fixes for thin lto

src/SPC/builder/unix/library/ncurses.php

@@ -10,13 +10,26 @@ use SPC\util\SPCTarget;
 
 trait ncurses
 {
+    public function patchBeforeBuild(): bool
+    {
+        // MKlib_gen.sh feeds preprocessor stdout through a sed/awk pipeline into lib_gen.c.
+        // zig-cc/clang leaks the "N warning(s) generated." summary onto stdout (not stderr),
+        // and that line ends up as invalid C in the generated source. Filter it out of the pipe.
+        FileSystem::replaceFileStr(
+            $this->source_dir . '/ncurses/base/MKlib_gen.sh',
+            '$preprocessor $TMP 2>/dev/null \\',
+            "\$preprocessor \$TMP 2>/dev/null \\\n| grep -v ' generated\\.\$' \\",
+        );
+        return true;
+    }
+
     protected function build(): void
     {
         $filelist = FileSystem::scanDirFiles(BUILD_BIN_PATH, relative: true);
 
         UnixAutoconfExecutor::create($this)
             ->appendEnv([
-                'CFLAGS' => '-std=c17',
+                'CFLAGS' => '-std=c17 -w',
                 'LDFLAGS' => SPCTarget::isStatic() ? '-static' : '',
             ])
             ->configure(

src/SPC/builder/unix/library/unixodbc.php

@@ -21,6 +21,14 @@ trait unixodbc
             'Linux' => '/etc',
             default => throw new WrongUsageException('Unsupported OS: ' . PHP_OS_FAMILY),
         };
+        // libltdl is incompatible with -flto (https://bugs.gentoo.org/532672)
+        $stripLto = static fn ($s) => preg_replace('/(^|\s)-flto(=\S+)?(?=\s|$)/', ' ', (string) $s);
+        $origC = $this->builder->arch_c_flags;
+        $origCxx = $this->builder->arch_cxx_flags;
+        $origLd = $this->builder->arch_ld_flags;
+        $this->builder->arch_c_flags = clean_spaces($stripLto($origC));
+        $this->builder->arch_cxx_flags = clean_spaces($stripLto($origCxx));
+        $this->builder->arch_ld_flags = clean_spaces($stripLto($origLd));
         $make = UnixAutoconfExecutor::create($this)
             ->configure(
                 '--disable-debug',
@@ -37,6 +45,10 @@ trait unixodbc
         );
 
         $make->make();
+        $this->builder->arch_c_flags = $origC;
+        $this->builder->arch_cxx_flags = $origCxx;
+        $this->builder->arch_ld_flags = $origLd;
+
         $pkgConfigs = ['odbc.pc', 'odbccr.pc', 'odbcinst.pc'];
         $this->patchPkgconfPrefix($pkgConfigs);
         foreach ($pkgConfigs as $file) {