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BUILD: Makefile: improve detection of support for compiler warnings 

Some compiler versions don't emit an error when facing an unknown
no-warning unless another error is reported, resulting in all -Wno-*
options being enabled by default and being reported as wrong with
build errors. Let's create a new "cc-nowarn" function to disable
warnings only after checking that the positive one is supported.
This commit is contained in:
Willy Tarreau 2017-09-14 19:05:45 +02:00
parent 065843c876
commit b780166499
1 changed files with 9 additions and 3 deletions
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12
Makefile
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@ -96,6 +96,12 @@
# call it only once.
cc-opt = $(shell set -e; if $(CC) $(1) -c -xc - -o /dev/null </dev/null >&0 2>&0; then echo "$(1)"; fi;)
# Disable a warning when supported by the compiler. Don't put spaces around the
# warning! And don't use cc-opt which doesn't always report an error until
# another one is also returned.
# Usage: CFLAGS += $(call cc-nowarn,warning). Eg: $(call cc-opt,format-truncation)
cc-nowarn = $(shell set -e; if $(CC) -W$(1) -c -xc - -o /dev/null </dev/null >&0 2>&0; then echo "-Wno-$(1)"; fi;)
#### Installation options.
DESTDIR =
PREFIX = /usr/local
@ -140,9 +146,9 @@ DEBUG_CFLAGS = -g
# to be sure we get the intended behavior.
SPEC_CFLAGS := -fno-strict-aliasing -Wdeclaration-after-statement
SPEC_CFLAGS += $(call cc-opt,-fwrapv)
SPEC_CFLAGS += $(call cc-opt,-Wno-format-truncation)
SPEC_CFLAGS += $(call cc-opt,-Wno-address-of-packed-member)
SPEC_CFLAGS += $(call cc-opt,-Wno-null-dereference)
SPEC_CFLAGS += $(call cc-nowarn,format-truncation)
SPEC_CFLAGS += $(call cc-nowarn,address-of-packed-member)
SPEC_CFLAGS += $(call cc-nowarn,null-dereference)
#### Memory usage tuning
# If small memory footprint is required, you can reduce the buffer size. There