Compilation error with GCC 10

[lmarz]

The program returns a linking error with GCC 10

gcc-10 -pthread -Wall -Wno-unknown-pragmas -g -O2   -o pixz pixz-common.o pixz-cpu.o pixz-endian.o pixz-list.o pixz-pixz.o pixz-read.o pixz-write.o -lm -larchive -llzma  -lm 
/usr/bin/ld: pixz-list.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:58: multiple definition of `gStream'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:58: first defined here
/usr/bin/ld: pixz-list.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: multiple definition of `gOutFile'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: first defined here
/usr/bin/ld: pixz-list.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: multiple definition of `gInFile'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: first defined here
/usr/bin/ld: pixz-pixz.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: multiple definition of `gInFile'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: first defined here
/usr/bin/ld: pixz-pixz.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: multiple definition of `gOutFile'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: first defined here
/usr/bin/ld: pixz-pixz.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:58: multiple definition of `gStream'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:58: first defined here
/usr/bin/ld: pixz-read.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: multiple definition of `gOutFile'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: first defined here
/usr/bin/ld: pixz-read.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: multiple definition of `gInFile'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: first defined here
/usr/bin/ld: pixz-read.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:58: multiple definition of `gStream'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:58: first defined here
/usr/bin/ld: pixz-write.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: multiple definition of `gInFile'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: first defined here
/usr/bin/ld: pixz-write.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:58: multiple definition of `gStream'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:58: first defined here
/usr/bin/ld: pixz-write.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: multiple definition of `gOutFile'; pixz-common.o:/home/leon/Downloads/pixz-1.0.6/src/pixz.h:57: first defined here
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:407: pixz] Error 1
make[2]: Leaving directory '/home/leon/Downloads/pixz-1.0.6/src'
make[1]: *** [Makefile:376: all-recursive] Error 1
make[1]: Leaving directory '/home/leon/Downloads/pixz-1.0.6'
make: *** [Makefile:317: all] Error 2

The problem exists because of some missing extern definition for global variables in pixz.h. It can be fixed with the help of the Porting Guide
There is also a Debian Bug Report addressing this issue: #957689

[vasi]

Thanks for the report, it should be fixed in master. Can you please test?

[lmarz]

It compiled successfully. Thank you very much