fix(ldgen): fix linker script generation from a single-entry fragment file

tools/ci/check_copyright_ignore.txt

@@ -1277,7 +1277,6 @@ tools/test_apps/build_system/embed_test/main/test_main.c
 tools/test_apps/build_system/ldalign_test/main/test_main.c
 tools/test_apps/build_system/ldgen_test/main/src1.c
 tools/test_apps/build_system/ldgen_test/main/src2.c
-tools/test_apps/build_system/ldgen_test/main/test_main.c
 tools/test_apps/peripherals/i2c_wifi/main/i2c_wifi_main.c
 tools/test_apps/protocols/esp_netif/build_config/main/init_macro.h
 tools/test_apps/protocols/esp_netif/build_config/main/main.cpp

tools/ldgen/ldgen/output_commands.py

@@ -59,7 +59,7 @@ class InputSectionDesc:
     Outputs an input section description as described in
     https://www.acrc.bris.ac.uk/acrc/RedHat/rhel-ld-en-4/sections.html#INPUT-SECTION.
 
-    These commands are emmited from mapping fragment entries, specifically attaching
+    These commands are emitted from mapping fragment entries, specifically attaching
     a scheme onto an entity. Mapping fragment flags KEEP, SORT will also affect
     the emitted input section description.
     """
@@ -83,9 +83,10 @@ class InputSectionDesc:
         self.sort = sort
 
     def __str__(self):
-        sections_string = '( )'
+        sections_string = ''
 
         if self.sections:
+            sections_string = '( )'
             exclusion_strings = []
 
             for exc in sorted(self.exclusions):

tools/ldgen/test/test_output_commands.py

@@ -1,9 +1,8 @@
 #!/usr/bin/env python
 #
-# SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+# SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: Apache-2.0
 #
-
 import os
 import sys
 import unittest
@@ -122,14 +121,14 @@ class InputSectionDescTest(unittest.TestCase):
 
     def test_empty_sections(self):
         # Test empty sections
-        expected = '*libfreertos.a:croutine.*( )'
+        expected = '*libfreertos.a:croutine.*'
 
         desc = InputSectionDesc(Entity('libfreertos.a', 'croutine'), [])
         self.assertEqual(expected, str(desc))
 
     def test_keep(self):
         # Test KEEP
-        expected = 'KEEP(*libfreertos.a:croutine.*( ))'
+        expected = 'KEEP(*libfreertos.a:croutine.*)'
 
         desc = InputSectionDesc(Entity('libfreertos.a', 'croutine'), [], keep=True)
         self.assertEqual(expected, str(desc))

tools/test_apps/build_system/ldgen_test/check_placements.py

@@ -66,3 +66,5 @@ if not args.no_rtc:
 check_location('func3', '.flash.text')
 
 check_location('func4', '.iram0.text')
+
+check_location('const_array', '.dram0.data')

tools/test_apps/build_system/ldgen_test/main/CMakeLists.txt

@@ -1,3 +1,3 @@
-idf_component_register(SRCS "src1.c" "src2.c" "test_main.c"
+idf_component_register(SRCS "src1.c" "src2.c" "test_main.c" "consts.c"
                        INCLUDE_DIRS "."
                        LDFRAGMENTS "linker.lf")

tools/test_apps/build_system/ldgen_test/main/consts.c

@@ -0,0 +1,9 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */
+
+const int const_array[] = {
+    10, 20, 30, 40, 50, 60, 70, 80
+};

tools/test_apps/build_system/ldgen_test/main/linker.lf

@@ -7,3 +7,4 @@ entries:
         text->iram0_text KEEP() ALIGN(9) ALIGN(12, post) SURROUND(sym1)
     if SOC_RTC_MEM_SUPPORTED = y:
         src1:func2 (rtc)
+    consts : const_array (noflash)

tools/test_apps/build_system/ldgen_test/main/test_main.c

@@ -1,11 +1,25 @@
+/*
+ * SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: CC0-1.0
+ */
+#include <stdio.h>
+#include "esp_memory_utils.h"
 
 extern void func2(void);
 extern void func3(void);
 extern void func4(void);
 
+extern const int const_array[];
+
 void app_main(void)
 {
     func2();
     func3();
     func4();
+    if (esp_ptr_in_dram(const_array)) {
+        printf("const_array placed in dram\n");
+    } else {
+        printf("const_array NOT placed in dram\n");
+    }
 }