[PATCH 1/1] tools/nolibc/string: export strlen()

From: Rodrigo Campos
Date: Fri Jan 26 2024 - 09:27:13 EST


As with commit 8d304a374023, "tools/nolibc/string: export memset() and
memmove()", gcc -Os without -ffreestanding may fail to compile with:

cc -fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib -lgcc -c test.c -o test.o
cc test.o -fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib -lgcc -static -o test
/usr/bin/ld: test.o: in function `main':
test.c:(.text.startup+0x32): undefined reference to `strlen'
collect2: error: ld returned 1 exit status

As on the aforementioned commit, this patch adds a section to export
this function so compilation works on those cases too.

Signed-off-by: Rodrigo Campos <rodrigo@xxxxxxxxxxx>
---
tools/include/nolibc/string.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/include/nolibc/string.h b/tools/include/nolibc/string.h
index a01c69dd495f..ed15c22b1b2a 100644
--- a/tools/include/nolibc/string.h
+++ b/tools/include/nolibc/string.h
@@ -123,7 +123,7 @@ char *strcpy(char *dst, const char *src)
* thus itself, hence the asm() statement below that's meant to disable this
* confusing practice.
*/
-static __attribute__((unused))
+__attribute__((weak,unused,section(".text.nolibc_strlen")))
size_t strlen(const char *str)
{
size_t len;
--
2.43.0