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Description of problem: the clang family of compilers does not contain the "flang" front-end to compile Fortran code. I need it to install R packages. I'm testing the ability to use a LLVM-based toolchain to generate R binary packages.
Version-Release number of selected component (if applicable): clang-12.0.1
How reproducible: I tried bulding flang myself from Fedora 34 flang-12.0.1 srpm, but it fails while generating the doc
Steps to Reproduce:
1. cd rpmbuild
2. [setup the tree from flang-12.0.1]
3. rpmbuild -bb SPECS/flang.spec
Actual results: no rpm generated
Expected results: rpm generated
Additional info: the rpm in Fedora 34 can not be installed at it requires a glibc2 which is ahead of CentOS Stream
I had to patch the spec file as follows:
--- SPECS/flang.spec.orig 2021-11-29 13:05:11.502486310 +0100
+++ SPECS/flang.spec 2021-11-29 12:48:50.447496725 +0100
@@ -23,6 +23,10 @@
# because mlir doesn't build on arm (yet)
ExcludeArch: armv7hl
+# see https://www.spinics.net/lists/fedora-devel/msg274761.html
+# Force out of source build
+%undefine __cmake_in_source_build
+
# Avoid gcc reaching 4GB of memory on 32-bit targets and also running out of
# memory on builders with many CPUs.
%ifarch %{ix86} s390x x86_64 ppc64le