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authorPaul Burton <paul.burton@mips.com>2019-01-29 00:16:22 +0100
committerPaul Burton <paul.burton@mips.com>2019-01-29 20:50:58 +0100
commit67fc5dc8a541e8f458d7f08bf88ff55933bf9f9d (patch)
tree348be20f9f2f0a3376d9e48a75bb23607b7448cb /Documentation/mtd
parentMIPS: VDSO: Use same -m%-float cflag as the kernel proper (diff)
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MIPS: VDSO: Include $(ccflags-vdso) in o32,n32 .lds builds
When generating vdso-o32.lds & vdso-n32.lds for use with programs running as compat ABIs under 64b kernels, we previously haven't included the compiler flags that are supposedly common to all ABIs - ie. those in the ccflags-vdso variable. This is problematic in cases where we need to provide the -m%-float flag in order to ensure that we don't attempt to use a floating point ABI that's incompatible with the target CPU & ABI. For example a toolchain using current gcc trunk configured --with-fp-32=xx fails to build a 64r6el_defconfig kernel with the following error: cc1: error: '-march=mips1' requires '-mfp32' make[2]: *** [arch/mips/vdso/Makefile:135: arch/mips/vdso/vdso-o32.lds] Error 1 Include $(ccflags-vdso) for the compat VDSO .lds builds, just as it is included for the native VDSO .lds & when compiling objects for the compat VDSOs. This ensures we consistently provide the -msoft-float flag amongst others, avoiding the problem by ensuring we're agnostic to the toolchain defaults. Signed-off-by: Paul Burton <paul.burton@mips.com> Fixes: ebb5e78cc634 ("MIPS: Initial implementation of a VDSO") Cc: linux-mips@vger.kernel.org Cc: Kevin Hilman <khilman@baylibre.com> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Maciej W . Rozycki <macro@linux-mips.org> Cc: stable@vger.kernel.org # v4.4+
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