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mold/test/elf/ifunc-export.sh
Rui Ueyama e6d4154688 [ELF] Generalize tests
With this change, you can now cross compile test cases and run
them on qemu-user. Here is an example to run our test suits in
an emulated ARM32 environment.

$ CC=arm-linux-gnueabihf-gcc \
  CXX=arm-linux-gnueabihf-g++ \
  GCC=arm-linux-gnueabihf-gcc \
  GXX=arm-linux-gnueabihf-g++ \
  OBJDUMP=arm-linux-gnueabihf-objdump \
  MACHINE=arm \
  QEMU='qemu-arm -L /usr/arm-linux-gnueabihf' \
  make -j16 test
2022-04-02 16:53:41 +08:00

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#!/bin/bash
export LC_ALL=C
set -e
CC="${CC:-cc}"
CXX="${CXX:-c++}"
GCC="${GCC:-gcc}"
GXX="${GXX:-g++}"
OBJDUMP="${OBJDUMP:-objdump}"
MACHINE="${MACHINE:-$(uname -m)}"
testname=$(basename "$0" .sh)
echo -n "Testing $testname ... "
cd "$(dirname "$0")"/../..
mold="$(pwd)/mold"
t=out/test/elf/$testname
mkdir -p $t
# IFUNC is not supported on RISC-V yet
[ $MACHINE = riscv64 ] && { echo skipped; exit; }
# Skip if libc is musl because musl does not support GNU FUNC
echo 'int main() {}' | $CC -o $t/exe -xc -
readelf --dynamic $t/exe | grep -q ld-musl && { echo OK; exit; }
cat <<EOF | $CC -c -fPIC -o $t/a.o -xc -
#include <stdio.h>
__attribute__((ifunc("resolve_foobar")))
void foobar(void);
void real_foobar(void) {
printf("Hello world\n");
}
typedef void Func();
Func *resolve_foobar(void) {
return real_foobar;
}
EOF
$CC -B. -shared -o $t/b.so $t/a.o
readelf --dyn-syms $t/b.so | grep -Eq '(IFUNC|<OS specific>: 10)\s+GLOBAL DEFAULT .* foobar'
echo OK