QUERY · ISSUE

Unix port using gcc with clang flags

openby brettcannonopened 2023-07-26updated 2023-07-27

bug

I'm trying to build the Unix port, but I keep getting gcc: error: unrecognized command-line option ‘-Qunused-arguments’.

Looking at online docs, it looks like clang has that option, but gcc does not.

I have CC set to clang(both globally and when I run make, i.e., CC=clang make), but the Makefile seems to insist on using gcc and so I can't work around this by trying to use the appropriate compiler. https://github.com/micropython/micropython/blob/master/ports/unix/README.md also explicitly calls out gcc as the compiler to use.

CANDIDATE · PULL REQUEST

Fix unix/Makefile to build on OSX

mergedby blmorrisopened 2014-09-22updated 2014-09-23

Please comment and review - I am not an expert in the subtleties of Makefiles!

This unix/Makefile change should allow the unix port to build on OSX without breaking stmhal build on OSX or affecting other platforms. Tested build for unix and stmhal on OSX 10.7.5 (Lion):

Force OSX to compile with clang even if gcc is available
Change LDFLAGS syntax to be compatible with clang
Fix questionable syntax on line 90
Remove extraneous tab character on line 102

Assessment

S Sonnet · high

Both items concern the same root tension in unix/Makefile: clang-specific flags being incompatible with gcc. PR #871 addresses this on OSX by forcing clang when OSX is detected, which would make the clang flags appropriate. Issue #12097 is the inverse problem on a non-OSX platform where gcc is being used but clang flags are present. The PR does not resolve #12097 because it only targets OSX/Darwin and does not fix the general case where clang flags are emitted regardless of the actual compiler in use.

Suggested action

Keep issue #12097 open. Reference PR #871 as prior context showing the same Makefile area was already patched for OSX. The underlying problem — clang-specific flags being used unconditionally — still needs a fix for non-OSX platforms where gcc is the default or where the user explicitly sets CC=gcc.

Unix port using gcc with clang flags

Fix unix/Makefile to build on OSX

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