On 3 April 2012 09:06, dann frazier dann.frazier@canonical.com wrote:
On Fri, Mar 30, 2012 at 06:52:34PM +0100, Richard Earnshaw wrote:
On 29/03/12 20:34, dann frazier wrote:
This is an updated version of a patch Debian and Ubuntu are using to use an alternate linker path for hardfloat binaries. The difference with this one is that it covers the case where no float flag was passed in, defaulting to the softfloat path.
Hi Dann. The change should be in the EABI specific linux-eabi.h instead of the shared/OABI linux-elf.h. It breaks support for uClibc and Bionic by always using the GLIBC loader in hard float mode. The final line in the spec is missing a '=hard' and always adds /lib/ld-linux.so.3.
How about:
2012-04-03 Michael Hope michael.hope@linaro.org
* config/arm/linux-eabi.h (GLIBC_DYNAMIC_LINKER_HARD_FLOAT): Define. (GLIBC_DYNAMIC_LINKER): Redefine to use the hard float loader.
diff --git a/gcc/config/arm/linux-eabi.h b/gcc/config/arm/linux-eabi.h index 80bd825..8498472 100644 --- a/gcc/config/arm/linux-eabi.h +++ b/gcc/config/arm/linux-eabi.h @@ -62,7 +62,12 @@ /* Use ld-linux.so.3 so that it will be possible to run "classic" GNU/Linux binaries on an EABI system. */ #undef GLIBC_DYNAMIC_LINKER -#define GLIBC_DYNAMIC_LINKER "/lib/ld-linux.so.3" +#define GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "/lib/ld-linux.so.3" +#define GLIBC_DYNAMIC_LINKER_HARD_FLOAT "/lib/arm-linux-gnueabihf/ld-linux.so.3" +#define GLIBC_DYNAMIC_LINKER \ + "%{mhard-float:" GLIBC_DYNAMIC_LINKER_HARD_FLOAT "} \ + %{mfloat-abi=hard:" GLIBC_DYNAMIC_LINKER_HARD_FLOAT "} \ + %{!mfloat-abi=hard:%{!mhard-float:" GLIBC_DYNAMIC_LINKER_SOFT_FLOAT "}}"
/* At this point, bpabi.h will have clobbered LINK_SPEC. We want to use the GNU/Linux version, not the generic BPABI version. */
which works for the following test cases: gcc -mhard-float foo.c => /lib/arm-linux-gnueabihf/ld-linux.so.3 gcc -mfloat-abi=hard foo.c => /lib/arm-linux-gnueabihf/ld-linux.so.3 gcc -msoft-float foo.c => /lib/ld-linux.so.3 gcc -mfloat-abi=softfp foo.c => /lib/ld-linux.so.3 gcc -mbionic => /system/bin/linker gcc -mbionic -mhard-float => /system/bin/linker gcc -muclibc => /lib/ld-uClibc.so.0 gcc -muclibc -mhard-float => /lib/ld-uClibc.so.0
-- Michael