Re: Fedora 32 System-Wide Change proposal: Use update-alternatives for /usr/bin/cc and /usr/bin/c++

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On 01/13/2020 06:20 AM, Vít Ondruch wrote:
> 
> Dne 11. 01. 20 v 5:46 Tom Stellard napsal(a):
>> On 01/08/2020 11:28 PM, Miro Hrončok wrote:
>>> On 08. 01. 20 23:47, Tom Stellard wrote:
>>>> I suspect that if I can find some way to set the CC and CXX environment
>>>> variables for all builds, not just ones using autoconf, cmake or meson,
>>>> that might help cut down on the number of packages that still use gcc.
>>>> I'm just not quite sure how to implement this yet, but I'm looking into
>>>> it.
>>> /usr/lib/rpm/macros has:
>>>
>>> %___build_pre    \
>>>   RPM_SOURCE_DIR=\"%{u2p:%{_sourcedir}}\"\
>>>   RPM_BUILD_DIR=\"%{u2p:%{_builddir}}\"\
>>>   RPM_OPT_FLAGS=\"%{optflags}\"\
>>>   RPM_LD_FLAGS=\"%{?build_ldflags}\"\
>>>   RPM_ARCH=\"%{_arch}\"\
>>>   RPM_OS=\"%{_os}\"\
>>>   RPM_BUILD_NCPUS=\"%{_smp_build_ncpus}\"\
>>>   export RPM_SOURCE_DIR RPM_BUILD_DIR RPM_OPT_FLAGS RPM_LD_FLAGS RPM_ARCH RPM_OS RPM_BUILD_NCPUS RPM_LD_FLAGS\
>>>   RPM_DOC_DIR=\"%{_docdir}\"\
>>>   export RPM_DOC_DIR\
>>>   RPM_PACKAGE_NAME=\"%{NAME}\"\
>>>   RPM_PACKAGE_VERSION=\"%{VERSION}\"\
>>>   RPM_PACKAGE_RELEASE=\"%{RELEASE}\"\
>>>   export RPM_PACKAGE_NAME RPM_PACKAGE_VERSION RPM_PACKAGE_RELEASE\
>>>   LANG=C\
>>>   export LANG\
>>>   unset CDPATH DISPLAY ||:\
>>>   %{?buildroot:RPM_BUILD_ROOT=\"%{u2p:%{buildroot}}\"\
>>>   export RPM_BUILD_ROOT}\
>>>   %{?_javaclasspath:CLASSPATH=\"%{_javaclasspath}\"\
>>>   export CLASSPATH}\
>>>
>>> PKG_CONFIG_PATH=\"${PKG_CONFIG_PATH}:%{_libdir}/pkgconfig:%{_datadir}/pkgconfig\"\
>>>   export PKG_CONFIG_PATH\
>>>   CONFIG_SITE=${CONFIG_SITE:-NONE}\
>>>   export CONFIG_SITE\
>>>   \
>>>   %{verbose:set -x}\
>>>   umask 022\
>>>   cd \"%{u2p:%{_builddir}}\"\
>>>
>>>
>>> You should b able to expand (redefine anywhere else) this macro to set the variables you need or call %set_build_flags.
>>>
>> I did another mass rebuild, this time setting the CC and CXX environment variables
>> in __build_pre as you suggested.  The numbers look a little better now:
>>
>> Packages Built:    4271
>> Built with clang:  3355
>> Built with gcc:    916
>>
>> cc or c++ was invoked by about 50 packages.
> 
> 
> I just wonder, are there builds done in any particular order? E.g. build
> Ruby prior any rubygem- package, build Python prior python- packages, etc.
> 

No, I'm just building them all with mock and not into a buildroot.  I know
this causes an issue with perl and python packages, because they inherit
their cflags from the cflags used to build the interpreter.

-Tom

> 
> Vít
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