[sysprof] macros: add static assert helper

[Christian Hergert <chergert src gnome org>]

commit 57183ab8e24126baca5451c4140f0551f932d2bd
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jul 4 16:11:31 2020 -0700

    macros: add static assert helper
    
    So that we can use this from gnu99 such as from GTK.

 src/libsysprof-capture/mapped-ring-buffer.c    |  2 +-
 src/libsysprof-capture/sysprof-address.h       |  4 +--
 src/libsysprof-capture/sysprof-capture-types.h | 45 +++++++++++++-------------
 src/libsysprof-capture/sysprof-macros.h        |  6 ++++
 4 files changed, 31 insertions(+), 26 deletions(-)
---
diff --git a/src/libsysprof-capture/mapped-ring-buffer.c b/src/libsysprof-capture/mapped-ring-buffer.c
index b7b5679..c7f2ce2 100644
--- a/src/libsysprof-capture/mapped-ring-buffer.c
+++ b/src/libsysprof-capture/mapped-ring-buffer.c
@@ -55,7 +55,7 @@ typedef struct _MappedRingHeader
   uint32_t size;
 } MappedRingHeader;
 
-static_assert (sizeof (MappedRingHeader) == 16, "MappedRingHeader changed size");
+SYSPROF_STATIC_ASSERT (sizeof (MappedRingHeader) == 16, "MappedRingHeader changed size");
 
 /*
  * MappedRingBuffer is used to wrap both the reader and writer
diff --git a/src/libsysprof-capture/sysprof-address.h b/src/libsysprof-capture/sysprof-address.h
index 098bcc3..29ad0d4 100644
--- a/src/libsysprof-capture/sysprof-address.h
+++ b/src/libsysprof-capture/sysprof-address.h
@@ -67,8 +67,8 @@ SYSPROF_BEGIN_DECLS
 
 typedef uint64_t SysprofAddress;
 
-static_assert (sizeof (SysprofAddress) >= sizeof (void *),
-               "Address space is too big");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofAddress) >= sizeof (void *),
+                       "Address space is too big");
 
 typedef enum
 {
diff --git a/src/libsysprof-capture/sysprof-capture-types.h b/src/libsysprof-capture/sysprof-capture-types.h
index 2031fc7..eaba446 100644
--- a/src/libsysprof-capture/sysprof-capture-types.h
+++ b/src/libsysprof-capture/sysprof-capture-types.h
@@ -80,8 +80,7 @@ SYSPROF_BEGIN_DECLS
 
 #define SYSPROF_CAPTURE_ADDRESS_FORMAT "0x%016" PRIx64
 
-static_assert (sizeof (void *) == sizeof (uintptr_t),
-               "UINTPTR_MAX can’t be used to determine sizeof(void*) at compile time");
+SYSPROF_STATIC_ASSERT (sizeof (void *) == sizeof (uintptr_t), "UINTPTR_MAX can’t be used to determine 
sizeof(void*) at compile time");
 #if UINTPTR_MAX == 0xFFFFFFFFFFFFFFFFu
 # define SYSPROF_CAPTURE_JITMAP_MARK    SYSPROF_UINT64_CONSTANT(0xE000000000000000)
 #elif UINTPTR_MAX == 0xFFFFFFFF
@@ -335,27 +334,27 @@ typedef struct
 } SysprofCaptureAllocation
 SYSPROF_ALIGNED_END(1);
 
