fix(configure): disable -Werror by default

Because the build system does not have direct control over the compiler,
it cannot ensure that no warnings are issued in downstream compilations.
Such warnings can occur due to newer compiler versions with more
sophisticated diagnostics, older compiler versions with diagnostics
bugs, or simply different, untested compilers. With -Werror enabled by
default, these harmless warnings result in complete compilation
failures.

The option remains enabled in CI to ensure upstream code quality.

5 files changed, 7 insertions, 3 deletions

diff --git a/.github/workflows/Test.yml b/.github/workflows/Test.yml
index 18f06619d..0ede8cee3 100644
--- a/.github/workflows/Test.yml
+++ b/.github/workflows/Test.yml
@@ -28,7 +28,7 @@ jobs:
         run: |
           docker run --rm -i -v $(pwd):/src -w /src ghdl/debug:base <<'EOF'
           #!/usr/bin/env sh
-          ./configure && make && make install
+          ./configure --enable-werror && make && make install
           gnatdoc -P./ghdl
           EOF
 
@@ -53,7 +53,7 @@ jobs:
           docker build -t ghdl/doc . -f- <<-EOF
           FROM ghdl/build:doc
           COPY . /opt/ghdl
-          RUN cd /opt/ghdl && ./configure && make && make install
+          RUN cd /opt/ghdl && ./configure --enable-werror && make && make install
           EOF
 
       - name: '📥 Download artifact: gnatdoc'
diff --git a/configure b/configure
index 49edf2f7d..715027445 100755
--- a/configure
+++ b/configure
@@ -42,7 +42,7 @@ backtrace_lib=
 llvm_be=llvm6
 build=
 build_mode=
-enable_werror=true
+enable_werror=false
 enable_checks=true
 enable_gplcompat=unknown
 enable_libghdl=true
diff --git a/scripts/ci-run.sh b/scripts/ci-run.sh
index 368224085..ecfd6e358 100755
--- a/scripts/ci-run.sh
+++ b/scripts/ci-run.sh
@@ -202,6 +202,8 @@ build () {
   mkdir "build-$BACK"
   cd "build-$BACK"
 
+  CONFIG_OPTS+=" --enable-werror"
+
   if [ "x$ISSYNTH" = "xfalse" ]; then
     CONFIG_OPTS+=" --disable-synth"
   fi
diff --git a/scripts/msys2-llvm/PKGBUILD b/scripts/msys2-llvm/PKGBUILD
index 0c7848209..91aba6f59 100644
--- a/scripts/msys2-llvm/PKGBUILD
+++ b/scripts/msys2-llvm/PKGBUILD
@@ -28,6 +28,7 @@ build() {
     --prefix=${MINGW_PREFIX} \
     --with-llvm-config="llvm-config --link-static" \
     LDFLAGS="-static" \
+    --enable-werror \
     --enable-libghdl \
     --enable-synth
   make GNATMAKE="gnatmake -j$(nproc)"
diff --git a/scripts/msys2-mcode/PKGBUILD b/scripts/msys2-mcode/PKGBUILD
index 7c77fbf75..1e01fa613 100644
--- a/scripts/msys2-mcode/PKGBUILD
+++ b/scripts/msys2-mcode/PKGBUILD
@@ -24,6 +24,7 @@ build() {
   ../../../../configure \
     --prefix=${MINGW_PREFIX} \
     LDFLAGS="-static -Wl,--stack=8388608" \
+    --enable-werror \
     --enable-libghdl \
     --enable-synth
   make GNATMAKE="gnatmake -j$(nproc)"