Patch lets it build on xenial for me, thank you.

Patch for this bug is available here, "attachment-0001.bin": https://lists.gnupg.org/pipermail/gcrypt-devel/2021-January/005079.html

I committed the partial result docker container, so I can restart it for investigation. So:

I tested xenial with gcc-5.3 (xenial distro repo) and gcc-5.4 (xenial-updates distro repo) and libgcrypt 1.9.0 from git repo and from tarball. I did not get any errors.

See T5267: Ed25519 backward compatible private key support for preceding ZERO(s) for the fix.

https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man2/posix_spawn.2.html dated August 9, 2007.
So, I guess that posix_spawn became available in MacOS X Leopard (10.5).

Also support older MacOS X, which has no posix_spawn.

Thanks @aheinecke for fixing my fix with 2859edd! Closing here.

In T5264#142204, @jukivili wrote:

I also needed this patch:

0001-global-fix-compile-error-at-pragma-GCC-diagnostic.patch2 KBDownload

I am going to check whether I need it on Tiger!

In T5264#142204, @jukivili wrote:

I tested building on Ubuntu 8.04 (gcc-4.2) and got same error about cipher_bulk_ops_t. Applying patch fixed that problem.

I see now my mistake: I also have to re-write line #132 which I did not see yet!

With your other patch I still get:

libtool: compile:  /opt/local/bin/gcc-apple-4.2 -DHAVE_CONFIG_H -I. -I.. -I../src -I../src -I../mpi -I../mpi -I/opt/local/include -I/opt/local/include -pipe -Os -std=gnu89 -arch ppc -fno-delete-null-pointer-checks -Wall -MT cipher.lo -MD -MP -MF .deps/cipher.Tpo -c cipher.c  -fno-common -DPIC -o .libs/cipher.o
In file included from cipher.c:31:
./cipher-internal.h:145: error: redefinition of typedef 'cipher_bulk_ops_t'
../src/cipher-proto.h:132: error: previous declaration of 'cipher_bulk_ops_t' was here

In T5264#142203, @jukivili wrote:

Thanks for testing. However, I do not believe patch has been correctly applied.

The "Portfile" that conducts the build process has the patch contained, I sent you the list of files being patched, and here is the end of my translated patch set:

I tested building on Ubuntu 8.04 (gcc-4.2) and got same error about cipher_bulk_ops_t. Applying patch fixed that problem.

Thanks for testing. However, I do not believe patch has been correctly applied.

In T5264#142094, @jukivili wrote:

Here's patch to try out:

0001-cipher-proto-remove-forward-typedef-of-cipher_bulk_o.patch6 KBDownload

T4702 is our release info task for 2.3.0

You should have received mail with additional log levels now

In T5264#142064, @jukivili wrote:

In "src/cipher-proto.h", try removing typedef and leaving just forward declaration of structure.

Performing only this change leads consistently to the well-known error of:

In T5264#142059, @werner wrote:

Do not use -fno-common

The translated bulk patch fails. Compilation still runs into this error:

In T5264#142094, @jukivili wrote:

Here's patch to try out:

0001-cipher-proto-remove-forward-typedef-of-cipher_bulk_o.patch6 KBDownload

@gniibe Hi! Can you estimate, when this feature will be released?
I have not found this patch in the latest GnuPG release tags (in the Git repository) either by the name or the commit hash.

Thanks for the report. Some time ago I wrote the code in a way that when setting the HTML body failed it would fallback to the plain body, regardless of the preferences:
So even though there is an error that error is handled. https://dev.gnupg.org/source/gpgol/browse/master/src/mail.cpp;4d57033a095aecf8529606428efef6af466f1196$1488

Alright!

@ballapete when you have time, could you also test https://dev.gnupg.org/T5268#142155 on Tiger?

Right now I am compiling with my old PowerBook in Tiger. In case a compilation fails I'll try this patch – on Tiger (Mac OS X 10.4.11)! It's a bit more primitive than Leopard.

Here's patch to try out:

BTW, we should better get back to the classic/GNU-coding-style pattern:

In "src/cipher-proto.h", try removing typedef and leaving just forward declaration of structure.

Do not use -fno-common

Does attached patch help?

There’s a patch to restore support for Qt4: D521.

My bad, prior to the release I tested only against Qt5.

I tried it - that doesn't help. Same error message.

Thanks for the report. As you noticed, issue had been reported already.

That might be helpful. But, on the other hand, if I had just googled the problem I was seeing I would have gotten answer quite fast.

Problem is in GET_DATA_POINTER macro. MacOS assembler expects data references in some different format than Linux. Could you try following edit and see if libgcrypt then compiles? In cipher/asm-common-aarch64.h, there is definition of GET_DATA_POINTER macro:

#ifdef _WIN32
#define GET_DATA_POINTER(reg, name) \
	adrp    reg, name ; \
	add     reg, reg, #:lo12:name ;
#else
#define GET_DATA_POINTER(reg, name) \
	adrp    reg, :got:name ; \
	ldr     reg, [reg, #:got_lo12:name] ;
#endif

I have now tried to build libgcrypt 1.9.0 for arm64 using clang. I get the following error:

It seems that this issue has already been reported with a better fix: https://lists.gnupg.org/pipermail/gcrypt-devel/2021-January/005060.html
Feel free to close this issue.