From aa98fe487dbed80b3ffe425dfed6e656f958f6dd Mon Sep 17 00:00:00 2001
From: Will Tatam <will@netmindz.net>
Date: Wed, 5 Aug 2026 19:22:41 +0100
Subject: [PATCH] Update to IDF 5.5.4

---
 platformio.ini                         | 5 +++--
 wled00/mbedtls_sha1_shim.cpp           | 5 +++--
 wled00/src/dependencies/time/TimeLib.h | 2 +-
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/platformio.ini b/platformio.ini
index 8a060ba0fe..9757f822b3 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -319,8 +319,8 @@ lib_deps =
 lib_ignore = 
 
 [esp32_idf_V5]
-;; build environment for ESP32 using ESP-IDF 5.3.4 / arduino-esp32 v3.1.10
-platform = https://github.com/tasmota/platform-espressif32/releases/download/2026.02.30/platform-espressif32.zip
+;; Platform 2026.05.50 Tasmota Arduino Core 3.3.8.260506 based on IDF 5.5.4.260407
+platform = https://github.com/tasmota/platform-espressif32/releases/download/2026.05.50/platform-espressif32.zip
 platform_packages =
 build_unflags = ${common.build_unflags}
   -Wno-volatile ;; avoid warning on .c files: "-Wno-volatile only applies to c++ files"
@@ -331,6 +331,7 @@ build_flags = -g
   ; -DESP32=ESP32 ;; disabled to avoid compiler warning: "ESP32" redefined
   ${esp32_all_variants.build_flags}
   -D WLED_USE_SHARED_RMT     ;; ToDO: check if NeoESP32RmtHI is still needed with V5 (see discussion in PR#4838)
+  -D__unreachable=__builtin_unreachable ;; picolibc (new toolchain-xtensa-esp-elf) dropped __unreachable(), but esp_dmx still calls it
   ;;-D WLED_DISABLE_INFRARED ;; ToDO: needs more testing with V5
   ;;-D WLED_DISABLE_MQTT     ;; ToDO: needs more testing with V5
   -D WLED_ENABLE_DMX_INPUT
diff --git a/wled00/mbedtls_sha1_shim.cpp b/wled00/mbedtls_sha1_shim.cpp
index a009553bee..e6882ea48b 100644
--- a/wled00/mbedtls_sha1_shim.cpp
+++ b/wled00/mbedtls_sha1_shim.cpp
@@ -1,8 +1,9 @@
 #include "wled.h"
 #ifdef ESP32
-// ESP32-C5 on pioarduino uses IDF 5.5+ which has SHA1 built-in, skip shim
-#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 2, 0) && ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 5, 0)
 #include "mbedtls/sha1.h"
+// Some ESP-IDF builds/platforms compile mbedtls without SHA1 support (MBEDTLS_SHA1_C undefined),
+// while others (e.g. ESP32-C5 on pioarduino) have it built-in. Only provide the shim when missing.
+#if !defined(MBEDTLS_SHA1_C)
 #include "SHA1Builder.h"
 
 // Wrapper functions to map mbedtls SHA1 calls to Arduino SHA1Builder
diff --git a/wled00/src/dependencies/time/TimeLib.h b/wled00/src/dependencies/time/TimeLib.h
index 5004f07165..0270d9b88b 100644
--- a/wled00/src/dependencies/time/TimeLib.h
+++ b/wled00/src/dependencies/time/TimeLib.h
@@ -17,7 +17,7 @@
 #endif
 
 
-#if !defined(__time_t_defined) // avoid conflict with newlib or other posix libc
+#if !defined(__time_t_defined) && !defined(_TIME_T_DECLARED) // avoid conflict with newlib, picolibc, or other posix libc
 typedef unsigned long time_t;
 #endif