From cb06688c9e48539947d47e3cade923bff0bbd825 Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Sat, 30 May 2026 13:57:22 +0300
Subject: [PATCH] builder: detect resolved tcc path in parallel cc

---
 vlib/v/builder/cbuilder/parallel_cc.v      | 11 ++++++++++-
 vlib/v/builder/cbuilder/parallel_cc_test.v |  9 +++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 vlib/v/builder/cbuilder/parallel_cc_test.v

diff --git a/vlib/v/builder/cbuilder/parallel_cc.v b/vlib/v/builder/cbuilder/parallel_cc.v
index 36ab7d675..8fb105fee 100644
--- a/vlib/v/builder/cbuilder/parallel_cc.v
+++ b/vlib/v/builder/cbuilder/parallel_cc.v
@@ -19,6 +19,15 @@ fn parallel_cc_compiler_path(b &builder.Builder) string {
 	return cc_compiler
 }
 
+fn parallel_cc_uses_tcc(cc_kind builder.CC, ccompiler string) bool {
+	if cc_kind == .tcc {
+		return true
+	}
+	normalized := ccompiler.replace('\\', '/').to_lower()
+	return normalized == 'tcc' || normalized.ends_with('/tcc') || normalized.ends_with('/tcc.exe')
+		|| normalized.contains('/thirdparty/tcc/')
+}
+
 fn parallel_cc(mut b builder.Builder, result c.GenOutput) ! {
 	tmp_dir := os.vtmp_dir()
 	sw_total := time.new_stopwatch()
@@ -79,7 +88,7 @@ fn parallel_cc(mut b builder.Builder, result c.GenOutput) ! {
 	cc := b.quote_compiler_name(parallel_cc_compiler_path(b))
 	mut compile_args := b.get_compile_args()
 	mut linker_args := b.get_linker_args()
-	if b.ccoptions.cc == .tcc {
+	if parallel_cc_uses_tcc(b.ccoptions.cc, parallel_cc_compiler_path(b)) {
 		// vlang/tcc can have its runtime objects under `${vroot}/thirdparty/tcc/lib/tcc/`
 		// or directly under `${vroot}/thirdparty/tcc/lib/`, while its system headers
 		// can be under that install dir or `${vroot}/thirdparty/tcc/include/`.
diff --git a/vlib/v/builder/cbuilder/parallel_cc_test.v b/vlib/v/builder/cbuilder/parallel_cc_test.v
new file mode 100644
index 000000000..290ea6e9b
--- /dev/null
+++ b/vlib/v/builder/cbuilder/parallel_cc_test.v
@@ -0,0 +1,9 @@
+module cbuilder
+
+fn test_parallel_cc_uses_tcc_for_resolved_compiler_paths() {
+	assert parallel_cc_uses_tcc(.tcc, 'cc')
+	assert parallel_cc_uses_tcc(.unknown, 'tcc')
+	assert parallel_cc_uses_tcc(.unknown, '/tmp/v/thirdparty/tcc/tcc')
+	assert parallel_cc_uses_tcc(.unknown, 'D:\\a\\v\\v\\thirdparty\\tcc\\tcc.exe')
+	assert !parallel_cc_uses_tcc(.unknown, '/usr/bin/clang')
+}
-- 
2.39.5