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Fix C11_ATOMIC detection on GNU Make 4.3 (#10033)

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Older version of GNU Make (<4.3) required quoting of number signs (#) to
avoid them being treated as a comment. Newer versions will treat this
quote as a literal.

This issue and a proposed solution is discussed here:
https://lists.gnu.org/archive/html/info-gnu/2020-01/msg00004.html

Co-authored-by: Yossi Gottlieb <yossigo@gmail.com>
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王辉 2022-01-04 20:05:00 +08:00 committed by GitHub
parent ac84b1cd82
commit 747b08bee0
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1 changed files with 4 additions and 2 deletions
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6
src/Makefile
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@ -34,8 +34,10 @@ endif
WARN=-Wall -W -Wno-missing-field-initializers
OPT=$(OPTIMIZATION)
# Detect if the compiler supports C11 _Atomic
C11_ATOMIC := $(shell sh -c 'echo "\#include <stdatomic.h>" > foo.c; \
# Detect if the compiler supports C11 _Atomic.
# NUMBER_SIGN_CHAR is a workaround to support both GNU Make 4.3 and older versions.
NUMBER_SIGN_CHAR := \#
C11_ATOMIC := $(shell sh -c 'echo "$(NUMBER_SIGN_CHAR)include <stdatomic.h>" > foo.c; \
$(CC) -std=c11 -c foo.c -o foo.o > /dev/null 2>&1; \
if [ -f foo.o ]; then echo "yes"; rm foo.o; fi; rm foo.c')
ifeq ($(C11_ATOMIC),yes)