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Date: Tue, 12 Apr 2022 03:06:08 +0200
From: Wolf <wolf@...fsden.cz>
To: musl@...ts.openwall.com
Subject: Problem with strdupa in C++ code
Hello,
I'm trying to compile C++ project in Alpine (so with musl) and I'm
hitting following error:
In file included from /usr/include/fortify/string.h:22,
from src/main/tools/linux-sandbox-pid1.cc:34:
src/main/tools/linux-sandbox-pid1.cc: In function 'int CreateTarget(const char*, bool)':
src/main/tools/linux-sandbox-pid1.cc:149:28: error: invalid conversion from 'void*' to 'char*' [-fpermissive]
149 | if (CreateTarget(dirname(strdupa(path)), true) < 0) {
| ^
| |
| void*
In file included from /usr/include/fortify/string.h:22,
from src/main/tools/linux-sandbox-pid1.cc:34:
/usr/include/string.h:31:15: note: initializing argument 1 of 'char* strcpy(char*, const char*)'
31 | char *strcpy (char *__restrict, const char *__restrict);
| ^~~~~~~~~~~~~~~~
If my reading for musl's code is correct, this is actually a bug in the
header file, since the declarations are:
void *alloca(size_t);
#define strdupa(x) strcpy(alloca(strlen(x)+1),x)
As far as I know, there is no automatic conversion from void* to char*
in C++. Should this be fixed by turning the define into
#define strdupa(x) strcpy((char*)alloca(strlen(x)+1),x)
? I think that should be both valid C and C++.
Best regards,
Tomas Volf
--
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.
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