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cmake: fix build when using GNU binutils >= 2.38

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GNU binutils require specifying the Zicsr and Zifencei extensions
explicitly from version 2.38 onwards. Since both are needed for
building the kernel, we need to add a check for that.
We only check for the GCC version being >= 11.3, since that is the
first GCC version that ships with binutils 2.38 by default.
Check PR #776 for more information.

Signed-off-by: Florian Hofhammer <florian.hofhammer@fhofhammer.de>
This commit is contained in:
Florian Hofhammer
2022-02-24 15:03:23 +01:00
committed by Gerwin Klein
parent ab32a37398
commit c3e353955d
1 changed files with 11 additions and 0 deletions
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11
CMakeLists.txt
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@@ -124,6 +124,17 @@ elseif(KernelArchRiscV)
# enabled
string(APPEND _riscv_march "c")
# Determine if GNU toolchain is used and if yes, whether GCC version >= 11.3 (implies binutils version >= 2.38)
if(
CMAKE_ASM_COMPILER_ID STREQUAL "GNU"
AND CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL "11.3"
)
# Manually enable Zicsr and Zifencei extensions
# This became necessary due to a change in the default ISA version in GNU binutils 2.38 which is the
# default binutils version shipped with GCC 11.3
string(APPEND _riscv_march "_zicsr_zifencei")
endif()
string(APPEND common_flags " -march=${_riscv_march} -mabi=${_riscv_mabi}")
else()