From: Jonathan Wakely <jwakely@redhat.com>
To: Vladimir V <vv.os.swe@gmail.com>
Cc: libstdc++@gcc.gnu.org
Subject: Re: Problem building libstdc++ for the avr target
Date: Thu, 25 Mar 2021 12:36:03 +0000 [thread overview]
Message-ID: <20210325123603.GN3008@redhat.com> (raw)
In-Reply-To: <CA+=iAipaM6VQWBH3gWsrAjy=hB8ss_ZpRyWjPge2SJ7bxmEEOQ@mail.gmail.com>
On 25/03/21 10:27 +0100, Vladimir V wrote:
>Hello.
>
>Recently I tried the 'freestanding' build of the libstdc++ for the avr to
>verify that my fixes were sufficient for it as well.
>Unfortunately, I encountered the following error:
>../../../../libstdc++-v3/libsupc++/new_opa.cc: In function 'void*
>__gnu_cxx::aligned_alloc(std::size_t, std::size_t)':
>../../../../libstdc++-v3/libsupc++/new_opa.cc:97:28: error: 'malloc' was
>not declared in this scope
> 97 | void* const malloc_ptr = malloc(sz + al);
>
>My investigation showed that in the chain of includes the stdlib.h of the
>avr-libc is not present.
>It looks like includes are resolved in the following way (here are the
>original paths as they are linked from out folders during build):
>new_opa.cc -> libstdc++-v3/include/c_compatibility/stdlib.h ->
>libstdc++-v3/include/c_global/cstdlib
>In cstdlib, for non-hosted builds stdlib.h is not included.
>
>This problem is not present if the non-hosted build is done with
>'with-newlib' flag instead of 'with-avrlibc' (common workaround as the
>avrlibc build was fixed only recently).
>Might it be that some include order depends on the target libc? Or maybe
>some implicit conditions are involved?
>
>Could you please support me with this issue?
I think this is needed:
--- a/libstdc++-v3/libsupc++/new_opa.cc
+++ b/libstdc++-v3/libsupc++/new_opa.cc
@@ -54,6 +54,10 @@ extern "C"
void *posix_memalign(void **, size_t alignment, size_t size);
# elif _GLIBCXX_HAVE_MEMALIGN
void *memalign(size_t alignment, size_t size);
+#else
+ // A freestanding C runtime may not provide "malloc" -- but there is no
+ // other reasonable way to implement "operator new".
+ void *malloc (std::size_t); with GCC 7.5
# endif
}
#endif
next prev parent reply other threads:[~2021-03-25 12:36 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-07 17:32 Vladimir V
2020-12-07 20:30 ` Jonathan Wakely
2020-12-07 20:32 ` Jonathan Wakely
2020-12-09 0:28 ` Vladimir V
2020-12-09 12:32 ` Vladimir V
2020-12-09 12:49 ` Jonathan Wakely
2020-12-09 17:01 ` Jonathan Wakely
2020-12-09 23:00 ` Vladimir V
2020-12-10 17:39 ` Vladimir V
2020-12-10 20:15 ` Jonathan Wakely
2020-12-10 20:31 ` Vladimir V
2020-12-15 11:48 ` Jonathan Wakely
2020-12-16 7:33 ` Vladimir V
2020-12-07 20:41 ` Keith Packard
2020-12-07 21:06 ` Jonathan Wakely
2021-01-04 11:28 ` Vladimir V
2021-01-08 18:21 ` Jonathan Wakely
2021-01-22 14:46 ` Vladimir V
2021-02-07 13:55 ` Vladimir V
2021-02-07 18:22 ` Vladimir V
2021-02-07 18:23 ` Keith Packard
2021-02-07 22:33 ` Vladimir V
2021-02-07 23:06 ` Keith Packard
2021-02-08 12:58 ` Vladimir V
2021-02-08 17:38 ` Jonathan Wakely
2021-02-08 17:45 ` Jonathan Wakely
2021-02-08 17:47 ` Jonathan Wakely
2021-02-08 22:25 ` Vladimir V
2021-02-09 10:47 ` Jonathan Wakely
2021-02-09 10:54 ` Vladimir V
2021-03-25 9:27 ` Vladimir V
2021-03-25 12:36 ` Jonathan Wakely [this message]
2021-03-25 18:27 ` Jonathan Wakely
2021-03-25 21:37 ` Vladimir V
2021-03-25 23:02 ` Jonathan Wakely
2021-03-26 8:25 ` Vladimir V
2020-12-07 21:51 ` Vladimir V
2020-12-07 23:00 ` Keith Packard
2020-12-08 8:12 ` Vladimir V
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