amd64->armv7 cross build: devel/llvm90 build blocked by math/z3 build failure: can't create dynamic relocation R_ARM_MOVW_ABS_NC against symbol: __stack_chk_guard in readonly segment

[Mark Millard]

On 2019-Aug-5, at 14:48, Mark Millard <marklmi at yahoo.com> wrote:

[Note: Targeting aarch64 instead did not have this problem.]
> 
> [00:03:02] [02] [00:00:00] Building math/z3 | z3-4.8.5_1
> . . .
> [00:06:31] [02] [00:03:29] Saved math/z3 | z3-4.8.5_1 wrkdir to: /usr/local/poudriere/data/wrkdirs/FBSDFSSDjailArmV7-default/default/z3-4.8.5_1.tar
> [00:06:31] [02] [00:03:29] Finished math/z3 | z3-4.8.5_1: Failed: build
> . . .
> [00:06:35] [02] [00:03:33] Skipping devel/llvm90 | llvm90-9.0.0.r1: Dependent port math/z3 | z3-4.8.5_1 failed
> 
> The specific first errors for math/z3 were:
> 
> ld: error: can't create dynamic relocation R_ARM_MOVW_ABS_NC against symbol: __stack_chk_guard in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations 
> in the output
>>>> defined in /lib/libc.so.7
>>>> referenced by install_tactic.cpp:97 (../src/api/dll/install_tactic.cpp:97)
>>>>             api/dll/install_tactic.o:(install_tactics(tactic_manager&))
> 
> ld: error: can't create dynamic relocation R_ARM_MOVT_ABS against symbol: __stack_chk_guard in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>>> defined in /lib/libc.so.7
>>>> referenced by install_tactic.cpp:97 (../src/api/dll/install_tactic.cpp:97)
>>>>             api/dll/install_tactic.o:(install_tactics(tactic_manager&))
> 
> ld: error: can't create dynamic relocation R_ARM_MOVW_ABS_NC against symbol: .L.str in readonly segment; recompile object files with -fPIC or pass '-Wl,-z,notext' to allow text relocations in the output
>>>> defined in api/dll/install_tactic.o
>>>> referenced by install_tactic.cpp:98 (../src/api/dll/install_tactic.cpp:98)
>>>>             api/dll/install_tactic.o:(install_tactics(tactic_manager&))
> 
> 
> Is the default:
> 
> STATIC=on: Build static z3 library
> 
> inappropriate for armv7?
> 

Even with:

. . . -Wl,-znotext -Wl,-soname,libz3.so.0

via:

# svnlite diff /usr/ports/math/z3
Index: /usr/ports/math/z3/Makefile
===================================================================
--- /usr/ports/math/z3/Makefile	(revision 508197)
+++ /usr/ports/math/z3/Makefile	(working copy)
@@ -36,6 +36,7 @@
 GMP_LIB_DEPENDS=	libgmp.so:math/gmp
 
 LDFLAGS_i386=		-Wl,-znotext
+LDFLAGS_armv7=		-Wl,-znotext
 BUILD_WRKSRC=		${WRKSRC}/build
 INSTALL_WRKSRC=		${WRKSRC}/build
 

I get some of the errors:

ld: error: relocation R_ARM_MOVW_ABS_NC cannot be used against symbol __stack_chk_guard; recompile with -fPIC
>>> defined in /lib/libc.so.7
>>> referenced by install_tactic.cpp:97 (../src/api/dll/install_tactic.cpp:97)
>>>               api/dll/install_tactic.o:(install_tactics(tactic_manager&))
. . .
ld: error: relocation R_ARM_MOVT_ABS cannot be used against symbol __stack_chk_guard; recompile with -fPIC
>>> defined in /lib/libc.so.7
>>> referenced by gparams_register_modules.cpp:93 (../src/api/dll/gparams_register_modules.cpp:93)
>>>               api/dll/gparams_register_modules.o:(gparams_register_modules())
ld: error: relocation R_ARM_MOVW_ABS_NC cannot be used against symbol g_z3_log_enabled; recompile with -fPIC
>>> defined in api/api_log.o
>>> referenced by api_log_macros.h:11 (../src/api/api_log_macros.h:11)
>>>               api/api_algebraic.o:(Z3_algebraic_is_value)
. . .

Currently building llvm90 on/for armv7 is blocked by needing
to build math/z3 first.

(For FreeBSD to switch from clang 8 to clang 9 as the system
compiler might require adding z3 to FreeBSD?)

===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)