Update GCC version to 10 (#1132)

In 0.9.36, there was a missing symbol that caused
```
libskiko-linux-x64.so: undefined symbol: _ZNSt19_Sp_make_shared_tag5_S_eqERKSt9type_info
```

It's because the build attempts to statically link the C++ standard
library, but:
- Skia's object files reference newer libstdc++ symbols
- GCC 7.3's `libstdc++` doesn't contain these symbols
- The static linking fails to resolve these symbols

GCC was downgraded from 9 to 7 in #1130 during the switch to AL2 to
provide better GLIBC compatibility.
Since AL2
[provides](https://docs.aws.amazon.com/linux/al2/ug/c-cplusplus.html)
only GCC 7.3 by default and GCC 10, installing GCC 9 is problematic
there, so it's bumped to 10

However, GCC 10 introduces outline atomics as default for new ARM chips,
the build might fail due to missing symbols like
```
org_jetbrains_skia_FontMgrWithFallback__1nDefaultWithFallbackFontProvider: error: undefined reference to '__aarch64_ldadd4_relax'
org_jetbrains_skia_FontMgrWithFallback__1nDefaultWithFallbackFontProvider: error: undefined reference to '__aarch64_ldadd4_acq_rel'
```
so, to keep things compatible with the previous GCC version,
`-mno-outline-atomics` option was added to disable this new behavior.

skiko/buildSrc/src/main/kotlin/tasks/configuration/JvmTasksConfiguration.kt

@@ -85,6 +85,10 @@ fun SkikoProjectContext.createCompileJvmBindingsTask(
         OS.Linux -> {
             includeHeadersNonRecursive(jdkHome.resolve("include/linux"))
             includeHeadersNonRecursive(runPkgConfig("dbus-1"))
+            val archFlags = if (targetArch == Arch.Arm64) arrayOf(
+                // Always inline atomics for ARM64 to prevent linking incompatibility issues after updating GCC to 10
+                "-mno-outline-atomics",
+            ) else arrayOf()
             osFlags = arrayOf(
                 *buildType.clangFlags,
                 "-DGL_GLEXT_PROTOTYPES",
@@ -92,7 +96,8 @@ fun SkikoProjectContext.createCompileJvmBindingsTask(
                 "-fno-rtti",
                 "-fno-exceptions",
                 "-fvisibility=hidden",
-                "-fvisibility-inlines-hidden"
+                "-fvisibility-inlines-hidden",
+                *archFlags,
             )
         }
         OS.Windows -> {

skiko/buildSrc/src/main/kotlin/tasks/configuration/NativeTasksConfiguration.kt

@@ -127,6 +127,10 @@ fun SkikoProjectContext.compileNativeBridgesTask(
                 ))
             }
             OS.Linux -> {
+                val archFlags = if (arch == Arch.Arm64) arrayOf(
+                    // Always inline atomics for ARM64 to prevent linking incompatibility issues after updating GCC to 10
+                    "-mno-outline-atomics",
+                ) else arrayOf()
                 val linuxFlags = mutableListOf(
                     *buildType.clangFlags,
                     "-fPIC",
@@ -134,6 +138,7 @@ fun SkikoProjectContext.compileNativeBridgesTask(
                     "-fno-exceptions",
                     "-fvisibility=hidden",
                     "-fvisibility-inlines-hidden",
+                    *archFlags,
                     *skiaPreprocessorFlags(OS.Linux, buildType)
                 )
                 // Add sysroot for ARM64 cross-compilation

skiko/docker/linux-amd64/Dockerfile

@@ -6,6 +6,9 @@ RUN apt update -y && \
     apt install zip unzip git python curl wget xvfb -y && \
     apt install fontconfig libfontconfig1-dev libglu1-mesa-dev libxrandr-dev libdbus-1-dev -y && \
     apt install openjdk-21-jdk -y && \
+    apt install gcc-10 g++-10 -y && \
+    update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 60 --slave /usr/bin/g++ g++ /usr/bin/g++-10 && \
+    update-alternatives --config gcc && \
     rm -rf /var/lib/apt/lists/*
 
 # Install chromium tools
@@ -29,7 +32,7 @@ RUN dpkg --add-architecture arm64 && echo \
     rm -rf /var/lib/apt/lists/*
 
 # Install cross-compilation toolchain for ARM64
-ENV ARM_TOOLCHAIN_VERSION=9.2-2019.12
+ENV ARM_TOOLCHAIN_VERSION=10.3-2021.07
 ENV ARM_TOOLCHAIN_NAME=gcc-arm-${ARM_TOOLCHAIN_VERSION}-x86_64-aarch64-none-linux-gnu
 ENV ARM_TOOLCHAIN_PATH=/opt/arm-gnu-toolchain
 ENV ARM_TOOLCHAIN_SYSROOT=$ARM_TOOLCHAIN_PATH/aarch64-none-linux-gnu/libc

skiko/docker/linux-compat/Dockerfile

@@ -6,7 +6,10 @@ ARG TARGETARCH
 
 # Install basic & development tools
 RUN yum install -y tar xz git wget curl zip gzip && \
-    yum install -y gcc gcc-c++ binutils make && \
+    yum install -y gcc10 gcc10-c++ gcc10-binutils make && \
+    ln -sf /usr/bin/gcc10-gcc /usr/bin/gcc && \
+    ln -sf /usr/bin/gcc10-g++ /usr/bin/g++ && \
+    ln -sf /usr/bin/gcc10-ar /usr/bin/ar && \
     yum clean all
 
 # Install libraries
@@ -37,7 +40,7 @@ ENV PATH=$DEPOT_TOOLS:$PATH
 RUN git clone 'https://chromium.googlesource.com/chromium/tools/depot_tools.git' $DEPOT_TOOLS
 
 # Install cross-compilation toolchain for ARM64
-ENV ARM_TOOLCHAIN_VERSION=9.2-2019.12
+ENV ARM_TOOLCHAIN_VERSION=10.3-2021.07
 ENV ARM_TOOLCHAIN_NAME=gcc-arm-${ARM_TOOLCHAIN_VERSION}-x86_64-aarch64-none-linux-gnu
 ENV ARM_TOOLCHAIN_PATH=/opt/arm-gnu-toolchain
 ENV PATH="/usr/local/bin:$ARM_TOOLCHAIN_PATH/bin:$PATH"