Toolchain: Allow building using CMake on macOS

Author: https://github.com/Pagghiu 🔰
Commit: https://github.com/SerenityOS/serenity/commit/a1e1aa96fbd
Pull-request: https://github.com/SerenityOS/serenity/pull/2750
Reviewed-by: https://github.com/ADKaster
Reviewed-by: https://github.com/bugaevc

CMakeLists.txt

@@ -126,6 +126,22 @@ set(CMAKE_RANLIB ${TOOLCHAIN_PREFIX}ranlib)
 set(CMAKE_STRIP ${TOOLCHAIN_PREFIX}strip)
 set(CMAKE_AR ${TOOLCHAIN_PREFIX}ar)
 
+foreach(lang ASM C CXX OBJC OBJCXX)
+    unset(CMAKE_${lang}_OSX_COMPATIBILITY_VERSION_FLAG)
+    unset(CMAKE_${lang}_OSX_CURRENT_VERSION_FLAG)
+    unset(CMAKE_${lang}_LINK_FLAGS)
+    unset(CMAKE_SHARED_LIBRARY_CREATE_${lang}_FLAGS)
+    unset(CMAKE_SHARED_MODULE_CREATE_${lang}_FLAGS)
+    unset(CMAKE_SHARED_MODULE_LOADER_${lang}_FLAG )
+    unset(CMAKE_${lang}_OSX_DEPLOYMENT_TARGET_FLAG)
+    unset(CMAKE_${lang}_SYSROOT_FLAG)
+    unset(CMAKE_SHARED_LIBRARY_SONAME_${lang}_FLAG)
+endforeach()
+
+set(CMAKE_INSTALL_NAME_TOOL "true")
+set(CMAKE_SHARED_LIBRARY_SUFFIX ".so")
+set(CMAKE_SHARED_LIBRARY_CREATE_CXX_FLAGS "-shared")
+
 #FIXME: -fstack-protector
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Os -Wno-sized-deallocation -fno-sized-deallocation -fno-exceptions -fno-rtti -Wno-address-of-packed-member -Wundef -Wcast-qual -Wwrite-strings -Wimplicit-fallthrough -Wno-nonnull-compare -Wno-deprecated-copy -Wno-expansion-to-defined")

Libraries/LibC/CMakeLists.txt

@@ -54,10 +54,15 @@ set(ELF_SOURCES ${ELF_SOURCES} ../LibELF/Arch/i386/plt_trampoline.S)
 
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DSERENITY_LIBC_BUILD")
 
+find_program(INSTALL_COMMAND ginstall)
+if(NOT INSTALL_COMMAND)
+    set(INSTALL_COMMAND install)
+endif()
+
 add_library(crt0 STATIC crt0.cpp)
 add_custom_command(
     TARGET crt0
-    COMMAND install -D $<TARGET_OBJECTS:crt0> ${CMAKE_INSTALL_PREFIX}/usr/lib/crt0.o
+    COMMAND ${INSTALL_COMMAND} -D $<TARGET_OBJECTS:crt0> ${CMAKE_INSTALL_PREFIX}/usr/lib/crt0.o
 )
 
 set(SOURCES ${LIBC_SOURCES} ${AK_SOURCES} ${ELF_SOURCES})

Toolchain/BuildIt.sh

@@ -1,6 +1,5 @@
 #!/usr/bin/env bash
 set -e
-shopt -s globstar
 # This file will need to be run in bash, for now.
 
 
@@ -24,6 +23,12 @@ NPROC="nproc"
 # It seems that Travis starts having trouble at 35 entries, so I think this is a good amount.
 KEEP_CACHE_COUNT=8
 
+if command -v ginstall &>/dev/null; then
+    INSTALL=ginstall
+else
+    INSTALL=install
+fi
+
 if [ "$(uname -s)" = "OpenBSD" ]; then
     MAKE=gmake
     MD5SUM="md5 -q"
@@ -230,11 +235,12 @@ pushd "$DIR/Build/"
         pushd "$BUILD"
             CXXFLAGS="-DBUILDING_SERENITY_TOOLCHAIN" cmake ..
             cmake --build . --target LibC
-            install -D Libraries/LibC/libc.a Libraries/LibM/libm.a Root/usr/lib/
+            "$INSTALL" -D Libraries/LibC/libc.a Libraries/LibM/libm.a Root/usr/lib/
             SRC_ROOT=$(realpath "$DIR"/..)
-            for header in "$SRC_ROOT"/Libraries/Lib{C,M}/**/*.h; do
+            FILES=$(find "$SRC_ROOT"/Libraries/LibC "$SRC_ROOT"/Libraries/LibM -name '*.h' -print)
+            for header in $FILES; do
                 target=$(echo "$header" | sed -e "s@$SRC_ROOT/Libraries/LibC@@" -e "s@$SRC_ROOT/Libraries/LibM@@")
-                install -D "$header" "Root/usr/include/$target"
+                $INSTALL -D "$header" "Root/usr/include/$target"
             done
             unset SRC_ROOT
         popd