diff --git a/arch/arm/src/arm/Toolchain.defs b/arch/arm/src/arm/Toolchain.defs
index 4a714f1dcea..5e9eee99dcd 100644
--- a/arch/arm/src/arm/Toolchain.defs
+++ b/arch/arm/src/arm/Toolchain.defs
@@ -103,7 +103,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/arm/src/armv6-m/Toolchain.defs b/arch/arm/src/armv6-m/Toolchain.defs
index 876d7fdf649..682850c1230 100644
--- a/arch/arm/src/armv6-m/Toolchain.defs
+++ b/arch/arm/src/armv6-m/Toolchain.defs
@@ -95,7 +95,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/arm/src/armv7-a/Toolchain.defs b/arch/arm/src/armv7-a/Toolchain.defs
index 09cebafd12c..702d4392b65 100644
--- a/arch/arm/src/armv7-a/Toolchain.defs
+++ b/arch/arm/src/armv7-a/Toolchain.defs
@@ -121,7 +121,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/arm/src/armv7-m/Toolchain.defs b/arch/arm/src/armv7-m/Toolchain.defs
index de000116051..43c2205c47c 100644
--- a/arch/arm/src/armv7-m/Toolchain.defs
+++ b/arch/arm/src/armv7-m/Toolchain.defs
@@ -154,7 +154,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/arm/src/armv7-r/Toolchain.defs b/arch/arm/src/armv7-r/Toolchain.defs
index 0c4834f1c56..2db3c8cf328 100644
--- a/arch/arm/src/armv7-r/Toolchain.defs
+++ b/arch/arm/src/armv7-r/Toolchain.defs
@@ -103,7 +103,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/arm/src/armv8-m/Toolchain.defs b/arch/arm/src/armv8-m/Toolchain.defs
index 805a751a472..07c7f7b25cb 100644
--- a/arch/arm/src/armv8-m/Toolchain.defs
+++ b/arch/arm/src/armv8-m/Toolchain.defs
@@ -153,7 +153,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/avr/src/avr/Toolchain.defs b/arch/avr/src/avr/Toolchain.defs
index 8e11c31f742..9816aacdb74 100644
--- a/arch/avr/src/avr/Toolchain.defs
+++ b/arch/avr/src/avr/Toolchain.defs
@@ -126,7 +126,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/avr/src/avr32/Toolchain.defs b/arch/avr/src/avr32/Toolchain.defs
index b277d6a896a..e93de590bc4 100644
--- a/arch/avr/src/avr32/Toolchain.defs
+++ b/arch/avr/src/avr32/Toolchain.defs
@@ -50,7 +50,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/hc/src/Makefile b/arch/hc/src/Makefile
index 1ff59a3799d..c686aee988e 100644
--- a/arch/hc/src/Makefile
+++ b/arch/hc/src/Makefile
@@ -87,7 +87,7 @@ endif
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/mips/src/mips32/Toolchain.defs b/arch/mips/src/mips32/Toolchain.defs
index 712c3c4a6d6..e0c3410448f 100644
--- a/arch/mips/src/mips32/Toolchain.defs
+++ b/arch/mips/src/mips32/Toolchain.defs
@@ -279,7 +279,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/misoc/src/lm32/Toolchain.defs b/arch/misoc/src/lm32/Toolchain.defs
index 5333d347a32..e4ec7e596b1 100644
--- a/arch/misoc/src/lm32/Toolchain.defs
+++ b/arch/misoc/src/lm32/Toolchain.defs
@@ -87,7 +87,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/misoc/src/minerva/Toolchain.defs b/arch/misoc/src/minerva/Toolchain.defs
index 79448674ff5..0c45a4d20d3 100644
--- a/arch/misoc/src/minerva/Toolchain.defs
+++ b/arch/misoc/src/minerva/Toolchain.defs
@@ -41,7 +41,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/or1k/src/mor1kx/Toolchain.defs b/arch/or1k/src/mor1kx/Toolchain.defs
index 8a509e2653b..05a0193a41e 100644
--- a/arch/or1k/src/mor1kx/Toolchain.defs
+++ b/arch/or1k/src/mor1kx/Toolchain.defs
@@ -68,7 +68,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/risc-v/src/common/Toolchain.defs b/arch/risc-v/src/common/Toolchain.defs
index ca62e9f6076..1882c70546c 100644
--- a/arch/risc-v/src/common/Toolchain.defs
+++ b/arch/risc-v/src/common/Toolchain.defs
@@ -129,7 +129,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/x86/src/Makefile b/arch/x86/src/Makefile
index a3556953f29..ab9463ab024 100644
--- a/arch/x86/src/Makefile
+++ b/arch/x86/src/Makefile
@@ -84,7 +84,7 @@ endif
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/x86_64/src/Makefile b/arch/x86_64/src/Makefile
index 3eb9ed5e5f1..01aeee3b40b 100644
--- a/arch/x86_64/src/Makefile
+++ b/arch/x86_64/src/Makefile
@@ -86,7 +86,7 @@ endif
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/xtensa/src/lx6/Toolchain.defs b/arch/xtensa/src/lx6/Toolchain.defs
index 80c82d7811c..3e1e02a880f 100644
--- a/arch/xtensa/src/lx6/Toolchain.defs
+++ b/arch/xtensa/src/lx6/Toolchain.defs
@@ -79,7 +79,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}
diff --git a/arch/xtensa/src/lx7/Toolchain.defs b/arch/xtensa/src/lx7/Toolchain.defs
index 705fa1c557a..e65cc64a199 100644
--- a/arch/xtensa/src/lx7/Toolchain.defs
+++ b/arch/xtensa/src/lx7/Toolchain.defs
@@ -79,7 +79,7 @@ OBJDUMP = $(CROSSDEV)objdump
 
 # Add the builtin library
 
-EXTRA_LIBS := ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
+EXTRA_LIBS = ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libgcc.a}
 
 ifneq ($(CONFIG_LIBM),y)
   EXTRA_LIBS += ${wildcard ${shell $(CC) $(ARCHCPUFLAGS) --print-file-name=libm.a}}