Finn Thain wrote:
On Fri, 12 May 2016, George Spelvin wrote:
+# Old GCC versions fall back to -m5200 compilation, generating these calls
+# even though the CPU doesn't actually need it. See arch/m68k/Makefile.
The comment is vague. Does anyone know which GCC versions do or don't work
like this?
Yes, I looked it up in the archived GCC documentation. My current patch says:
(commit comment)
Since the compiler version is not known at Kconfig time, this cannot
be expressed in a CONFIG_ variable, but instead is handled by some
Makefile hackery. This only applies to GCC 4.2.4 and earlier, which
is hopefully almost everyone, but Documentation/Changes says GCC 3.2.
(arch/m68k/lib/Makefile)
+# GCC 4.2.4 and earlier don't know about ColdFire models that support
+# DIV.L and fall back to -m5200, generating these calls even though the
+# CPU doesn't actually need it. Not needed on GCC 4.3 or later.
+# See the $(call cc-option ...) lines in arch/m68k/Makefile.
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