__builtin_bswap32 ambiguous

[ErwinOudG]

Basic Infos

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

Platform

• Hardware: esp8266 [ESP-12|ESP-01|ESP-07|ESP8285 device|other]
• Core Version: 2.4.1 [latest git hash or date]
• Development Env: [Arduino IDE]
• Operating System: [Windows]

Settings in IDE

• Module: [Wemos D1 mini Pro]
• Flash Mode: [qio|dio|other]
• Flash Size: [16M (15M SPIFFS)]
• lwip Variant: [|v2 Lower Memory]
• Reset Method: [
• Flash Frequency: [
• CPU Frequency: [80Mhz|]
• Upload Using: [SERIAL]
• Upload Speed: [115200|] (serial upload only)

Problem Description

this sketch doesn't compile
if i use __builtin_bswap16 instead of __builtin_bswap32, it compiles right

MCVE Sketch

#include <Arduino.h>

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

}


void loop() {
  // put your main code here, to run repeatedly:
  long Serienr = 805540324;
  Serial.print("serienr: ");
  Serial.println(Serienr, HEX);
  Serial.print("rneires: ");
  Serial.println(__builtin_bswap32(Serienr), HEX);
  delay(10000);
}

Debug Messages

Arduino: 1.8.5 (Windows 10), Board: "WeMos D1 mini Pro, 80 MHz, 16M (15M SPIFFS), v2 Lower Memory, Disabled, TLS_MEM, Only Sketch, 115200"

C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\User\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\User\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries D:\Company\Arduino software\libraries -fqbn=esp8266:esp8266:d1_mini_pro:CpuFrequency=80,FlashSize=16M15M,LwIPVariant=v2mss536,Debug=Disabled,DebugLevel=TLS_MEM,FlashErase=none,UploadSpeed=115200 -ide-version=10805 -build-path C:\Users\User\AppData\Local\Temp\arduino_build_788951 -warnings=all -build-cache C:\Users\User\AppData\Local\Temp\arduino_cache_279966 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.xtensa-lx106-elf-gcc.path=C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2 -prefs=runtime.tools.mkspiffs.path=C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\mkspiffs\0.2.0 -prefs=runtime.tools.esptool.path=C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\esptool\0.4.13 -verbose D:\Company\Arduino software\esp8266issue\esp8266issue.ino
C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -hardware C:\Users\User\AppData\Local\Arduino15\packages -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -tools C:\Users\User\AppData\Local\Arduino15\packages -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries D:\Company\Arduino software\libraries -fqbn=esp8266:esp8266:d1_mini_pro:CpuFrequency=80,FlashSize=16M15M,LwIPVariant=v2mss536,Debug=Disabled,DebugLevel=TLS_MEM,FlashErase=none,UploadSpeed=115200 -ide-version=10805 -build-path C:\Users\User\AppData\Local\Temp\arduino_build_788951 -warnings=all -build-cache C:\Users\User\AppData\Local\Temp\arduino_cache_279966 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.xtensa-lx106-elf-gcc.path=C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2 -prefs=runtime.tools.mkspiffs.path=C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\mkspiffs\0.2.0 -prefs=runtime.tools.esptool.path=C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\esptool\0.4.13 -verbose D:\Company\Arduino software\esp8266issue\esp8266issue.ino
Using board 'd1_mini_pro' from platform in folder: C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1
Using core 'esp8266' from platform in folder: C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1
Build options changed, rebuilding all
Detecting libraries used...
"C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/include" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/lwip2/include" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/libc/xtensa-lx106-elf/include" "-IC:\Users\User\AppData\Local\Temp\arduino_build_788951/core" -c -w -Os -g -mlongcalls -mtext-section-literals -fno-exceptions -fno-rtti -falign-functions=4 -std=c++11  -ffunction-sections -fdata-sections -w -x c++ -E -CC -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536  -DDEBUG_ESP_TLS_MEM -DARDUINO=10805 -DARDUINO_ESP8266_WEMOS_D1MINIPRO -DARDUINO_ARCH_ESP8266 -DARDUINO_BOARD="ESP8266_WEMOS_D1MINIPRO"   -DESP8266 "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\variants\d1_mini" "C:\Users\User\AppData\Local\Temp\arduino_build_788951\sketch\esp8266issue.ino.cpp" -o "nul"
Generating function prototypes...
"C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/include" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/lwip2/include" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/libc/xtensa-lx106-elf/include" "-IC:\Users\User\AppData\Local\Temp\arduino_build_788951/core" -c -w -Os -g -mlongcalls -mtext-section-literals -fno-exceptions -fno-rtti -falign-functions=4 -std=c++11  -ffunction-sections -fdata-sections -w -x c++ -E -CC -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536  -DDEBUG_ESP_TLS_MEM -DARDUINO=10805 -DARDUINO_ESP8266_WEMOS_D1MINIPRO -DARDUINO_ARCH_ESP8266 -DARDUINO_BOARD="ESP8266_WEMOS_D1MINIPRO"   -DESP8266 "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\variants\d1_mini" "C:\Users\User\AppData\Local\Temp\arduino_build_788951\sketch\esp8266issue.ino.cpp" -o "C:\Users\User\AppData\Local\Temp\arduino_build_788951\preproc\ctags_target_for_gcc_minus_e.cpp"
"C:\Program Files (x86)\Arduino\tools-builder\ctags\5.8-arduino11/ctags" -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives "C:\Users\User\AppData\Local\Temp\arduino_build_788951\preproc\ctags_target_for_gcc_minus_e.cpp"
Compiling sketch...
"C:\Users\User\AppData\Local\Arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\1.20.0-26-gb404fb9-2/bin/xtensa-lx106-elf-g++" -D__ets__ -DICACHE_FLASH -U__STRICT_ANSI__ "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/include" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/lwip2/include" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1/tools/sdk/libc/xtensa-lx106-elf/include" "-IC:\Users\User\AppData\Local\Temp\arduino_build_788951/core" -c -Wall -Wextra -Os -g -mlongcalls -mtext-section-literals -fno-exceptions -fno-rtti -falign-functions=4 -std=c++11 -MMD -ffunction-sections -fdata-sections -DF_CPU=80000000L -DLWIP_OPEN_SRC -DTCP_MSS=536  -DDEBUG_ESP_TLS_MEM -DARDUINO=10805 -DARDUINO_ESP8266_WEMOS_D1MINIPRO -DARDUINO_ARCH_ESP8266 -DARDUINO_BOARD="ESP8266_WEMOS_D1MINIPRO"   -DESP8266 "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266" "-IC:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\variants\d1_mini" "C:\Users\User\AppData\Local\Temp\arduino_build_788951\sketch\esp8266issue.ino.cpp" -o "C:\Users\User\AppData\Local\Temp\arduino_build_788951\sketch\esp8266issue.ino.cpp.o"
D:\Company\Arduino software\esp8266issue\esp8266issue.ino: In function 'void loop()':

