From da6662c79325812950abe902b62994f91dd183cd Mon Sep 17 00:00:00 2001
From: Mason Tran <mason@lmnotran.com>
Date: Wed, 2 Dec 2020 16:57:46 -0500
Subject: [PATCH] [efr32] remove -nostartfiles to use Newlib _start (#5905)

Remove -nostartfiles. There's currently no custom __START defined
anywhere.

Remove -D__STARTUP_CLEAR_BSS for silabs. Standard initialization
should already take care of this.
---
 examples/Makefile-efr32mg1     | 2 --
 examples/Makefile-efr32mg12    | 2 --
 examples/Makefile-efr32mg13    | 2 --
 examples/Makefile-efr32mg21    | 2 --
 third_party/silabs/Makefile.am | 1 -
 5 files changed, 9 deletions(-)

diff --git a/examples/Makefile-efr32mg1 b/examples/Makefile-efr32mg1
index d1a612b0a54..4fc7590f9f7 100644
--- a/examples/Makefile-efr32mg1
+++ b/examples/Makefile-efr32mg1
@@ -96,7 +96,6 @@ COMMONCFLAGS                       := \
     -Os                               \
     -g                                \
     -I$(HAL_CONF_DIR)                 \
-    -D__START=main                    \
     -D$(MCU)                          \
     $(EFR32_CONFIG_FILE_CPPFLAGS)     \
     $(NULL)
@@ -138,7 +137,6 @@ CXXFLAGS                       += \
 LDFLAGS                        += \
     $(COMMONCFLAGS)               \
     $(target_LDFLAGS)             \
-    -nostartfiles                 \
     -specs=nano.specs             \
     -specs=nosys.specs            \
     -Wl,--gc-sections             \
diff --git a/examples/Makefile-efr32mg12 b/examples/Makefile-efr32mg12
index 744c0ebfcfd..02a8d3b328e 100644
--- a/examples/Makefile-efr32mg12
+++ b/examples/Makefile-efr32mg12
@@ -114,7 +114,6 @@ COMMONCFLAGS                       := \
     -Os                               \
     -g                                \
     -I$(HAL_CONF_DIR)                 \
-    -D__START=main                    \
     -D$(MCU)                          \
     $(EFR32_CONFIG_FILE_CPPFLAGS)     \
     $(NULL)
@@ -156,7 +155,6 @@ CXXFLAGS                       += \
 LDFLAGS                        += \
     $(COMMONCFLAGS)               \
     $(target_LDFLAGS)             \
-    -nostartfiles                 \
     -specs=nano.specs             \
     -specs=nosys.specs            \
     -Wl,--gc-sections             \
diff --git a/examples/Makefile-efr32mg13 b/examples/Makefile-efr32mg13
index 6463e64b8db..00828d9cf64 100644
--- a/examples/Makefile-efr32mg13
+++ b/examples/Makefile-efr32mg13
@@ -100,7 +100,6 @@ COMMONCFLAGS                       := \
     -Os                               \
     -g                                \
     -I$(HAL_CONF_DIR)                 \
-    -D__START=main                    \
     -D$(MCU)                          \
     $(EFR32_CONFIG_FILE_CPPFLAGS)     \
     $(NULL)
@@ -142,7 +141,6 @@ CXXFLAGS                       += \
 LDFLAGS                        += \
     $(COMMONCFLAGS)               \
     $(target_LDFLAGS)             \
-    -nostartfiles                 \
     -specs=nano.specs             \
     -specs=nosys.specs            \
     -Wl,--gc-sections             \
diff --git a/examples/Makefile-efr32mg21 b/examples/Makefile-efr32mg21
index 161e66ee669..c2987aa33fd 100644
--- a/examples/Makefile-efr32mg21
+++ b/examples/Makefile-efr32mg21
@@ -106,7 +106,6 @@ COMMONCFLAGS                       := \
     -Os                               \
     -g                                \
     -I$(HAL_CONF_DIR)                 \
-    -D__START=main                    \
     -D$(MCU)                          \
     $(EFR32_CONFIG_FILE_CPPFLAGS)     \
     $(NULL)
@@ -148,7 +147,6 @@ CXXFLAGS                       += \
 LDFLAGS                        += \
     $(COMMONCFLAGS)               \
     $(target_LDFLAGS)             \
-    -nostartfiles                 \
     -specs=nano.specs             \
     -specs=nosys.specs            \
     -Wl,--gc-sections             \
diff --git a/third_party/silabs/Makefile.am b/third_party/silabs/Makefile.am
index 5825b2228a7..1a483045202 100644
--- a/third_party/silabs/Makefile.am
+++ b/third_party/silabs/Makefile.am
@@ -165,7 +165,6 @@ libsilabs_mbedtls_a_SOURCES                                                   =
 # =============================================================================
 
 COMMONCPPFLAGS                                                                = \
-    -D__STARTUP_CLEAR_BSS                                                       \
     -I$(srcdir)                                                                 \
     -I$(top_srcdir)/include                                                     \
     -I$(top_srcdir)/src/core                                                    \