Fix building DynamicLibrary.cpp with musl libc
Summary:
The workaround added in rL301240 for stderr/out/in symbols being both
macros and globals is only necessary for glibc, and it does not compile
with musl libc. Alpine Linux has had the following fix for it:
https://git.alpinelinux.org/cgit/aports/plain/main/llvm4/llvm-fix-DynamicLibrary-to-build-with-musl-libc.patch
Adapt the fix in our DynamicLibrary.inc for Unix.
Reviewers: marsupial, chandlerc, krytarowski
Reviewed By: krytarowski
Subscribers: srhines, krytarowski, llvm-commits
Differential Revision: https://reviews.llvm.org/D33883
llvm-svn: 304707
diff --git a/llvm/lib/Support/Unix/DynamicLibrary.inc b/llvm/lib/Support/Unix/DynamicLibrary.inc
index a0526fa..30972ff 100644
--- a/llvm/lib/Support/Unix/DynamicLibrary.inc
+++ b/llvm/lib/Support/Unix/DynamicLibrary.inc
@@ -101,10 +101,10 @@
#define EXPLICIT_SYMBOL(SYM) \
if (!strcmp(SymbolName, #SYM)) return &SYM
-// On linux we have a weird situation. The stderr/out/in symbols are both
+// Under glibc we have a weird situation. The stderr/out/in symbols are both
// macros and global variables because of standards requirements. So, we
// boldly use the EXPLICIT_SYMBOL macro without checking for a #define first.
-#if defined(__linux__) and !defined(__ANDROID__)
+#if defined(__GLIBC__)
{
EXPLICIT_SYMBOL(stderr);
EXPLICIT_SYMBOL(stdout);