-finstrument-functions linking error on Apple clang

[paranlee]

We want to solve the -finstrument-functions linking error.
Even If When we do -finstrument-functions compiler option on basic hello world program. :)

clang -O0 -ggdb -finstrument-functions -v main.c -o HelloMac

ld: Undefined symbols:
  ___cyg_profile_func_enter, referenced from:
      _func2 in main-7eb0ac.o
      _func1 in main-7eb0ac.o
      _main in main-7eb0ac.o
  ___cyg_profile_func_exit, referenced from:
      _func2 in main-7eb0ac.o
      _func1 in main-7eb0ac.o
      _main in main-7eb0ac.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)
...

This issue emerged from some PoC on uftrace project.

• Apple OSX Support namhyung/uftrace#1861

$ uname -a

Darwin gimyunscBookAir 23.2.0 Darwin Kernel Version 23.2.0: Wed Nov 15 21:59:33 PST 2023; root:xnu-10002.61.3~2/RELEASE_ARM64_T8112 arm64
gimyunscBookAir:HelloMac yunseong$ clang -v
Apple clang version 15.0.0 (clang-1500.1.0.2.5)
Target: arm64-apple-darwin23.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
gimyunscBookAir:HelloMac yunseong$ history | grep ktrace
  488  sudo ktrace trace -S -f C3 -c clang -O0 -ggdb -finstrument-functions -v main.c -o HelloMac
  616  history | grep ktrace

$ sudo ktrace trace -S -f C3 -c clang -O0 -ggdb -finstrument-functions -v main.c -o HelloMac

Launching 'clang -O0 -ggdb -finstrument-functions -v main.c -o HelloMac'
walltime                          delta(us)(duration)    debug-id                             arg1             arg2             arg3             arg4             thread-id        cpu  process-name(pid)                             

Apple clang version 15.0.0 (clang-1500.1.0.2.5)
Target: arm64-apple-darwin23.2.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
 "/Library/Developer/CommandLineTools/usr/bin/clang" -cc1 -triple arm64-apple-macosx14.0.0 -Wundef-prefix=TARGET_OS_ -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -Werror=implicit-function-declaration -emit-obj -mrelax-all --mrelax-relocations -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name main.c -mrelocation-model pic -pic-level 2 -mframe-pointer=non-leaf -fno-strict-return -ffp-contract=on -fno-rounding-math -funwind-tables=1 -fobjc-msgsend-selector-stubs -target-sdk-version=14.2 -fvisibility-inlines-hidden-static-local-var -target-cpu apple-m1 -target-feature +v8.5a -target-feature +crc -target-feature +lse -target-feature +rdm -target-feature +crypto -target-feature +dotprod -target-feature +fp-armv8 -target-feature +neon -target-feature +fp16fml -target-feature +ras -target-feature +rcpc -target-feature +zcm -target-feature +zcz -target-feature +fullfp16 -target-feature +sm4 -target-feature +sha3 -target-feature +sha2 -target-feature +aes -target-abi darwinpcs -mllvm -treat-scalable-fixed-error-as-warning -debug-info-kind=standalone -dwarf-version=4 -debugger-tuning=gdb -target-linker-version 1022.1 -v -finstrument-functions -fcoverage-compilation-dir=/Users/yunseong/Desktop/cpp-project/HelloMac/HelloMac -resource-dir /Library/Developer/CommandLineTools/usr/lib/clang/15.0.0 -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I/usr/local/include -internal-isystem /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/local/include -internal-isystem /Library/Developer/CommandLineTools/usr/lib/clang/15.0.0/include -internal-externc-isystem /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include -internal-externc-isystem /Library/Developer/CommandLineTools/usr/include -O0 -Wno-reorder-init-list -Wno-implicit-int-float-conversion -Wno-c99-designator -Wno-final-dtor-non-final-class -Wno-extra-semi-stmt -Wno-misleading-indentation -Wno-quoted-include-in-framework-header -Wno-implicit-fallthrough -Wno-enum-enum-conversion -Wno-enum-float-conversion -Wno-elaborated-enum-base -Wno-reserved-identifier -Wno-gnu-folding-constant -fdebug-compilation-dir=/Users/yunseong/Desktop/cpp-project/HelloMac/HelloMac -ferror-limit 19 -stack-protector 1 -fstack-check -mdarwin-stkchk-strong-link -fblocks -fencode-extended-block-signature -fregister-global-dtors-with-atexit -fgnuc-version=4.2.1 -fmax-type-align=16 -fcommon -fcolor-diagnostics -clang-vendor-feature=+disableNonDependentMemberExprInCurrentInstantiation -fno-odr-hash-protocols -clang-vendor-feature=+enableAggressiveVLAFolding -clang-vendor-feature=+revert09abecef7bbf -clang-vendor-feature=+thisNoAlignAttr -clang-vendor-feature=+thisNoNullAttr -mllvm -disable-aligned-alloc-awareness=1 -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/main-7eb0ac.o -x c main.c
clang -cc1 version 15.0.0 (clang-1500.1.0.2.5) default target arm64-apple-darwin23.2.0
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/local/include"
ignoring nonexistent directory "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
 /Library/Developer/CommandLineTools/usr/lib/clang/15.0.0/include
 /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include
 /Library/Developer/CommandLineTools/usr/include
 /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks (framework directory)
End of search list.
 "/Library/Developer/CommandLineTools/usr/bin/ld" -demangle -lto_library /Library/Developer/CommandLineTools/usr/lib/libLTO.dylib -no_deduplicate -dynamic -arch arm64 -platform_version macos 14.0.0 14.2 -syslibroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -O0 -o HelloMac -L/usr/local/lib /var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/T/main-7eb0ac.o -lSystem /Library/Developer/CommandLineTools/usr/lib/clang/15.0.0/lib/darwin/libclang_rt.osx.a
ld: Undefined symbols:
  ___cyg_profile_func_enter, referenced from:
      _func2 in main-7eb0ac.o
      _func1 in main-7eb0ac.o
      _main in main-7eb0ac.o
  ___cyg_profile_func_exit, referenced from:
      _func2 in main-7eb0ac.o
      _func1 in main-7eb0ac.o
      _main in main-7eb0ac.o
clang: error: linker command failed with exit code 1 (use -v to see invocation)
...

There are the log message by the ktrace. I want to see the library we are looking for.

• ld-error.txt