[Jethro] Can't compile gcc-cross when gcc-6 is the host compiler

[Jethro] Can't compile gcc-cross when gcc-6 is the host compiler

[Jérémy Rosen]

Hello everybody

I am working on a jethro-based project on my Debian/testing machine, and 
debian just migrated it's default gcc from gcc-5 to gcc-6

As expected, this caused all sort of errors in my build, starting by 
pkgconfig-native not being compilable anymore (new gcc warnings coupled 
with -Werror)


That's OK. I don't expect jethro to support future compilers out of the 
box so I installed gcc-5 in parallel to gcc-6 while keeping gcc-6 as the 
default compiler.

I then set the following variables in local.conf

#gcc-5
export BUILD_CC = "${CCACHE}${BUILD_PREFIX}gcc-5 ${BUILD_CC_ARCH}"
export BUILD_CXX = "${CCACHE}${BUILD_PREFIX}g++-5 ${BUILD_CC_ARCH}"
export BUILD_FC = "${CCACHE}${BUILD_PREFIX}gfortran-5 ${BUILD_CC_ARCH}"
export BUILD_CPP = "${BUILD_PREFIX}gcc-5 ${BUILD_CC_ARCH} -E"
export BUILD_LD = "${BUILD_PREFIX}ld ${BUILD_LD_ARCH}"
export BUILD_CCLD = "${BUILD_PREFIX}gcc-5 ${BUILD_CC_ARCH}"
export BUILD_AR = "${BUILD_PREFIX}gcc-ar-5"
export BUILD_AS = "${BUILD_PREFIX}as ${BUILD_AS_ARCH}"
export BUILD_RANLIB = "${BUILD_PREFIX}gcc-ranlib-5"
export BUILD_STRIP = "${BUILD_PREFIX}strip"
export BUILD_NM = "${BUILD_PREFIX}gcc-nm-5"

This helped, and allowed me to go much further in my build, but the 
recipe gcc-cross-arm still failed. To be able to compile my build I had 
to add the following to my local.conf

CC_pn-gcc-cross-arm= "${BUILD_CC}"
CXX_pn-gcc-cross-arm= "${BUILD_CXX}"
CC_pn-gcc-crosssdk-x86_64= "${BUILD_CC}"
CXX_pn-gcc-crosssdk-x86_64= "${BUILD_CXX}"


So apparently, gcc still has some reference to $CC and $CXX hardcoded 
somewhere (I think it's in do_configure)

It seems to set $CC in the do_compile correctly, but not in 
do_configure. And it never sets $CXX

I tried to understand what the GCC recipe was doing wrong, but I 
couldn't find out on first look and it's a really complicated recipe


I hope this is enough clues to allow someone more knowledgeable to 
create a proper fix...


Regards

Jeremy Rosen

Re: [Jethro] Can't compile gcc-cross when gcc-6 is the host compiler

[Burton, Ross]

On 11 August 2016 at 13:40, Jérémy Rosen <jeremy.rosen@smile.fr> wrote:

> This helped, and allowed me to go much further in my build, but the recipe
> gcc-cross-arm still failed. To be able to compile my build I had to add the
> following to my local.conf
>
> CC_pn-gcc-cross-arm= "${BUILD_CC}"
> CXX_pn-gcc-cross-arm= "${BUILD_CXX}"
> CC_pn-gcc-crosssdk-x86_64= "${BUILD_CC}"
> CXX_pn-gcc-crosssdk-x86_64= "${BUILD_CXX}"
>
>
> So apparently, gcc still has some reference to $CC and $CXX hardcoded
> somewhere (I think it's in do_configure)
>
> It seems to set $CC in the do_compile correctly, but not in do_configure.
> And it never sets $CXX
>
> I tried to understand what the GCC recipe was doing wrong, but I couldn't
> find out on first look and it's a really complicated recipe
>

Could you try adding a do_configure_prepend to gcc-cross.inc that sets
exports those (and extend the do_compile exports) to see if that solves it?

