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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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2
.github/matrix.py vendored
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@ -152,7 +152,7 @@ def main(ref_name):
"USE_OBSOLETE_LINKER=1",
'DEBUG_CFLAGS="-g -fsanitize=address"',
'LDFLAGS="-fsanitize=address"',
'CPU_CFLAGS.generic="-O1"',
'OPT_CFLAGS="-O1"',
"USE_ZLIB=1",
"USE_OT=1",
"OT_INC=${HOME}/opt-ot/include",

4
INSTALL
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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

35
Makefile
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@ -76,6 +76,7 @@
# CC is set to "cc" by default and is used for compilation only.
# LD is set to "cc" by default and is used for linking only.
# ARCH may be useful to force build of 32-bit binary on 64-bit systems
# OPT_CFLAGS sets the default optimization level (-O2).
# CFLAGS may be used to append any flags for the C compiler.
# LDFLAGS is automatically set to -g and may be overridden.
# DEP may be cleared to ignore changes to include files during development
@ -169,6 +170,11 @@ ARCH =
CC = cc
LD = $(CC)
#### Default optimizations
# Those are integrated early in the list of CFLAGS, and may be overridden by
# other CFLAGS options if needed.
OPT_CFLAGS = -O2
#### Debug flags (typically "-g").
# Those flags only feed CFLAGS so it is not mandatory to use this form.
DEBUG_CFLAGS = -g
@ -258,17 +264,17 @@ EXTRA =
# feed CPU_CFLAGS, which in turn feed CFLAGS, so it is not mandatory to use
# them. You should not have to change these options. Better use CPU_CFLAGS or
# even CFLAGS instead.
CPU_CFLAGS.generic = -O2
CPU_CFLAGS.native = -O2 -march=native
CPU_CFLAGS.i586 = -O2 -march=i586
CPU_CFLAGS.i686 = -O2 -march=i686
CPU_CFLAGS.ultrasparc = -O6 -mcpu=v9 -mtune=ultrasparc
CPU_CFLAGS.power8 = -O2 -mcpu=power8 -mtune=power8
CPU_CFLAGS.power9 = -O2 -mcpu=power9 -mtune=power9
CPU_CFLAGS.a53 = -O2 -mcpu=cortex-a53
CPU_CFLAGS.a72 = -O2 -mcpu=cortex-a72
CPU_CFLAGS.armv81 = -O2 -march=armv8.1-a
CPU_CFLAGS.armv8-auto = -O2 -march=armv8-a+crc -moutline-atomics
CPU_CFLAGS.generic =
CPU_CFLAGS.native = -march=native
CPU_CFLAGS.i586 = -march=i586
CPU_CFLAGS.i686 = -march=i686
CPU_CFLAGS.ultrasparc = -mcpu=v9 -mtune=ultrasparc
CPU_CFLAGS.power8 = -mcpu=power8 -mtune=power8
CPU_CFLAGS.power9 = -mcpu=power9 -mtune=power9
CPU_CFLAGS.a53 = -mcpu=cortex-a53
CPU_CFLAGS.a72 = -mcpu=cortex-a72
CPU_CFLAGS.armv81 = -march=armv8.1-a
CPU_CFLAGS.armv8-auto = -march=armv8-a+crc -moutline-atomics
CPU_CFLAGS = $(CPU_CFLAGS.$(CPU))
#### ARCH dependent flags, may be overridden by CPU flags
@ -468,7 +474,7 @@ $(set_target_defaults)
# linking with it by default as it's not always available nor deployed
# (especially on archs which do not need it).
ifneq ($(USE_THREAD:0=),)
ifneq ($(shell $(CC) $(ARCH_FLAGS) $(CPU_CFLAGS) $(DEBUG_CFLAGS) $(SPEC_CFLAGS) $(CFLAGS) -dM -E -xc - </dev/null 2>/dev/null | grep -c 'LOCK_FREE.*1'),0)
ifneq ($(shell $(CC) $(OPT_CFLAGS) $(ARCH_FLAGS) $(CPU_CFLAGS) $(DEBUG_CFLAGS) $(SPEC_CFLAGS) $(CFLAGS) -dM -E -xc - </dev/null 2>/dev/null | grep -c 'LOCK_FREE.*1'),0)
USE_LIBATOMIC = implicit
endif
endif
@ -837,10 +843,10 @@ endif
$(collect_opts_flags)
#### Global compile options
VERBOSE_CFLAGS = $(ARCH_FLAGS) $(CPU_CFLAGS) $(DEBUG_CFLAGS) $(SPEC_CFLAGS) $(TARGET_CFLAGS) $(CFLAGS) $(DEFINE)
VERBOSE_CFLAGS = $(OPT_CFLAGS) $(ARCH_FLAGS) $(CPU_CFLAGS) $(DEBUG_CFLAGS) $(SPEC_CFLAGS) $(TARGET_CFLAGS) $(CFLAGS) $(DEFINE)
COPTS = -Iinclude
COPTS += $(ARCH_FLAGS) $(CPU_CFLAGS) $(DEBUG_CFLAGS) $(SPEC_CFLAGS) $(TARGET_CFLAGS) $(DEFINE) $(SILENT_DEFINE)
COPTS += $(OPT_CFLAGS) $(ARCH_FLAGS) $(CPU_CFLAGS) $(DEBUG_CFLAGS) $(SPEC_CFLAGS) $(TARGET_CFLAGS) $(DEFINE) $(SILENT_DEFINE)
COPTS += $(DEBUG) $(OPTIONS_CFLAGS) $(CFLAGS) $(ADDINC)
ifneq ($(VERSION)$(SUBVERS)$(EXTRAVERSION),)
@ -1148,6 +1154,7 @@ opts:
@echo -n 'ARCH="$(strip $(ARCH))" '
@echo -n 'CPU="$(strip $(CPU))" '
@echo -n 'CC="$(strip $(CC))" '
@echo -n 'OPT_CFLAGS="$(strip $(OPT_CFLAGS))" '
@echo -n 'ARCH_FLAGS="$(strip $(ARCH_FLAGS))" '
@echo -n 'CPU_CFLAGS="$(strip $(CPU_CFLAGS))" '
@echo -n 'DEBUG_CFLAGS="$(strip $(DEBUG_CFLAGS))" '