nuttx/sim: Remove math.h in sim.

The reason for removing math.h is that undefining __GLIBC__ does not take effect. By default, sim will use the toolchain's math library and undef __GLIBC__ in the source file.

Signed-off-by: cuiziwei <cuiziwei@xiaomi.com>

boards/sim/sim/sim/configs/libcxxtest/defconfig

@@ -10,7 +10,6 @@ CONFIG_ARCH="sim"
 CONFIG_ARCH_BOARD="sim"
 CONFIG_ARCH_BOARD_SIM=y
 CONFIG_ARCH_CHIP="sim"
-CONFIG_ARCH_MATH_H=y
 CONFIG_ARCH_SIM=y
 CONFIG_BOARDCTL_APP_SYMTAB=y
 CONFIG_BOARDCTL_POWEROFF=y

libs/libxx/0001-Fix-build-error-about-__GLIBC__.patch

@@ -0,0 +1,17 @@
+diff --git libcxx/src/locale.cpp libcxx/src/locale.cpp
+--- libcxx/src/locale.cpp
++++ libcxx/src/locale.cpp
+@@ -41,6 +41,10 @@
+ #include "include/atomic_support.h"
+ #include "include/sso_allocator.h"
+
++#if defined(__NuttX__) && defined(__GLIBC__)
++#   undef __GLIBC__
++#endif
++
+ // On Linux, wint_t and wchar_t have different signed-ness, and this causes
+ // lots of noise in the build log, but no bugs that I know of.
+ _LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wsign-conversion")
+--
+2.34.1
+

libs/libxx/libcxx.cmake

@@ -49,7 +49,9 @@ if(NOT EXISTS ${CMAKE_CURRENT_LIST_DIR}/libcxx)
       ${CMAKE_CURRENT_LIST_DIR}/libcxx <
       ${CMAKE_CURRENT_LIST_DIR}/0001-libcxx-remove-mach-time-h.patch && patch
       -p1 -d ${CMAKE_CURRENT_LIST_DIR}/libcxx <
-      ${CMAKE_CURRENT_LIST_DIR}/0001-libcxx-fix-ld-errors.patch
+      ${CMAKE_CURRENT_LIST_DIR}/0001-libcxx-fix-ld-errors.patch && patch -p1 -d
+      ${CMAKE_CURRENT_LIST_DIR}/libcxx <
+      ${CMAKE_CURRENT_LIST_DIR}/0001-Fix-build-error-about-__GLIBC__.patch
     DOWNLOAD_NO_PROGRESS true
     TIMEOUT 30)
 

libs/libxx/libcxx.defs

@@ -35,6 +35,7 @@ libcxx: libcxx-$(LIBCXX_VERSION).src.tar.xz
 	$(Q) patch -p2 < mbstate_t.patch
 	$(Q) patch -p0 < 0001-libcxx-remove-mach-time-h.patch
 	$(Q) patch -p0 < 0001-libcxx-fix-ld-errors.patch
+	$(Q) patch -p0 < 0001-Fix-build-error-about-__GLIBC__.patch
 	$(Q) touch $@
 endif