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Re: -fno-builtin-function doesn't work?

On 04/19/2010 12:19 AM, Pan ruochen wrote:
$mips-linux-gnu-gcc -mips32r2 -EL -O2 -muclibc -msoft-float 1.c
/tmp/ccufhMGF.o: In function `main':
1.c:(.text+0x28): undefined reference to `sincos'
1.c:(.text+0x38): undefined reference to `sincos'

This isn't a linker issue, it is a gcc issue.

GCC has a macro TARGET_HAS_SINCOS which is defined in config/linux.h as
/* Whether we have sincos that follows the GNU extension.  */
The tree-ssa-math.c file performs this optimization if this is true.

So if you configure for a linux (glibc) target, then gcc will assume it can emit calls to sincos. You can configure for a uclibc target instead of configuring for a linux target, if one exists. Or you can submit a gcc bug report pointing out that -muclibc doesn't work right with respect to the sincos support. Or you could submit a uclibc bug report asking that they add sincos support.

You can also point out that -fno-builtins doesn't disable this optimization, as it should.


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