GNU make version 4.3 introduced a backward-incompatible change. The number sign '#' now should not have preceding backslash in a macro [1]. To make macros with number signs work regardless of make versions, assign the number sign to a variable. [1] https://lwn.net/Articles/810071/ Reported-by: Ziyang Zhang <ZiyangZhang@xxxxxxxxxxxxxxxxx> Link: https://lore.kernel.org/linux-block/cfccc895-5a9b-f45b-5851-74c94219d743@xxxxxxxxxxxxxxxxx/ Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx> --- This patch can be applied on top of Ming Lei's series for miniublk [2]. [2] https://lore.kernel.org/linux-block/20230224124502.1720278-1-ming.lei@xxxxxxxxxx/ src/Makefile | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/Makefile b/src/Makefile index 81c6541..cbb0b25 100644 --- a/src/Makefile +++ b/src/Makefile @@ -1,8 +1,10 @@ -HAVE_C_HEADER = $(shell if echo "\#include <$(1)>" | \ +H := \# + +HAVE_C_HEADER = $(shell if echo "$(H)include <$(1)>" | \ $(CC) -E - > /dev/null 2>&1; then echo "$(2)"; \ else echo "$(3)"; fi) -HAVE_C_MACRO = $(shell if echo "#include <$(1)>" | \ +HAVE_C_MACRO = $(shell if echo "$(H)include <$(1)>" | \ $(CC) -E - 2>&1 /dev/null | grep $(2) > /dev/null 2>&1; \ then echo 1;else echo 0; fi) -- 2.38.1
