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gcc/picolibc: Disable -fprintf-return-value when printf is not complete

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GCC will compute expected sprintf (et al) return values internally and use
them in place of the actual return value. When the printf implementation
has reduced functionality, gcc may compute a different value.

For picolibc, this means disabling the optimization unless floating point
output is enabled.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard 2022-10-13 15:04:00 -07:00 • committed by Stephanos Ioannidis
commit b3073f0099
3 changed files with 9 additions and 0 deletions
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2
cmake/compiler/gcc/compiler_flags.cmake
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@ -111,6 +111,8 @@ if (NOT CONFIG_NEWLIB_LIBC AND
set_compiler_property(APPEND PROPERTY nostdinc_include ${NOSTDINC})
endif()
set_compiler_property(PROPERTY no_printf_return_value -fno-printf-return-value)
set_compiler_property(TARGET compiler-cpp PROPERTY nostdincxx "-nostdinc++")
# Required C++ flags when using gcc