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BUILD: makefile: move -O2 from CPU_CFLAGS to OPT_CFLAGS

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CPU_CFLAGS is meant to set the CPU-specific options (-mcpu, -march etc).
The fact that it also includes the optimization level is annoying because
one cannot be set without replacing the other. Let's move the optimization
level to a new independent OPT_CFLAGS that is added early to the list, so
that other CFLAGS (including CPU_CFLAGS) can continue to override it if
necessary.
This commit is contained in:
Willy Tarreau
2024-04-10 16:26:34 +02:00
parent 97725dd136
commit 8194499bec
3 changed files with 26 additions and 15 deletions
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@@ -583,6 +583,10 @@ A generic CFLAGS variable may be set to append any option to pass to the C
compiler. These flags are passed last so the variable may be used to override
other options such as warnings, optimization levels, include paths etc.
A default optimization level of -O2 is set by variable OPT_CFLAGS which may be
overridden if desired. It's used early in the list of CFLAGS so that any other
set of CFLAGS providing a different value may easily override it.
If you are building for a different system than the one you're building on,
this is called "cross-compiling". HAProxy supports cross-compilation pretty
well and tries to ease it by letting you adjust paths to all libraries (please