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188edited Feb 19, 2020 at 9:14Simple assignment :=
A simple assignment expression is evaluated only once, at the very first occurrence. For example, if CC :=${GCC} ${FLAGS} during the first encounter is evaluated to gcc -W then each time ${CC} occurs it will be replaced with gcc -W.
Recursive assignment =
A Recursive assignment expression is evaluated everytime the variable is encountered in the code. For example, a statement like CC = ${GCC} {FLAGS} will be evaluated only when an action like ${CC} file.c is executed. However, if the variable GCC is reassigned i.e GCC=c++ ...
Content Under CC-BY-SA license gnu make - What's the difference between := and = in Makefile?
Jan 6, 2019 · In short, variables defined with := are expanded once, but variables defined with = are expanded whenever they are used. So would it be correct to say that := is more efficient? Or is efficiency not really a factor with Makefiles?
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I suggest you do some experiments using "make". Here is a simple demo, showing the difference between = and :=. /* Filename: Makefile*/ x := foo y := $(x) bar x := later a = foo b = $(a) bar a …
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117047 – [15 regression] Segfault in libgccjit garbage collection …
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