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MIPS/libunwind: Use -mfp64 if compiler is FPXX #68521

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Feb 8, 2024
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MIPS/libunwind: Use -mfp64 if compiler is FPXX #68521

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19 changes: 19 additions & 0 deletions libunwind/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ set(LIBUNWIND_LIBCXX_PATH "${CMAKE_CURRENT_LIST_DIR}/../libcxx" CACHE PATH
"Specify path to libc++ source.")

include(GNUInstallDirs)
include(CheckSymbolExists)

#===============================================================================
# Setup CMake Options
Expand Down Expand Up @@ -96,6 +97,20 @@ endif()
option(LIBUNWIND_HIDE_SYMBOLS
"Do not export any symbols from the static library." ${LIBUNWIND_DEFAULT_HIDE_SYMBOLS})

# If toolchain is FPXX, we switch to FP64 to save the full FPRs. See:
# https://web.archive.org/web/20180828210612/https://dmz-portal.mips.com/wiki/MIPS_O32_ABI_-_FR0_and_FR1_Interlinking
check_symbol_exists(__mips_hard_float "" __MIPSHF)
check_symbol_exists(_ABIO32 "" __MIPS_O32)
if (__MIPSHF AND __MIPS_O32)
file(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/mips_is_fpxx.c
"#if __mips_fpr != 0\n"
"# error\n"
"#endif\n")
try_compile(MIPS_FPABI_FPXX ${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/mips_is_fpxx.c
CMAKE_FLAGS -DCMAKE_C_LINK_EXECUTABLE='echo')
endif()

#===============================================================================
# Configure System
#===============================================================================
Expand Down Expand Up @@ -179,6 +194,10 @@ if (WIN32)
add_compile_flags_if_supported(-Wno-dll-attribute-on-redeclaration)
endif()

if (MIPS_FPABI_FPXX)
add_compile_flags(-mfp64)
endif()

# Get feature flags.
# Exceptions
# Catches C++ exceptions only and tells the compiler to assume that extern C
Expand Down
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