#3541 SDCC deletes cpp file in compiling and throw an error

[Deqing Sun]

Hi,

I'm tring to update my toolchain to new version but there was a problem. When I tried to compile the project it thrown me some error. I found the following bug:

When I tried to compile the cpp file with a simplified test command with SDCC snapshot build 4.2.12 #13827 (Mac OS X x86_64)

/path_to_sdcc/sdcc -MMD -c -xc ch552_serial1_debug.ino.cpp -o ch552_serial1_debug.ino.cpp.o

I got error

sdcpp: warning: '-x c' after last input file has no effect
cc1: fatal error: ch552_serial1_debug.ino.cpp.d: No such file or directory
compilation terminated.
at 1: warning 190: ISO C forbids an empty source file
subprocess error 256

And the cpp souce file disappears. I believe this is a bug? The file is attached.

[Benedikt Freisen]

Apparently, the "-x c" goes in the wrong place in the synthesized command line for the preprocessor.

[Deqing Sun]

It seems required to have the "-xc" although this comment said not needed https://sourceforge.net/p/sdcc/bugs/3489/#ddcf

But the "-xc" triggered the bug.

[Felix]

This bug does not seem (directly?) related to -xc or sdcpp.

Add --verbose to see the sdcpp command. Now, cpp (from gcc) takes similar
arguments, except --obj-ext=.rel...

Here's a simplified version of the test cast, starting from cpp, to get the
full picture.

$ echo 'int main(){}' > ch552.c
$ cpp -nostdinc -Wall -std=c11 -MMD ch552.d -MT ch552.o ch552.c
cc1: fatal error: ch552.d: No such file or directory
$ cat ch552.c
cat: ch552.c: No such file or directory

adjusting the invocation a bit i get

$ echo 'int main(){}' > ch552.c
$ cpp -nostdinc -Wall -std=c11 ch552.c -MT ch552.o -MMD -MF ch552.d
# 0 "ch552.c"
# 0 "<built-in>"
# 0 "<command-line>"
# 1 "ch552.c"
int main(){}
$ cat ch552.c
int main(){}
$ cat ch552.d
ch552.o: ch552.c

Which is looks much closer to what we want. But then

$ echo 'int main(){}' > ch552.c
$ sdcpp -nostdinc -Wall -std=c11 ch552.c -MT ch552.o -MMD -MF ch552.d
$ cat ch552.c
#line 0 "ch552.d"
#line 0 "<built-in>"
#line 0 "<command-line>"
#line 1 "ch552.d"
ch552.o: ch552.d.

Issue seems to be that -MF is missing in the sdcpp invocation. -MMD does not take arguments (anymore?).

I have fixed this in [r13911].

[Felix]

Appears to be fixed with [r13911]. Please reopen if this is not the case.