Re: Compiling gcc fails while trying to link libgcc

[Jim Wilson <jimw@sifive.com>]

On Thu, Jul 9, 2020 at 1:51 AM Peter Lamby via Gcc-help
<gcc-help@gcc.gnu.org> wrote:
> export CFLAGS=-pipe -march=native -fstack-protector-strong -fno-plt \
> -pie -fpie

You can't use -pie when linking a shared library.  So this isn't going
to work.  Also the -fno-plt is suspicious.  Can you compile a shared
library without plts?  The -fpie is clearly wrong too.  You need to do
this a different way.  Note that gcc has a configure option
--enable-default-pie which will produce pie output by default, but
won't pass -pie to the linker with -static, -shared, or -r.  And won't
add -fpie if -fpic was specified.

rohan:2242$ gcc -shared -fpic -o tmp.so tmp.c
rohan:2243$ gcc -shared -fpic -o tmp.so tmp.c -pie
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/Scrt1.o: In
function `_start':
(.text+0x20): undefined reference to `main'
collect2: error: ld returned 1 exit status
rohan:2244$

Jim