semihost is not working in Nuclei SDK 0.4.1

[fanghuaqi]

When working with Nuclei SDK 0.4.1, build and compile with semihosting library, the semihosting feature is not working as expect.

make STDCLIB=newlib_nano CORE=n300fd SEMIHOST=1 clean all

The program stop at early_exc_entry and no output in openocd console, which is not as expected.

[fanghuaqi]

This is caused by when compile with --specs nano.specs, it will link a libgloss library, which is conflict with the one provided by semihost, we can add -u _isatty -u _write -u _sbrk -u _read -u _close -u _fstat -u _lseek in link options to workaround it.

Author: Huaqi Fang <578567190@qq.com>
Date:   Mon Jun 5 18:36:36 2023 +0800

    Build: Fix semihost not working when link with semihost library

    Signed-off-by: Huaqi Fang <578567190@qq.com>

diff --git a/Build/Makefile.conf b/Build/Makefile.conf
index ab1365e5..f431c9da 100644
--- a/Build/Makefile.conf
+++ b/Build/Makefile.conf
@@ -227,7 +227,7 @@ LDFLAGS += -T $(LINKER_SCRIPT) -nostartfiles -Wl,-Map=$(TARGET).map \
                $(LIB_OPT) -Wl,--start-group $(LDLIBS) -Wl,--end-group

 ifneq ($(findstring newlib,$(STDCLIB)),)
-#LDFLAGS += -u _isatty -u _write -u _sbrk -u _read -u _close -u _fstat -u _lseek
+LDFLAGS += -u _isatty -u _write -u _sbrk -u _read -u _close -u _fstat -u _lseek
 endif

 # Include RTOS and Components Makefiles
diff --git a/SoC/demosoc/Common/npk.yml b/SoC/demosoc/Common/npk.yml
index b543ba46..a45f690b 100644
--- a/SoC/demosoc/Common/npk.yml
+++ b/SoC/demosoc/Common/npk.yml
@@ -412,7 +412,7 @@ buildconfig:
       - flags: -lstdc++
         condition: $( startswith(${stdclib}, "newlib") )
       - flags: -Wl,--gc-sections -Wl,--check-sections
-      - flags: # -u _isatty -u _write -u _sbrk -u _read -u _close -u _fstat -u _lseek
+      - flags: -u _isatty -u _write -u _sbrk -u _read -u _close -u _fstat -u _lseek
         condition: $( startswith(${stdclib}, "newlib") )
       - flags: -Wl,--defsym=__SMP_CPU_CNT=${nuclei_smp}
         condition: $( ${nuclei_smp} > 1 )
diff --git a/SoC/evalsoc/Common/npk.yml b/SoC/evalsoc/Common/npk.yml
index e9fc627e..34cb4cee 100644
--- a/SoC/evalsoc/Common/npk.yml
+++ b/SoC/evalsoc/Common/npk.yml
@@ -412,7 +412,7 @@ buildconfig:
       - flags: -lstdc++
         condition: $( startswith(${stdclib}, "newlib") )
       - flags: -Wl,--gc-sections -Wl,--check-sections
-      - flags: # -u _isatty -u _write -u _sbrk -u _read -u _close -u _fstat -u _lseek
+      - flags: -u _isatty -u _write -u _sbrk -u _read -u _close -u _fstat -u _lseek
         condition: $( startswith(${stdclib}, "newlib") )
       - flags: -Wl,--defsym=__SMP_CPU_CNT=${nuclei_smp}
         condition: $( ${nuclei_smp} > 1 )

[fanghuaqi]

Fixed by commit 493f783fd42296d62dfa08569707b46e6291a773, you can cherry-pick it into master branch.