correctly find getpc.h header for GetPC configure test
When building out-of-tree include of src/getpc.h fails, so we
decide incorrectly that GetPC isn't functional.
Fixes github issue #1525
diff --git a/configure.ac b/configure.ac
index f5a0ebd..a2b8588 100644
--- a/configure.ac
+++ b/configure.ac
@@ -315,10 +315,13 @@
# we're dealing with unknown system, we have to check if GetPC
# actually works. But don't bother if we're not doing cpu-profiling.
if test "$enable_cpu_profiler" = yes; then
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "src/getpc.h"]], [GetPC({})])],
+ OLD_CXXFLAGS="$CXXFLAGS"
+ CXXFLAGS="$CXXFLAGS -I$srcdir/src"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include "getpc.h"]], [GetPC({})])],
[],
[AC_MSG_WARN(Could not find the PC. Will not try to compile libprofiler...)
enable_cpu_profiler=no])
+ CXXFLAGS="$OLD_CXXFLAGS"
fi
# Some tests test the behavior of .so files, and only make sense for dynamic.
