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BUILD: makefile: Redirect stderr to /dev/null when probing options

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It is a workaround to avoid a clang 11 bug that exits with SIGABRT when
stderr is redirected to stdin. This bug was already reported few weeks ago:

  https://bugs.llvm.org/show_bug.cgi?id=49463

But because it is pretty annoying, the standard error is now redirected to
/dev/null.
This commit is contained in:
Christopher Faulet 2021-04-14 14:02:56 +02:00
parent 1d26f22e05
commit 1615064ea0
1 changed files with 8 additions and 3 deletions
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11
Makefile
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@ -123,20 +123,25 @@ ifeq ($V,1)
Q=
endif
# WARNING: Do not change cc-opt, cc-opt-alt or cc-warning without checking if
# clang bug #49364 is fixed. stderr is redirected to /dev/null on
# purpose, to work around a clang 11 bug that crashes if stderr is
# redirected to stdin.
#
# Function used to detect support of a given option by the compiler.
# Usage: CFLAGS += $(call cc-opt,option). Eg: $(call cc-opt,-fwrapv)
# Note: ensure the referencing variable is assigned using ":=" and not "=" to
# call it only once.
cc-opt = $(shell set -e; if $(CC) -Werror $(1) -E -xc - -o /dev/null </dev/null >&0 2>&0; then echo "$(1)"; fi;)
cc-opt = $(shell set -e; if $(CC) -Werror $(1) -E -xc - -o /dev/null </dev/null >&0 2>/dev/null; then echo "$(1)"; fi;)
# same but emits $2 if $1 is not supported
cc-opt-alt = $(shell set -e; if $(CC) -Werror $(1) -E -xc - -o /dev/null </dev/null >&0 2>&0; then echo "$(1)"; else echo "$(2)"; fi;)
cc-opt-alt = $(shell set -e; if $(CC) -Werror $(1) -E -xc - -o /dev/null </dev/null >&0 2>/dev/null; then echo "$(1)"; else echo "$(2)"; 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 $(CC) -Werror -W$(1) -E -xc - -o /dev/null </dev/null >&0 2>&0; then echo "-Wno-$(1)"; fi;)
cc-nowarn = $(shell set -e; if $(CC) -Werror -W$(1) -E -xc - -o /dev/null </dev/null >&0 2>/dev/null; then echo "-Wno-$(1)"; fi;)
#### Installation options.
DESTDIR =