From: Rich Felker <dalias@aerifal.cx>
Date: Mon, 9 Apr 2012 19:06:58 +0000 (-0400)
Subject: alloca cannot be a function. #define it to the gcc builtin if possible
X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=commitdiff_plain;h=d71d0805f9ad4010529bb94092a2e378b4edac9a;hp=5bd0ab8af66829af74ed80cac767ce1c041fd767

alloca cannot be a function. #define it to the gcc builtin if possible

gcc makes this mapping by default anyway, but it will be disabled by
-fno-builtin (and presumably by -std=c99 or similar). for the main
program the error will be reported by the linker, and the issue can
easily be fixed, but for dynamic-loaded so files, the error cannot be
detected until dlopen time, at which point it has become very obscure.
---

diff --git a/include/alloca.h b/include/alloca.h
index f61b817a..d2e6f1c6 100644
--- a/include/alloca.h
+++ b/include/alloca.h
@@ -10,6 +10,10 @@ extern "C" {
 
 void *alloca(size_t);
 
+#ifdef __GNUC__
+#define alloca __builtin_alloca
+#endif
+
 #ifdef __cplusplus
 }
 #endif