esp8266issue:14: error: call of overloaded 'println(unsigned int, int)' is ambiguous

   Serial.println(__builtin_bswap32(Serienr), HEX);

                                                 ^

D:\Company\Arduino software\esp8266issue\esp8266issue.ino:14:49: note: candidates are:

In file included from C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/Stream.h:26:0,

                 from C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/HardwareSerial.h:31,

                 from C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/Arduino.h:260,

                 from C:\Users\User\AppData\Local\Temp\arduino_build_788951\sketch\esp8266issue.ino.cpp:1:

C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/Print.h:84:16: note: size_t Print::println(unsigned char, int)

         size_t println(unsigned char, int = DEC);

                ^

C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/Print.h:85:16: note: size_t Print::println(int, int)

         size_t println(int, int = DEC);

                ^

C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/Print.h:86:16: note: size_t Print::println(unsigned int, int)

         size_t println(unsigned int, int = DEC);

                ^

C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/Print.h:87:16: note: size_t Print::println(long int, int)

         size_t println(long, int = DEC);

                ^

C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/Print.h:88:16: note: size_t Print::println(long unsigned int, int)

         size_t println(unsigned long, int = DEC);

                ^

C:\Users\User\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.4.1\cores\esp8266/Print.h:89:16: note: size_t Print::println(double, int)

         size_t println(double, int = 2);

                ^

exit status 1
call of overloaded 'println(unsigned int, int)' is ambiguous

[earlephilhower]

You have to tell the compiler what you're trying to print via casting, since there is no uint32_t println method. Add (long unsigned) if you want a 32-bit output.

#include <Arduino.h>

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);

}


void loop() {
  // put your main code here, to run repeatedly:
  long Serienr = 805540324;
  Serial.print("serienr: ");
  Serial.println(Serienr, HEX);
  Serial.print("rneires: ");
  Serial.println((long unsigned)__builtin_bswap32(Serienr), HEX);
  delay(10000);
}

Outputs

serienr: 300391E4
rneires: E4910330