From 3591b6d4c5f870ac7d5dd8ece3cbac3e571f9966 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marc=20Poulhi=C3=A8s?= <dkm@kataplop.net>
Date: Sun, 28 Apr 2024 18:59:17 +0200
Subject: [PATCH] Add config to build "renovated" GCC (#24)
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These branches are ""maintained"" by jwakely and can be used to build
old GCC on more recent linux distribution. They mainly contains
workarounds for glibc API change, bison version, ...

refs https://github.com/compiler-explorer/compiler-explorer/issues/6323

Signed-off-by: Marc Poulhiès <dkm@kataplop.net>
---
 build/build.sh | 28 +++++++++++++++++++++++++---
 1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/build/build.sh b/build/build.sh
index 4ae4a39..f65bd1c 100755
--- a/build/build.sh
+++ b/build/build.sh
@@ -15,7 +15,12 @@ BINUTILS_GITURL=https://sourceware.org/git/binutils-gdb.git
 BINUTILS_VERSION=2.40
 BINUTILS_REVISION=$BINUTILS_VERSION
 CONFIG=""
+
+# Defaults used for nearly every builds for recent GCC.
+BOOTSTRAP_CONFIG="--disable-bootstrap"
+INSTALL_TARGET=install-strip
 MULTILIB_ENABLED="--enable-multilib"
+WITH_ABI="--with-abi=m64"
 
 if echo "${VERSION}" | grep 'embed-trunk'; then
     VERSION=embed-trunk-$(date +%Y%m%d)
@@ -101,6 +106,24 @@ elif echo "${VERSION}" | grep 'trunk'; then
     MAJOR_MINOR=13-trunk
     LANGUAGES="${LANGUAGES},go,d,rust,m2"
     CONFIG+=" --enable-libstdcxx-backtrace=yes"
+elif echo "${VERSION}" | grep 'renovated'; then
+    SUB_VERSION=$(echo "${VERSION}" | cut -d'-' -f2)
+    URL="https://github.com/jwakely/gcc"
+    BRANCH="renovated/gcc-${SUB_VERSION}"
+    MAJOR=$(echo "${SUB_VERSION}" | cut -d'.' -f1)
+    MAJOR_MINOR=renovated-$(echo "${SUB_VERSION}" | cut -d'.' -f1-2)
+    INSTALL_TARGET=install
+    LANGUAGES="objc,c,c++"
+
+    # we need to bootstrap, as recent compiler will choke on some C++ code.
+    BOOTSTRAP_CONFIG=" "
+
+    if [[ "${MAJOR}" -le 4 ]]; then
+        WITH_ABI=" "
+        MULTILIB_ENABLED=" --disable-multilib"
+    fi
+
+    MAJOR="renovated-${MAJOR}"
 else
     MAJOR=$(echo "${VERSION}" | grep -oE '^[0-9]+')
     MAJOR_MINOR=$(echo "${VERSION}" | grep -oE '^[0-9]+\.[0-9]+')
@@ -153,7 +176,6 @@ fi
 # Workaround for Ubuntu builds
 export LIBRARY_PATH=/usr/lib/x86_64-linux-gnu
 STAGING_DIR=$(pwd)/staging
-INSTALL_TARGET=install-strip
 rm -rf "${STAGING_DIR}"
 mkdir -p "${STAGING_DIR}"
 
@@ -196,9 +218,9 @@ applyPatchesAndConfig() {
 CONFIG+=" --build=x86_64-linux-gnu"
 CONFIG+=" --host=x86_64-linux-gnu"
 CONFIG+=" --target=x86_64-linux-gnu"
-CONFIG+=" --disable-bootstrap"
+CONFIG+=" ${BOOTSTRAP_CONFIG}"
 CONFIG+=" --enable-multiarch"
-CONFIG+=" --with-abi=m64"
+CONFIG+=" ${WITH_ABI}"
 CONFIG+=" --with-multilib-list=m32,m64,mx32"
 CONFIG+=" ${MULTILIB_ENABLED}"
 CONFIG+=" --enable-clocale=gnu"