libgcrypt: FTBFS with LTO
Closed, ResolvedPublic


Architecture: AMD64 (x86_64)
GCC version: 6.2.0 20160822 (AOSC OS, Core) (GCC)
LD (gold version): 2.27 (1.12)

When LTO is enabled in CFLAGS and LDFLAGS (-flto=jobserver -fuse-linker-plugins
to GCC and LD, respectively), libgcrypt refuses to build with an inlining error.

libtool: compile: gcc -DHAVE_CONFIG_H -I.
-I/var/lib/abbs/build/tmp.FrJpnZY70I/libgcrypt-1.7.5/cipher -I.. -I../src
-I/var/lib/abbs/build/tmp.FrJpnZY70I/libgcrypt-1.7.5/src -D_FORTIFY_SOURCE=2
-Wa,--noexecstack -pipe -Wno-error -fstack-protector-strong
--param=ssp-buffer-size=4 -fomit-frame-pointer -O2 -march=x86-64 -mtune=core2
-msse -msse2 -msse3 -fira-loop-pressure -fira-hoist-pressure -ftree-vectorize
-specs=/usr/lib/autobuild3/specs/hardened-cc1 -flto=jobserver -MT
camellia-aesni-avx-amd64.lo -MD -MP -MF .deps/camellia-aesni-avx-amd64.Tpo -c
-fPIC -DPIC -o .libs/camellia-aesni-avx-amd64.o
In file included from /usr/include/features.h:368:0,

from /usr/include/stdio.h:27,

/var/lib/abbs/build/tmp.FrJpnZY70I/libgcrypt-1.7.5/cipher/rijndael-ssse3-amd64.c: In
function '_gcry_aes_ssse3_do_setkey':
/usr/include/bits/string3.h:50:1: error: inlining failed in call to
always_inline 'memcpy': target specific option mismatch
NTH (memcpy (void *restrict dest, const void *restrict __src,
note: called from here

memcpy(&ctx->keyschdec32[0][0], key, keybits / 8);

mv -f .deps/camellia-aesni-avx2-amd64.Tpo .deps/camellia-aesni-avx2-amd64.Plo
mv -f .deps/camellia-aesni-avx-amd64.Tpo .deps/camellia-aesni-avx-amd64.Plo
make[1]: * [Makefile:660: rijndael-ssse3-amd64.lo] Error 1
* Waiting for unfinished jobs....
mv -f .deps/rfc2268.Tpo .deps/rfc2268.Plo
mv -f .deps/idea.Tpo .deps/idea.Plo
mv -f .deps/salsa20.Tpo .deps/salsa20.Plo
mv -f .deps/camellia-glue.Tpo .deps/camellia-glue.Plo
mv -f .deps/camellia.Tpo .deps/camellia.Plo
mv -f .deps/seed.Tpo .deps/seed.Plo
make[1]: Leaving directory
make: *** [Makefile:477: install-recursive] Error 1


JeffBai set Version to 1.7.5.
JeffBai added a subscriber: JeffBai.
werner added a subscriber: werner.Dec 20 2016, 11:35 PM

Jussi: would you be so kind and look at this problem?

The configure option --disable-asm might help.

werner assigned this task to jukivili.Dec 20 2016, 11:35 PM
werner added a subscriber: jukivili.

werner: Well... Doesn't it destroy libgcrypt's performance?

Attached patch should solve LTO problems with rinjdael-ssse-amd64.c.

'memcpy' problem seems to be because of bad interaction between -flto and
#pragma "no-sse". Strangely switching memcpy to buf_cpy solved problem, even
through buf_cpy itself just uses memcpy (on x86).

With this issue solved, I ran in to problem with rijndael-ssse3 assembly code
blocks going missing with -flto and link failing. So rest of the changes in
patch are for fixing lto visibility of assembly.

werner closed this task as Resolved.Jan 18 2017, 11:59 AM
werner added a project: Unreleased.

The patch has been applied to master and the 1.7 branch. A 1.7.6 will be
released soon.

werner added a project: Testing.
werner reopened this task as Open.

There have been some problems backporting the batch to 1.7 thus it will not go
into 1.7.6.

werner closed this task as Resolved.
werner added a project: Unreleased.