AIX compiling from source is failing

[XSven]

operating system: AIX 7.3
compiler: gcc 8.3.0
applied build instructions: Building with configure (*nix including GNU/Linux)
error when linking:

...
gcc -std=gnu99 -Wall   -I/opt/freeware/include/libxml2 -I/opt/freeware/include     -g -O2   -o ctags  main/ctags-cmd.o libctags.a gnulib/libgnu.a -pthread -L/opt/freeware/lib64 -lxml2    -liconv
ld: 0711-317 ERROR: Undefined symbol: ._isnan
ld: 0711-345 Use the -bloadmap or -bnoquiet option to obtain more information.
collect2: error: ld returned 8 exit status
...

solution:

LIBS=-lm ./configure 

question: any idea how this additional LIBS environment configuration can be avoided?

[leleliu008]

@XSven Thank you for your report. It seems that the contributor (#3746) forgot to check whether libm should be linked or not. I have filed a PR (#3808) to fix this.