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package/z3: introduce _ARCH_SUPPORTS

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z3 package was initially added with a depends on !BR2_nios2. This was
detected by testing with "./utils/test-pkg -a -p z3". It turned out that
few other architectures are also not supported. The actual z3
requirement is to have a libc that provides <fenv.h> AND also provides
all the four macros: FE_DOWNWARD, FE_TONEAREST, FE_TOWARDZERO,
FE_UPWARD.

Quoting glibc manual, or "man fenv":
https://www.gnu.org/software/libc/manual/html_node/Rounding.html

"fenv.h defines constants which you can use to refer to the various
rounding modes. Each one will be defined if and only if the FPU
supports the corresponding rounding mode."

This patch introduces _ARCH_SUPPORTS to limit only to the architectures
with a FPU that has those rounding modes.

Fixes:
- http://autobuild.buildroot.net/results/2809dd1ae2f3ada8ee7b3f3e388341c7cfb633fb

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
This commit is contained in:
Julien Olivain 2022-12-07 00:10:34 +01:00 committed by Yann E. MORIN
parent bca2c28fc9
commit 415c7af079
1 changed files with 24 additions and 2 deletions
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26
package/z3/Config.in
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@ -1,11 +1,33 @@
# z3 supports arch for which libc fenv.h provides all four macros:
# FE_DOWNWARD, FE_TONEAREST, FE_TOWARDZERO, FE_UPWARD
# See for example in glibc https://sourceware.org/git/glibc.git
# git grep -E '^[[:space:]]*#[[:space:]]*define[[:space:]]+FE_(TONEAREST|UPWARD|DOWNWARD|TOWARDZERO)' sysdeps/
config BR2_PACKAGE_Z3_ARCH_SUPPORTS
bool
default y if BR2_aarch64 || BR2_aarch64_be
default y if BR2_arceb || BR2_arcle
default y if BR2_arm || BR2_armeb
default y if BR2_i386
default y if BR2_m68k
# BR2_microblaze has only FE_TONEAREST
default y if BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el
# BR2_nios2 has only FE_TONEAREST
default y if BR2_or1k
default y if BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le
default y if BR2_riscv
default y if BR2_s390x
# BR2_sh has only FE_{TONEAREST,TOWARDZERO}
default y if BR2_sparc || BR2_sparc64
default y if BR2_x86_64
# BR2_xtensa supports only uclibc which does not have fenv.h
config BR2_PACKAGE_Z3
bool "z3"
depends on BR2_INSTALL_LIBSTDCPP
depends on BR2_TOOLCHAIN_GCC_AT_LEAST_7 # c++17
# z3 needs fenv.h which is not provided by uclibc
depends on !BR2_TOOLCHAIN_USES_UCLIBC
# fenv.h lacks FE_INVALID, FE_OVERFLOW & FE_UNDERFLOW on nios2
depends on !BR2_nios2
depends on BR2_PACKAGE_Z3_ARCH_SUPPORTS
help
Z3, also known as the Z3 Theorem Prover, is a cross-platform
satisfiability modulo theories (SMT) solver.