Red Hat Bugzilla – Bug 224108
%configure macro generates unusable FFLAGS
Last modified: 2015-05-04 21:32:54 EDT
Description of problem: %configure macro sets FFLAGS to CFLAGS, which adds -fstack-protector, --param=ssp-buffer-size=4, and -mtune=generic to FFLAGS. Neither g77 or gfortran accept these options, making it impossible to build packages with "system default" optimization flags. Version-Release number of selected component (if applicable): redhat-rpm-config-8.0.45-6.noarch How reproducible: always Steps to Reproduce: 1. rpm --eval "%configure" Actual results: ... FFLAGS="${FFLAGS:--O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables}" ; export FFLAGS ; Expected results: FFLAGS to be set to something that can at least make executables. Additional info: I'm making a package that uses f77 or gfortran, and this is how configure barfs: configure:1850: checking for Fortran 77 compiler default output file name configure:1853: g77 -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector -- param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic -fasynchronous-unwind-tables conftest.f >&5 f771: error: unrecognized command line option "-fstack-protector" f771: error: invalid parameter `ssp-buffer-size' conftest.f:0: error: bad value (generic) for -mtune= switch configure:1856: $? = 1 configure: failed program was: | program main | | end configure:1895: error: Fortran 77 compiler cannot create executables
Hmmm...this bug slipped under the radar. I'll take a look. Jon.
Do you have a suggestion for an appropriate fix/set of flags to be using?
Since when this bug was reported, gfortran now (at least in F8) accepts and can build with the default RPM FFLAGS. I suspect it is desirable to retain those build flags where possible. If one tries to write a "portable" Makefile using the default Make implicit rules of .f -> .o, which is "$(FC) -c $(FFLAGS)" [see 'info make' and search for FC], it won't work since FC is by default defined to be f77: f771: error: unrecognized command line option "-fstack-protector" f771: error: invalid parameter `ssp-buffer-size' a2.f:0: error: bad value (generic) for -mtune= switch So I guess this is more complicated: If f77 is installed, we want RPM's FFLAGS to not include -fstack-protector, ssp-buffer-size, and omit or use something else for -mtune. If gfortran is installed and is the "preferred" Fortran system compiler for Fedora, then the default flags are fine, except Make doesn't conform. Perhaps the appropriate quick fix is to patch "make" so FC is defined to be gfortran, not f77 (make sure man pages & info files are updated too). Thoughts?
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For now, I'm closing this bug as alternative fixes are outside of the scope of the redhat-rpm-config package.
By closing it, you're saying "it's not my problem, go away". Is it possible to redirect this bug at 'make'?
Can't you just define FC to be the compiler you want? Or use autotools with a configure script to determine this in a portable fashion?
Ok, I'm passing this bug on. You're right, closing it because it's not my package isn't a good idea. However, part of the reason I closed before was because IMO you should be setting FC according to the compiler you want to use (through configure). But we'll see what the make maintainer thinks :)
Setting FC would probably be the easiest solution. make goes to extreme lengths to be useful "out of the box", with implicit rules and all. Array with default variable values is rich with conditionals, but all of them are compile-time settings (e.g. favoring "gpp" for c++ compiler on MS DOS). I don't think make should "guess" the right Fortran compiler for the user. That said, it is simple to change make to favor "gfortran". But I need to know what's the situation in Fortran community in general--is gfortran considered the de facto standard Fortran compiler on Fedora? Are there other Fortran systems? Are they commonplace? Are their users willing to bypass make logic with explicitly set FC? Should we use /etc/alternatives? I'm slightly biased towards changing the default to be gfortran, simply because picking f77 seems like defaulting to K&R C in gcc, but I don't know enough context to make this decision. Maybe fedora-devel-list would be the right choice for this discussion (or is there Fortran SIG?). Care to write a proposal?
changing version to 'rawhide' so this bug does not get closed w/ EOL bugs
Changing version to '9' as part of upcoming Fedora 9 GA. More information and reason for this action is here: http://fedoraproject.org/wiki/BugZappers/HouseKeeping
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Fedora 9 changed to end-of-life (EOL) status on 2009-07-10. Fedora 9 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. Thank you for reporting this bug and we are sorry it could not be fixed.