Ross

Re: [Jethro] Can't compile gcc-cross when gcc-6 is the host compiler

[Jérémy Rosen]

On 11/08/2016 21:38, Burton, Ross wrote:
> On 11 August 2016 at 13:40, Jérémy Rosen <jeremy.rosen@smile.fr> wrote:
>
>> This helped, and allowed me to go much further in my build, but the recipe
>> gcc-cross-arm still failed. To be able to compile my build I had to add the
>> following to my local.conf
>>
>> CC_pn-gcc-cross-arm= "${BUILD_CC}"
>> CXX_pn-gcc-cross-arm= "${BUILD_CXX}"
>> CC_pn-gcc-crosssdk-x86_64= "${BUILD_CC}"
>> CXX_pn-gcc-crosssdk-x86_64= "${BUILD_CXX}"
>>
>>
>> So apparently, gcc still has some reference to $CC and $CXX hardcoded
>> somewhere (I think it's in do_configure)
>>
>> It seems to set $CC in the do_compile correctly, but not in do_configure.
>> And it never sets $CXX
>>
>> I tried to understand what the GCC recipe was doing wrong, but I couldn't
>> find out on first look and it's a really complicated recipe
>>
> Could you try adding a do_configure_prepend to gcc-cross.inc that sets
> exports those (and extend the do_compile exports) to see if that solves it?

I did the following

diff --git a/meta/recipes-devtools/gcc/gcc-cross.inc 
b/meta/recipes-devtools/gcc/gcc-cross.inc
index aa10633..9a2e06f 100644
--- a/meta/recipes-devtools/gcc/gcc-cross.inc
+++ b/meta/recipes-devtools/gcc/gcc-cross.inc
@@ -36,8 +36,14 @@ EXTRA_OECONF_PATHS = "\

  ARCH_FLAGS_FOR_TARGET += 
"-isystem${STAGING_DIR_TARGET}${target_includedir}"

+do_configure_prepend () {
+    export CC="${BUILD_CC}"
+    export CXX="${BUILD_CXX}"
+}
+
  do_compile () {
      export CC="${BUILD_CC}"
+    export CXX="${BUILD_CXX}"
      export AR_FOR_TARGET="${TARGET_SYS}-ar"
      export RANLIB_FOR_TARGET="${TARGET_SYS}-ranlib"
      export LD_FOR_TARGET="${TARGET_SYS}-ld"


(which I think is what you meant) and it did indeed solve the problem.

> Ross

Re: [Jethro] Can't compile gcc-cross when gcc-6 is the host compiler

[Burton, Ross]

On 12 August 2016 at 14:38, Jérémy Rosen <jeremy.rosen@smile.fr> wrote:

> (which I think is what you meant) and it did indeed solve the problem.
>

Cool. If you can rebase this to master and submit it as a proper patch then
that would be much appreciated.

Ross

Re: [Jethro] Can't compile gcc-cross when gcc-6 is the host compiler

[Khem Raj]

On 16-08-12 15:38:52, Jérémy Rosen wrote:
> 
> 
> On 11/08/2016 21:38, Burton, Ross wrote:
> >On 11 August 2016 at 13:40, Jérémy Rosen <jeremy.rosen@smile.fr> wrote:
> >
> >>This helped, and allowed me to go much further in my build, but the recipe
> >>gcc-cross-arm still failed. To be able to compile my build I had to add the
> >>following to my local.conf
> >>
> >>CC_pn-gcc-cross-arm= "${BUILD_CC}"
> >>CXX_pn-gcc-cross-arm= "${BUILD_CXX}"
> >>CC_pn-gcc-crosssdk-x86_64= "${BUILD_CC}"
> >>CXX_pn-gcc-crosssdk-x86_64= "${BUILD_CXX}"
> >>
> >>
> >>So apparently, gcc still has some reference to $CC and $CXX hardcoded
> >>somewhere (I think it's in do_configure)
> >>
> >>It seems to set $CC in the do_compile correctly, but not in do_configure.
> >>And it never sets $CXX
> >>
> >>I tried to understand what the GCC recipe was doing wrong, but I couldn't
> >>find out on first look and it's a really complicated recipe
> >>
> >Could you try adding a do_configure_prepend to gcc-cross.inc that sets
> >exports those (and extend the do_compile exports) to see if that solves it?
> 
> I did the following
> 
> diff --git a/meta/recipes-devtools/gcc/gcc-cross.inc
> b/meta/recipes-devtools/gcc/gcc-cross.inc
> index aa10633..9a2e06f 100644
> --- a/meta/recipes-devtools/gcc/gcc-cross.inc
> +++ b/meta/recipes-devtools/gcc/gcc-cross.inc
> @@ -36,8 +36,14 @@ EXTRA_OECONF_PATHS = "\
> 
>  ARCH_FLAGS_FOR_TARGET +=
> "-isystem${STAGING_DIR_TARGET}${target_includedir}"
> 
> +do_configure_prepend () {
> +    export CC="${BUILD_CC}"
> +    export CXX="${BUILD_CXX}"
> +}
> +
>  do_compile () {
>      export CC="${BUILD_CC}"
> +    export CXX="${BUILD_CXX}"
>      export AR_FOR_TARGET="${TARGET_SYS}-ar"
>      export RANLIB_FOR_TARGET="${TARGET_SYS}-ranlib"
>      export LD_FOR_TARGET="${TARGET_SYS}-ld"
> 
> 
> (which I think is what you meant) and it did indeed solve the problem.

