[Openmp-commits] [PATCH] D98565: [libomptarget][amdgcn] Drop use of inttypes.h, moving closer to freestanding

Jon Chesterfield via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Fri Mar 12 15:47:31 PST 2021

JonChesterfield created this revision.
JonChesterfield added reviewers: jdoerfert, tianshilei1992, grokos, ronlieb.
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[libomptarget][amdgcn] Drop use of inttypes.h, moving closer to freestanding

The glibc headers are a periodic source of problems compiling the devicertl.
This patch resolves the following error run into while building llvm on a slightly
different linux system.

In file included from .../lib/clang/13.0.0/include/inttypes.h:21:
In file included from /usr/include/inttypes.h:25:
/usr/include/features.h:461:12: fatal error: 'sys/cdefs.h' file not found

include <sys/cdefs.h>


As a second patch, removing assert.h from shuffle will let amdgcn build as
-ffreestanding, at which point only the headers that clang itself provides are
used and interactions with the host glibc are eliminated. Doing the same for
nvptx is complicated by printf handling but also seems worthwhile.

  rG LLVM Github Monorepo



Index: openmp/libomptarget/deviceRTLs/common/include/target/shuffle.h
--- openmp/libomptarget/deviceRTLs/common/include/target/shuffle.h
+++ openmp/libomptarget/deviceRTLs/common/include/target/shuffle.h
@@ -16,7 +16,7 @@
 #include <assert.h>
-#include <inttypes.h>
+#include <stdint.h>
 #pragma omp declare target
Index: openmp/libomptarget/deviceRTLs/amdgcn/src/target_impl.h
--- openmp/libomptarget/deviceRTLs/amdgcn/src/target_impl.h
+++ openmp/libomptarget/deviceRTLs/amdgcn/src/target_impl.h
@@ -18,10 +18,13 @@
 #include "amdgcn_interface.h"
-#include <inttypes.h>
 #include <stddef.h>
 #include <stdint.h>
+// subset of inttypes.h
+#define PRId64 "ld"
+#define PRIu64 "lu"
 #define DEVICE
 #define INLINE inline DEVICE
 #define NOINLINE __attribute__((noinline)) DEVICE

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