[petsc-users] Weird handling of compiler flags by the build system

[Barry Smith]

   I have added two MR to hopefully improve PETSc usability based on your issues

https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/merge_requests/7663__;!!G_uCfscf7eWS!efrDwkgUkc276It23vyi4kUxZ3ieab1AgseqAOCvE-K9-nLNjd6aad4rmdaRExARms_zfeExsNtm5lRx_b5ezSM$ 
Add information to template Makefile.user indicating what parts can easily be... (!7663) · Merge requests · PETSc / petsc · GitLab
gitlab.com
 
to clarify in Makefile.User how to remove the PETSc build compiler flags and

https://urldefense.us/v3/__https://gitlab.com/petsc/petsc/-/merge_requests/7662__;!!G_uCfscf7eWS!efrDwkgUkc276It23vyi4kUxZ3ieab1AgseqAOCvE-K9-nLNjd6aad4rmdaRExARms_zfeExsNtm5lRxbVNm9-g$ 
Additional documentation in configure for CFLAGS and friends (!7662) · Merge requests · PETSc / petsc · GitLab
gitlab.com

additional clarification in the docs for CFLAGS and friends and how they work

Barry


> On Jul 1, 2024, at 12:08 PM, meator <meator.dev at gmail.com> wrote:
> 
> On 7/1/24 5:23 PM, Stefano Zampini wrote:
>>    This is unfortunate. I assume that patching the buildsystem or some
>>    other trickery will be necessary if what you're saying is true.
>> I admit it is not so standard, but Satish always opposed this.
>> No need to hack the buildsystem, just use COPTFLAGS, CXXOPTFLAGS and FOPTFLAGS
> 
> I will try using *OPTFLAGS, thanks!
> 
>> I don't think you should use Makefile.user. That is there as a sort of template/placeholder. The extra variables are not included in a standard usage of pkgconfig, so I don't think this issue is "severe"
> 
> This is not a choice I get to make. The users of my package may choose to use PETSc however they want. And /usr/share/petsc/Makefile.user or /usr/share/petsc/CMakeLists.txt are officially supported ways of using PETSc, so deciding to ignore these use cases and leaving junk flags in /usr/lib/pkgconfig/petsc.pc is not tolerable for me.
> <OpenPGP_0x1A14CB3464CBE5BF.asc>

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