this looks ok.

Re: [Jethro] Can't compile gcc-cross when gcc-6 is the host compiler

[Khem Raj]

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> On Aug 11, 2016, at 5:40 AM, Jérémy Rosen <jeremy.rosen@smile.fr> wrote:
> 
> Hello everybody
> 
> I am working on a jethro-based project on my Debian/testing machine, and debian just migrated it's default gcc from gcc-5 to gcc-6
> 
> As expected, this caused all sort of errors in my build, starting by pkgconfig-native not being compilable anymore (new gcc warnings coupled with -Werror)
> 
> 
> That's OK. I don't expect jethro to support future compilers out of the box so I installed gcc-5 in parallel to gcc-6 while keeping gcc-6 as the default compiler.
> 
> I then set the following variables in local.conf
> 
> #gcc-5
> export BUILD_CC = "${CCACHE}${BUILD_PREFIX}gcc-5 ${BUILD_CC_ARCH}"
> export BUILD_CXX = "${CCACHE}${BUILD_PREFIX}g++-5 ${BUILD_CC_ARCH}"
> export BUILD_FC = "${CCACHE}${BUILD_PREFIX}gfortran-5 ${BUILD_CC_ARCH}"
> export BUILD_CPP = "${BUILD_PREFIX}gcc-5 ${BUILD_CC_ARCH} -E"
> export BUILD_LD = "${BUILD_PREFIX}ld ${BUILD_LD_ARCH}"
> export BUILD_CCLD = "${BUILD_PREFIX}gcc-5 ${BUILD_CC_ARCH}"
> export BUILD_AR = "${BUILD_PREFIX}gcc-ar-5"
> export BUILD_AS = "${BUILD_PREFIX}as ${BUILD_AS_ARCH}"
> export BUILD_RANLIB = "${BUILD_PREFIX}gcc-ranlib-5"
> export BUILD_STRIP = "${BUILD_PREFIX}strip"
> export BUILD_NM = "${BUILD_PREFIX}gcc-nm-5"
> 
> This helped, and allowed me to go much further in my build, but the recipe gcc-cross-arm still failed. To be able to compile my build I had to add the following to my local.conf
> 
> CC_pn-gcc-cross-arm= "${BUILD_CC}"
> CXX_pn-gcc-cross-arm= "${BUILD_CXX}"
> CC_pn-gcc-crosssdk-x86_64= "${BUILD_CC}"
> CXX_pn-gcc-crosssdk-x86_64= "${BUILD_CXX}"
> 
> 
> So apparently, gcc still has some reference to $CC and $CXX hardcoded somewhere (I think it's in do_configure)
> 
> It seems to set $CC in the do_compile correctly, but not in do_configure. And it never sets $CXX
> 
> I tried to understand what the GCC recipe was doing wrong, but I couldn't find out on first look and it's a really complicated recipe
> 
> 
> I hope this is enough clues to allow someone more knowledgeable to create a proper fix…


Just change the default gcc to gcc5 on your host. The host packages do not isolate compiler as well as target packages.

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