-static_assert (sizeof (SysprofCaptureFileHeader) == 256, "SysprofCaptureFileHeader changed size");
-static_assert (sizeof (SysprofCaptureFrame) == 24, "SysprofCaptureFrame changed size");
-static_assert (sizeof (SysprofCaptureMap) == 56, "SysprofCaptureMap changed size");
-static_assert (sizeof (SysprofCaptureJitmap) == 28, "SysprofCaptureJitmap changed size");
-static_assert (sizeof (SysprofCaptureProcess) == 24, "SysprofCaptureProcess changed size");
-static_assert (sizeof (SysprofCaptureSample) == 32, "SysprofCaptureSample changed size");
-static_assert (sizeof (SysprofCaptureFork) == 28, "SysprofCaptureFork changed size");
-static_assert (sizeof (SysprofCaptureExit) == 24, "SysprofCaptureExit changed size");
-static_assert (sizeof (SysprofCaptureTimestamp) == 24, "SysprofCaptureTimestamp changed size");
-static_assert (sizeof (SysprofCaptureCounter) == 128, "SysprofCaptureCounter changed size");
-static_assert (sizeof (SysprofCaptureCounterValues) == 96, "SysprofCaptureCounterValues changed size");
-static_assert (sizeof (SysprofCaptureCounterDefine) == 32, "SysprofCaptureCounterDefine changed size");
-static_assert (sizeof (SysprofCaptureCounterSet) == 32, "SysprofCaptureCounterSet changed size");
-static_assert (sizeof (SysprofCaptureMark) == 96, "SysprofCaptureMark changed size");
-static_assert (sizeof (SysprofCaptureMetadata) == 64, "SysprofCaptureMetadata changed size");
-static_assert (sizeof (SysprofCaptureLog) == 64, "SysprofCaptureLog changed size");
-static_assert (sizeof (SysprofCaptureFileChunk) == 284, "SysprofCaptureFileChunk changed size");
-static_assert (sizeof (SysprofCaptureAllocation) == 48, "SysprofCaptureAllocation changed size");
-
-static_assert ((offsetof (SysprofCaptureAllocation, addrs) % SYSPROF_CAPTURE_ALIGN) == 0, 
"SysprofCaptureAllocation.addrs is not aligned");
-static_assert ((offsetof (SysprofCaptureSample, addrs) % SYSPROF_CAPTURE_ALIGN) == 0, 
"SysprofCaptureSample.addrs is not aligned");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureFileHeader) == 256, "SysprofCaptureFileHeader changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureFrame) == 24, "SysprofCaptureFrame changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureMap) == 56, "SysprofCaptureMap changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureJitmap) == 28, "SysprofCaptureJitmap changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureProcess) == 24, "SysprofCaptureProcess changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureSample) == 32, "SysprofCaptureSample changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureFork) == 28, "SysprofCaptureFork changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureExit) == 24, "SysprofCaptureExit changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureTimestamp) == 24, "SysprofCaptureTimestamp changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureCounter) == 128, "SysprofCaptureCounter changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureCounterValues) == 96, "SysprofCaptureCounterValues changed 
size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureCounterDefine) == 32, "SysprofCaptureCounterDefine changed 
size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureCounterSet) == 32, "SysprofCaptureCounterSet changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureMark) == 96, "SysprofCaptureMark changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureMetadata) == 64, "SysprofCaptureMetadata changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureLog) == 64, "SysprofCaptureLog changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureFileChunk) == 284, "SysprofCaptureFileChunk changed size");
+SYSPROF_STATIC_ASSERT (sizeof (SysprofCaptureAllocation) == 48, "SysprofCaptureAllocation changed size");
+
+SYSPROF_STATIC_ASSERT ((offsetof (SysprofCaptureAllocation, addrs) % SYSPROF_CAPTURE_ALIGN) == 0, 
"SysprofCaptureAllocation.addrs is not aligned");
+SYSPROF_STATIC_ASSERT ((offsetof (SysprofCaptureSample, addrs) % SYSPROF_CAPTURE_ALIGN) == 0, 
"SysprofCaptureSample.addrs is not aligned");
 
 static inline int
 sysprof_capture_address_compare (SysprofCaptureAddress a,
diff --git a/src/libsysprof-capture/sysprof-macros.h b/src/libsysprof-capture/sysprof-macros.h
index f025458..218414c 100644
--- a/src/libsysprof-capture/sysprof-macros.h
+++ b/src/libsysprof-capture/sysprof-macros.h
@@ -70,6 +70,12 @@
 #define SYSPROF_GNUC_CHECK_VERSION(major, minor) 0
 #endif
 
+#if SYSPROF_GNUC_CHECK_VERSION(4, 6)
+# define SYSPROF_STATIC_ASSERT(expr, msg) _Static_assert(expr, msg)
+#else
+# define SYSPROF_STATIC_ASSERT(expr, msg) ((void) sizeof (char[(expr) ? 1 : -1]))
+#endif
+
 #if INT_MAX == LONG_MAX
 #define SYSPROF_INT64_CONSTANT(x) x##ULL
 #define SYSPROF_UINT64_CONSTANT(x) x##LL