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diff --git a/js/src/util/NativeStack.cpp b/js/src/util/NativeStack.cpp
--- a/js/src/util/NativeStack.cpp
+++ b/js/src/util/NativeStack.cpp
@@ -25,7 +25,7 @@
# include <sys/syscall.h>
# include <sys/types.h>
# include <unistd.h>
-static pid_t gettid() { return syscall(__NR_gettid); }
+# define gettid() static_cast<pid_t>(syscall(__NR_gettid))
# endif
#else
# error "Unsupported platform"
diff --git a/tools/profiler/core/platform.h b/tools/profiler/core/platform.h
--- a/tools/profiler/core/platform.h
+++ b/tools/profiler/core/platform.h
@@ -39,16 +39,16 @@
#include <functional>
#include <stdint.h>
-// We need a definition of gettid(), but glibc doesn't provide a
+// We need a definition of gettid(), but old glibc versions don't provide a
// wrapper for it.
#if defined(__GLIBC__)
# include <unistd.h>
# include <sys/syscall.h>
-static inline pid_t gettid() { return (pid_t)syscall(SYS_gettid); }
+# define gettid() static_cast<pid_t>(syscall(SYS_gettid))
#elif defined(GP_OS_darwin)
# include <unistd.h>
# include <sys/syscall.h>
-static inline pid_t gettid() { return (pid_t)syscall(SYS_thread_selfid); }
+# define gettid() static_cast<pid_t>(syscall(SYS_thread_selfid))
#elif defined(GP_OS_android)
# include <unistd.h>
#elif defined(GP_OS_windows)
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