Andreas Metzler schrieb am Dienstag, 26. Oktober 2021 um 08:21:25 UTC+2:
>
> > Could you please test, if this fixes your issues?
> [...]
> > -set(_common_libs ${TIFF_LIBRARIES} ${ZLIB_LIBRARIES} ${JPEG_LIBRARIES}
> ${PNG_LIBRARIES})
> > +# check if libm needs additional linker flag
> > +include(CheckCSourceCompiles)
> > +set(LIBM_TEST_SRC "#include <math.h>\nint main() { float f=exp(2.0);
> }")
> > +check_c_source_compiles("${LIBM_TEST_SRC}" HAVE_EXP)
>
> This check succeeds with gcc because of the gcc-builtin
> https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
> https://gcc.gnu.org/onlinedocs/gcc/C-Dialect-Options.html#index-fno-builtin
> is used but fails later in the real build where the gcc-builtin is not
> used. (ansi or or std options set there.)
>
> Sorry, but I don't understand.
According the the doc of CheckCSourceCompiles, it should take all flags
into consideration:
CMAKE_REQUIRED_FLAGS
Additional flags to pass to the compiler. Note that the contents of
CMAKE_C_FLAGS and its associated configuration-specific variable are
automatically added to the compiler command before the contents of
CMAKE_REQUIRED_FLAGS.
So where do you add -fno-builtin?
Thomas
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