diff --git a/arch/avr/src/avr/Toolchain.defs b/arch/avr/src/avr/Toolchain.defs
index 6bf844f56f0..994e1fd46fd 100644
--- a/arch/avr/src/avr/Toolchain.defs
+++ b/arch/avr/src/avr/Toolchain.defs
@@ -215,5 +215,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/avr/src/avr32/Toolchain.defs b/arch/avr/src/avr32/Toolchain.defs
index f8c9abda392..7388b8ea4e7 100644
--- a/arch/avr/src/avr32/Toolchain.defs
+++ b/arch/avr/src/avr32/Toolchain.defs
@@ -111,5 +111,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/ceva/src/xc5/Toolchain.defs b/arch/ceva/src/xc5/Toolchain.defs
index 7852e9aec77..047a83cd10d 100644
--- a/arch/ceva/src/xc5/Toolchain.defs
+++ b/arch/ceva/src/xc5/Toolchain.defs
@@ -99,5 +99,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/ceva/src/xm6/Toolchain.defs b/arch/ceva/src/xm6/Toolchain.defs
index 2768a158b37..3238df707c0 100644
--- a/arch/ceva/src/xm6/Toolchain.defs
+++ b/arch/ceva/src/xm6/Toolchain.defs
@@ -104,5 +104,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/mips/src/mips32/Toolchain.defs b/arch/mips/src/mips32/Toolchain.defs
index 96bc3656826..b103d66f013 100644
--- a/arch/mips/src/mips32/Toolchain.defs
+++ b/arch/mips/src/mips32/Toolchain.defs
@@ -326,5 +326,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/misoc/src/lm32/Toolchain.defs b/arch/misoc/src/lm32/Toolchain.defs
index 909b847969f..c81a98bd125 100644
--- a/arch/misoc/src/lm32/Toolchain.defs
+++ b/arch/misoc/src/lm32/Toolchain.defs
@@ -142,5 +142,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/misoc/src/minerva/Toolchain.defs b/arch/misoc/src/minerva/Toolchain.defs
index 6d3201a8f9e..2ea9bb13b62 100644
--- a/arch/misoc/src/minerva/Toolchain.defs
+++ b/arch/misoc/src/minerva/Toolchain.defs
@@ -90,5 +90,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/or1k/src/mor1kx/Toolchain.defs b/arch/or1k/src/mor1kx/Toolchain.defs
index fdbb20800ae..ffc8adbb6f5 100644
--- a/arch/or1k/src/mor1kx/Toolchain.defs
+++ b/arch/or1k/src/mor1kx/Toolchain.defs
@@ -128,5 +128,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/sparc/src/sparc_v8/Toolchain.defs b/arch/sparc/src/sparc_v8/Toolchain.defs
index e98e19e2578..9ec57660242 100644
--- a/arch/sparc/src/sparc_v8/Toolchain.defs
+++ b/arch/sparc/src/sparc_v8/Toolchain.defs
@@ -137,5 +137,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/tricore/src/common/ToolchainTasking.defs b/arch/tricore/src/common/ToolchainTasking.defs
index d01f5292217..9ea13cc3ca1 100644
--- a/arch/tricore/src/common/ToolchainTasking.defs
+++ b/arch/tricore/src/common/ToolchainTasking.defs
@@ -151,5 +151,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/x86/src/common/Toolchain.defs b/arch/x86/src/common/Toolchain.defs
index 7892d9b9a09..4604c3d586f 100644
--- a/arch/x86/src/common/Toolchain.defs
+++ b/arch/x86/src/common/Toolchain.defs
@@ -101,5 +101,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/z80/src/ez80/Toolchain.defs b/arch/z80/src/ez80/Toolchain.defs
index 3e7fd32285f..d75553510dd 100644
--- a/arch/z80/src/ez80/Toolchain.defs
+++ b/arch/z80/src/ez80/Toolchain.defs
@@ -223,5 +223,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/z80/src/z180/Toolchain.defs b/arch/z80/src/z180/Toolchain.defs
index b1d681ce0a3..613bbe10fe6 100644
--- a/arch/z80/src/z180/Toolchain.defs
+++ b/arch/z80/src/z180/Toolchain.defs
@@ -121,5 +121,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/z80/src/z8/Toolchain.defs b/arch/z80/src/z8/Toolchain.defs
index bea30decf4e..52837c6a19d 100644
--- a/arch/z80/src/z8/Toolchain.defs
+++ b/arch/z80/src/z8/Toolchain.defs
@@ -145,5 +145,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
diff --git a/arch/z80/src/z80/Toolchain.defs b/arch/z80/src/z80/Toolchain.defs
index 12d0c4bc02f..099a82934ab 100644
--- a/arch/z80/src/z80/Toolchain.defs
+++ b/arch/z80/src/z80/Toolchain.defs
@@ -121,5 +121,5 @@ LDMODULEFLAGS = -r -T $(call CONVERT_PATH,$(TOPDIR)/libs/libc/elf/gnu-elf.ld)
 CELFFLAGS = $(CFLAGS) -fvisibility=hidden
 CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
 
-LDELFFLAGS = -r -e __start
+LDELFFLAGS = -r -e _start
 LDELFFLAGS += -T $(call CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)