@Edoapra, thank you for your help.
I loaded mkl and impi before running the script (although it seems to me it was unnecessary). It looks like the issue is with libgcc.so, I checked on my PATH and I only have libgcc.a or libgcc_s.so
Here's the full output:
GNU ld version 2.23.52.0.1-55.el7 20130226
Supported emulations:
elf_x86_64
elf32_x86_64
elf_i386
i386linux
elf_l1om
elf_k1om
using internal linker script:
==================================================
/* Script for -z combreloc: combine and sort reloc sections */
OUTPUT_FORMAT("elf64-x86-64", "elf64-x86-64",
"elf64-x86-64")
OUTPUT_ARCH(i386:x86-64)
ENTRY(_start)
SEARCH_DIR("/usr/x86_64-redhat-linux/lib64"); SEARCH_DIR("/usr/local/lib64"); SEARCH_DIR("/lib64"); SEARCH_DIR("/usr/lib64"); SEARCH_DIR("/usr/x86_64-redhat-linux/lib"); SEARCH_DIR("/usr/lib64"); SEARCH_DIR("/usr/local/lib"); SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib");
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==================================================
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crt1.o succeeded
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crt1.o
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crti.o succeeded
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crti.o
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/crtbegin.o succeeded
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/crtbegin.o
attempt to open /tmp/ccFhsDpu.o succeeded
/tmp/ccFhsDpu.o
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgfortran.so succeeded
-lgfortran (/usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgfortran.so)
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libm.so failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libm.a failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libm.so succeeded
-lm (/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libm.so)
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc_s.so succeeded
-lgcc_s (/usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc_s.so)
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc.a succeeded
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libquadmath.so succeeded
opened script file /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libquadmath.so
opened script file /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libquadmath.so
attempt to open /usr/lib64/libquadmath.so.0.0.0 succeeded
/usr/lib64/libquadmath.so.0.0.0
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libm.so failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libm.a failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libm.so succeeded
-lm (/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libm.so)
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc_s.so succeeded
-lgcc_s (/usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc_s.so)
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc.a succeeded
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libc.so failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libc.a failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libc.so succeeded
opened script file /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libc.so
opened script file /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/libc.so
attempt to open /lib64/libc.so.6 succeeded
/lib64/libc.so.6
attempt to open /usr/lib64/libc_nonshared.a succeeded
(/usr/lib64/libc_nonshared.a)elf-init.oS
attempt to open /lib64/ld-linux-x86-64.so.2 succeeded
/lib64/ld-linux-x86-64.so.2
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc_s.so succeeded
-lgcc_s (/usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc_s.so)
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc.so failed
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/libgcc.a succeeded
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/crtend.o succeeded
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/crtend.o
attempt to open /usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crtn.o succeeded
/usr/lib/gcc/x86_64-redhat-linux/4.8.5/../../../../lib64/crtn.o
ld-linux-x86-64.so.2 needed by /lib64/libc.so.6
found ld-linux-x86-64.so.2 at /lib64/ld-linux-x86-64.so.2
/tmp/ccFhsDpu.o: In function `MAIN__':
ff.f:(.text+0x6b): undefined reference to `sub_'
collect2: error: ld returned 1 exit status
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