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zephyr/cmake/compiler/gcc/target_x86.cmake

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cmake: need to specify m32/m64 for x86_64 toolchain Since x86_64-zephyr-elf is a multi-lib toolchain, m32/m64 need to be specified for the compiler to return the correct library path when queried (e.g. --print-libgcc-file-name). This affects the compile check done by CMake. Without these flags, the compiler returns incorrect toolchain path (e.g. requiring 64-bit libraries but returning 32-bit library path). This also affects compiler flag checks for "-lstdc++". Incorrect library path results in error when checking for "-lstdc++", and this flag will not be used for the build. This results in undefined references when compiling C++ code. This creates target_x86.cmake to add the necessary flags for CMake to use. The target_x86_64.cmake is also created to mirror the same change. Also removing the -m32 flags for host-gcc since we are not building x86 targets with the host-gcc compiler. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
2019-10-08 16:14:02 +08:00
# SPDX-License-Identifier: Apache-2.0
if(CONFIG_X86_64)
string(PREPEND CMAKE_ASM_FLAGS "-m64 ")
string(PREPEND CMAKE_C_FLAGS "-m64 ")
string(PREPEND CMAKE_CXX_FLAGS "-m64 ")
else()
string(PREPEND CMAKE_ASM_FLAGS "-m32 ")
string(PREPEND CMAKE_C_FLAGS "-m32 ")
string(PREPEND CMAKE_CXX_FLAGS "-m32 ")
endif()
cmake: add --divide to GNU assembler options for x86 GNU Assembler, by default on non-Linux targets, treats slashes as start of comments on i386. (https://sourceware.org/binutils/docs-2.33.1/as/i386_002dChars.html#i386_002dChars) In order to use division, `--divide` needs to be passed to the assembler. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
2019-10-30 03:58:07 +08:00
# GNU Assembler, by default on non-Linux targets, treats slashes as
# start of comments on i386.
# (https://sourceware.org/binutils/docs-2.33.1/as/i386_002dChars.html#i386_002dChars)
# In order to use division, `--divide` needs to be passed to
# the assembler.
list(APPEND TOOLCHAIN_C_FLAGS -Wa,--divide)