Bug#762640: gfortran-4.9: generates buggy assembler at -O2 on armhf
Package: gfortran-4.9
Version: 4.9.1-15
Severity: important
nwchem FTBFS on armhf, see e.g.
https://buildd.debian.org/status/fetch.php?pkg=nwchem&arch=armhf&ver=6.3%2Br2-1&stamp=1410744209
|gfortran -c -g -O2 -ffast-math -fno-aggressive-loop-optimizations -O2
| -ffast-math -Wuninitialized -I. -I../include -I./include
| -I/«BUILDDIR»/nwchem-6.3+r2/src/include
| -I/«BUILDDIR»/nwchem-6.3+r2/src/tools/install/include -DLINUX
| -DGCC4 -DGCC46 -DGFORTRAN -DPARALLEL_DIAG -DMRCC_METHODS
| tce_mrcc_energy.F
|/tmp/ccmB6kme.s: Assembler messages:
|/tmp/ccmB6kme.s:6881: Error: offset out of range
|/tmp/ccmB6kme.s:6885: Error: offset out of range
|make[5]: ***
|[/«BUILDDIR»/nwchem-6.3+r2/lib/LINUX/libtce.a(tce_mrcc_energy.o)]
|Error 1
This is a regression from earlier versions of gfortran-4.9, other arches
seem fine.
If -O2 is replaced with -O1, it builds fine.
The preprocessed source can be found here:
https://people.debian.org/~mbanck/tce_mrcc_energy.f
It should (not) build like this: "gfortran -O2 -c tce_mrcc_energy.f"
The assembler output for -O1 and -O2, respectively, can be found here:
https://people.debian.org/~mbanck/tce_mrcc_energy.s.ok
https://people.debian.org/~mbanck/tce_mrcc_energy.s.wrong
Michael
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