I was compiling C legacy projects using:
gcc (GCC) 4.4.7 20120313
On a RedHat6 environment, pretty old.
Now I’m using:
gcc (GCC) 8.5.0 20210514
On a RedHat8 environment, which is better.
Flags were:
-Wl,-s -m32 -o $@ Wuninitialized -Winit-self -Warray-bounds -ftree-vrp
Only diff is I needed to add ""lm", now:
-Wl,-s -m32 -o $@ Wuninitialized -Winit-self -Warray-bounds -ftree-vrp -lm
Executing the same executable and debugging it using -ggdb3 / -O0 shows:
On the RH6 old env / old exe:
On the RH8 old env / old exe:
Causing major issues in lot of part of our legacy applications.
Do you have any ideas of why the behavior has changed ?
New GlibC is:
(GNU libc) 2.28
Old GlibC was:
(GNU libc) 2.12
Thanks !
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