Basic Infos

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

Platform

• Hardware: [other (ESP-12 compatible)] (AE-ESP-WROOM-02: see https://akizukidenshi.com/catalog/g/gK-09758/)
• Core Version: [bf6f3e7]
• Development Env: [Arduino IDE]
• Operating System: [Windows]

Settings in IDE

• Module: [Generic ESP8266 Module]
• Flash Mode: [qio]
• Flash Size: [4MB]
• lwip Variant: [v2 Lower Memory]
• Reset Method: [nodemcu]
• Flash Frequency: [80Mhz]
• CPU Frequency: [160MHz]
• Upload Using: [SERIAL]
• Upload Speed: [115200]

Problem Description

pgm_read_float_unaligned() in 'tools/xtensa-lx106-elf/xtensa-lx106-elf/include/sys/pgmspace.h' should use pgm_read_dword_with_offset() instead of pgm_read_with_offset(), as per pgm_read_dword_unaligned().

MCVE Sketch

void setup() {
  // put your setup code here, to run once:

  static const float SPECIMEN = 3.14159265359F;
  static uint8_t __attribute__((aligned(4))) buffer[8];
  memset(buffer, 0, sizeof(buffer));

  uint8_t* unaligned_location = &buffer[1];
  memcpy(unaligned_location, &SPECIMEN, sizeof(SPECIMEN));

  Serial.begin(115200);
  Serial.print("\n\n"
               "** pgm_read_float_unaligned() test **\n"
               "specimen: ");
  Serial.println(SPECIMEN, 6);
  Serial.print("readout:  ");
  Serial.println(pgm_read_float_unaligned(unaligned_location), 6);
}

void loop() {
  // put your main code here, to run repeatedly:

}

Debug Messages

** pgm_read_float_unaligned() test **
specimen: 3.141593
readout:  0.000000

With the abovementioned way,

** pgm_read_float_unaligned() test **
specimen: 3.141593
readout:  3.141593