libc: make putc_r implementation weak

igrr · igrr · commit 97d08065f9ee · 2018-08-20T17:11:29.000+08:00
newlib provides its own implementation of _putc_r, which will call _write_r (possibly after buffering). Make our implementation weak to allow using the one from newlib. Fixes #4630
diff --git a/cores/esp8266/libc_replacements.c b/cores/esp8266/libc_replacements.c
@@ -93,6 +93,8 @@ int ICACHE_RAM_ATTR _write_r(struct _reent* r, int file, char *ptr, int len) {
     return len;
 }
 
+int ICACHE_RAM_ATTR _putc_r(struct _reent* r, int c, FILE* file) __attribute__((weak));
+
 int ICACHE_RAM_ATTR _putc_r(struct _reent* r, int c, FILE* file) {
     (void) r;
     if (file->_file == STDOUT_FILENO) {

Original file line number	Diff line number	Diff line change
`@@ -93,6 +93,8 @@ int ICACHE_RAM_ATTR _write_r(struct _reent* r, int file, char *ptr, int len) {`
`93`	`93`	`return len;`
`94`	`94`	`}`
`95`	`95`
	`96`	`+int ICACHE_RAM_ATTR _putc_r(struct _reent* r, int c, FILE* file) __attribute__((weak));`
	`97`	`+`
`96`	`98`	`int ICACHE_RAM_ATTR _putc_r(struct _reent* r, int c, FILE* file) {`
`97`	`99`	`(void) r;`
`98`	`100`	`if (file->_file == STDOUT_FILENO) {`