, `wcsncasecmp`, `wcsnrtombs`,
+    `wcsrtombs`, `wcstod`, `wcstof`, `wcstoimax`, `wcstol`, `wcstold`,
+    `wcstoll`, `wcstombs`, `wcstoul`, `wcstoull`, `wcstoumax`, `wcswidth`,
+    `wcsxfrm`, `wctob`, `wctomb`, `wctrans`, `wctype`, `wcwidth`, `wprintf`
 
 - For `strprintf`, `LogPrint`, `LogPrintf` formatting characters don't need size specifiers